Abstract: The present invention relates to a working machine having an engine room and a housing, wherein the housing at least partially surrounds or can surround the engine room, wherein a venting space, in which a line mouth of a line ends, is arranged on the housing, wherein the venting space is delimited from the engine room, preferably delimited in a gas-tight manner, and wherein the venting space is formed by a partial region of the housing and a bottom piece arranged in the engine room.

Abstract: A reservoir for a vehicle is provided. The reservoir is accommodated in a body formed by joining an upper case and a lower case to each other. A high-pressure reservoir space introduces and discharges coolant flowing from a high pressure cooling line and a low-pressure reservoir space introduces and discharges coolant flowing from a low pressure cooling line. A valve is also installed to maintain internal pressure of the high-pressure reservoir space and the low-pressure reservoir space constant.

Abstract: An expansion tank, includes: a tank main body defining a storage chamber storing a coolant liquid therein; multiple partition walls provided in the tank main body to divide the storage chamber into multiple division chambers including an inlet chamber and an outlet chamber, the partition walls being formed with communication holes for bringing adjacent ones of the division chambers into communication with each other; a coolant liquid inlet portion that is provided on the tank main body and is open to the inlet chamber; a coolant liquid outlet portion that has an outlet opening in a depression formed in a bottom of the tank main body and is open to the outlet chamber; and a barrier wall extending from a side wall of the tank main body or one of the partition walls into the depression.

Abstract: A vehicle cooling system includes a first cooling circuit having a first operating temperature range when the vehicle is in an operational state, a second cooling circuit having a second operating temperature range, and a degas bottle. The degas bottle has a first chamber operably coupled to the first cooling circuit and a second chamber operably coupled to the second cooling circuit. The degas bottle includes a first chamber operably coupled to the first cooling circuit, a second chamber operably coupled to the second cooling circuit, and a third chamber configured as a common filling chamber for the first and second chambers. The first chamber is operably coupled to the third chamber via a first filling gate, and the second chamber is operably coupled to the third chamber via a second filling gate. The first and second filling gates are configured for simultaneous opening during a fill operation in which cooling fluid is provided into the third chamber to fill the first and second chambers.

Abstract: A vehicle cooling system includes a first cooling circuit having a first operating temperature range when the vehicle is in an operational state, a second cooling circuit having a second operating temperature range, and a degas bottle. The degas bottle has a first chamber operably coupled to the first cooling circuit and a second chamber operably coupled to the second cooling circuit. The degas bottle includes a fill port operably coupled to the second chamber and a flow restrictor disposed at a divider separating the first and second chambers. The flow restrictor is configured to open to enable cooling fluid provided via the fill port, when the vehicle is in a non-operational state, to flow from the second chamber to the first chamber and be closed when the vehicle is in the operational state to prevent the cooling fluid from flowing between the first and second chambers.

Abstract: A self-cooling electric submersible pump having an integrated cooling system is provided. The cooling system is configured to cool and lubricate the electric motor section of the pump by expanding a compressed multi-component coolant fluid through flow channels within the motor. The coolant fluid contains a first fluid having a boiling point of at least 230° C. and a second fluid having a boiling point of less than 150° C. During pump operation the first fluid acts as a largely incompressible liquid and the second fluid behaves as a compressible gas. A compressor compresses the second fluid in the presence of the first fluid to produce a hot compressed coolant fluid from which heat is transferred to a production fluid being processed by the pump. The compressed coolant fluid is expanded through an orifice and into the motor flow channels, returning thereafter to the compressor.

Abstract: The present invention relates to a liquid-cooled internal combustion engine comprising an engine block, which includes a plurality of cylinders, and cylinder heads closing the cylinders, wherein each cylinder is surrounded by a respective cooling liner and each cylinder head has provided therein at least one separate cooling chamber connected to the cooling liner of the associated cylinder via at least one transition channel, wherein the transition channels of at least two cylinders are interconnected via a pressure compensation chamber.

Abstract: An outboard motor includes an engine, a fan driven by the engine to discharge air surrounding the engine, and a cowl housing the engine and the fan. The cowl includes a top cowl that is disposed above the engine and includes an exhaust pathway for exhaust to flow from the fan, and an exhaust port connected to the exhaust pathway and located on the top cowl. The exhaust port opens in a forward direction of the outboard motor.

Abstract: A construction machine includes a cooling fan (10) and a shroud (11). The cooling fan (10) sends air drawn in via a radiator (30) to an engine. The shroud (11) is disposed on an outer peripheral side of the cooling fan and forms a passage for air to be drawn in via the radiator. The construction machine includes a tank (12) and a cover (14B). The tank (12) is disposed superior to an upper end portion of the radiator and stores cooling water to be supplied to the radiator and the engine. The cover (14B) is disposed openably in an opening (14A) formed in a top surface plate (11B) of the shroud. The tank (12) is disposed at a position adjacent to the shroud (11) on a side closer to the engine side than the cover (14B) is.

Abstract: An adapter for an engine cooling system is provided. The adapter, includes a main pipe, having a first end coupled to a first degassing line connected to a high-temperature component, and a second end of coupled to a second degassing line connected to a reservoir tank. A branch pipe is branched from one side of the main pipe to be coupled to a third degassing line connected to the low-temperature component. An inner pipe is disposed at an interior circumference of the main pipe and has a diameter that is gradually reduced toward the reservoir tank.

Abstract: A radiator for a vehicle includes a built-in oil cooler tank. The radiator includes two header tanks and a core member disposed between the header tanks. One of the header tanks includes a support member disposed along an inner surface of the header tank and further defines an aperture. The oil cooler tank includes two ports and a core portion extending between the ports. Each of the ports has a rim and defines a bore. The rim of a given port is disposed within a given support member such that the bore of the given port aligns with a given aperture of the header tank.

Abstract: A coolant circulation system for turbochargers is provided. The coolant circulation system includes a turbocharger provided with a coolant outlet line and a coolant inlet line. The coolant is discharged from the turbocharger through the coolant outlet line. The coolant outlet line is connected to a first flow path connecting an inlet port of a radiator to an outlet port of a heater core. The coolant is supplied into the turbocharger through the coolant inlet line. The coolant inlet line is connected to a second flow path connecting a first end of a water pump to an inlet port of the heater core.

Abstract: A method for an engine is presented, wherein during a first condition, pressurized gas from an engine coolant degas bottle to an ejector positioned in a vent line coupled to a fuel vapor canister; and the contents of the fuel vapor canister are purged to an engine intake. The ejector may draw atmospheric air into the fuel vapor canister, thus enabling purging of the fuel vapor canister even when an engine intake vacuum is below a threshold. In this way, boosted engines and other engines configured to operate with reduced intake vacuum may execute canister purging events that are independent of engine intake pressure.

Abstract: A pressurized coolant reservoir tank assembly may include a tank having an injection port formed at an upper portion thereof, storing coolant for cooling an engine of a vehicle therein, and having a discharge hole formed to penetrate a side surface of the injection port such that steam or coolant is discharged to an outside through the discharge hole, a pressure cap fastened to the injection port such that the discharge hole is opened when the pressure in the tank reaches a predetermined pressure or the pressure cap begins to be rotated, and a burn prevention cover fitted to an outer surface of the tank with a gap between a bottom surface of the burn prevention cover and a surface of the tank such that the steam or coolant discharged through the discharge hole flows downward of the tank along the surface of the tank.

Abstract: A ventilation system for use in a vehicle that provides individual control of micro-zones in the vehicle and the system includes a blower for pushing air through the ventilation system, an evaporator for conditioning the air being pushed by the blower, a first duct for supplying air to a first micro-zone and a second duct for supplying air to a second micro-zone, the second duct partitioned form the first duct, the first and second ducts receiving air once it has been blown through the evaporator and a flow diverter for selectively opening the partition wall and connecting the first duct and second duct so that air continues to flow through the evaporator even when one microzone is completely closed and no air flows through the related duct.

Abstract: A coolant reservoir includes a body portion defining an interior cavity configured to hold a coolant; and a barrier wall positioned within the body portion to partition the interior cavity into an upper chamber and a lower chamber, the barrier wall defining an opening therethrough that allows fluid communication between the lower chamber and the upper chamber.

Abstract: Expansion reservoir (1) for a coolant circuit, having a fill opening (3) that can be closed by a lid (2) and is located in the geodetically upper region of the expansion reservoir (1), wherein a differential-pressure-controlled valve (4) having at least two switching positions is integrated into the lid (2), and having at least one inlet port (5) which opens into a lid region (10), and an outlet port (6) in the geodetically lower region of the expansion reservoir (1), wherein the inlet port (5) is closed by the valve (4) in a first switching position and is opened in at least one second switching position, thus allowing the inlet port (5) to vent into the expansion reservoir (1).

Abstract: A closure lid for an expansion tank of a cooling system of an internal combustion engine has integrated therein a directional control valve that decouples the expansion tank from the cooling circuit by pressure control or temperature control and integrates the expansion tank again into the cooling circuit after the internal combustion engine has reached its operating temperature.

Abstract: A cooling arrangement for an internal combustion engine is described, with a coolant balancing tank which is capable of being filled with coolant and the inlet side of which is connected via a first venting line to an internal combustion engine and/or via a second venting line to a cooler for cooling the coolant, and the outlet side of which is connected via a coolant return line to the inlet side of a pumping device for pumping the coolant through the internal combustion engine. The cooling arrangement has, furthermore, a flow control unit for variably limiting the coolant volume flow in the venting line.

Abstract: A cylinder cooling apparatus for an air-cooled engine is equipped with a cooling fan provided on one end section of a crankshaft; a pair of pushrod insertion holes for air intake and exhaust valves formed in a cylinder outer circumferential wall section; a fan shroud for covering the cooling fan and for covering the cylinder outer circumferential wall section in which the pushrod insertion holes are formed; a cutout ventilating section formed in the cylinder outer circumferential wall section between the pair of pushrod insertion holes; and tunnel-shaped ventilating holes formed in the cylinder outer circumferential wall section between the pushrod insertion hole disposed on the side of the cooling fan and a cylinder bore and extending from the cylinder outer circumferential wall section on the side of the cooling fan to the cutout ventilating section.

Abstract: An exhaust fan chamber is defined with a belt cover and a fan cover provided over the belt cover, and an exhaust fan is accommodated in the exhaust fan chamber. The fan cover has an air intake port for sucking air within an engine cover into the exhaust fan chamber and an exhaust outlet port for discharging air within the exhaust fan chamber to outside of the exhaust fan chamber. The exhaust outlet port is in communication with an exhaust opening formed in an upper portion of the engine cover so that the air discharged through the exhaust outlet port is discharged to outside of the engine cover through the exhaust opening.

Abstract: An expansion tank is disclosed in which a non-return valve is fitted in an outlet port of the expansion tank to limit backflow of coolant into the expansion tank in the event that the pressure in the expansion tank falls below the pressure in a return conduit thereby preventing the expansion tank from filling with coolant. The non-return valve and the expansion tank are formed as a single component and the non-return valve is located in an outlet port of the expansion tank.

Abstract: A system and method for cooling an internal combustion engine. In one embodiment of the invention a cooling system for an internal combustion engine is disclosed, comprising an engine; an intercooler for receiving combustion air from a turbocharger, the intercooler comprising an air-to-liquid heat exchanger for exchanging heat between the combustion air and a liquid coolant; an intercooler radiator; at least one engine coolant radiator; an expansion tank; an oil cooler; and at least one pump, wherein the dedicated fan is controlled by a temperature switch or controller and wherein the at least one engine coolant radiator and the intercooler radiator are located on opposite sides of the engine.

Abstract: A valve arrangement for venting a coolant circuit of an internal combustion engine having several subcircuits includes a valve which is in fluid communication with a primary vent line extending from one of the subcircuits. At least one secondary vent line is in fluid communication with the valve and extends from another one of the subcircuits. The primary and secondary vent lines are connectable to a shared third vent line which feeds into a compensating reservoir arranged at a geodetically highest point in the coolant circuit. The valve is constructed to establish a continuous fluid communication of the primary vent line with the compensating reservoir via the third vent line and to establish a fluid communication of the secondary vent line with the compensating reservoir via the third vent line only in the presence of air bubbles in the secondary vent line.

Abstract: An air venting arrangement for a liquid cooling system associated with an internal combustion engine has a shunt vessel, and a transfer conduit connecting a flange portion of the shunt vessel to the liquid cooling system, and configured to pass coolant between the shunt vessel and the liquid cooling system. A venting conduit is disposed in a bore of the flange portion, and positioned to vent entrained air in the transfer conduit, developed during a filling of the cooling system, to a portion of the shunt vessel, and reduce the time required in filling of the liquid cooling system. A compression limiter and fastener connected to the compression limiter maintains and positions a first and a second end of the venting conduit at predetermined locations to provide venting of the transfer conduit to the reservoir portion.

Abstract: An exhaust fan chamber is defined with a belt cover and a fan cover provided over the belt cover, and an exhaust fan is accommodated in the exhaust fan chamber. The fan cover has an air intake port for sucking air within an engine cover into the exhaust fan chamber and an exhaust outlet port for discharging air within the exhaust fan chamber to outside of the exhaust fan chamber. The exhaust outlet port is in communication with an exhaust opening formed in an upper portion of the engine cover so that the air discharged through the exhaust outlet port is discharged to outside of the engine cover through the exhaust opening.

Abstract: A cooling system for a liquid cooled internal combustion engine having coolant passages and a heat exchanger selected to operate the engine cooling system in the region of nucleate boiling. A sensor detects the presence of nucleate boiling and a variable volume chamber has a flexible diaphragm urged on one side by controlled air pressure and responsive to the sensor maintain the coolant system pressure at a level maintaining optimum nucleate boiling to increase heat flux from the engine and reduce overall size of the system.

Abstract: An expansion tank for an engine cooling system comprises a housing forming a main chamber and a swirl chamber, the swirl chamber being defined by a cylindrical wall. An inlet connection discharges through an inlet orifice towards a collector duct having an entrance. From the inlet orifice the coolant is directed as a stream or jet along the adjacent surface of the cylindrical wall towards the entrance of the collector duct, guided by circumferential ribs. The kinetic energy of the stream is converted into pressure energy so that the pressure delivered from the outlet connection is slightly above the pressure at the top of the swirl chamber, above the level of liquid. This swirl chamber pressure is set by the relief pressure allowed by a filler cap, the gain in pressure helping to avoid cavitation in a coolant circulation pump.

Abstract: A cooling system for internal combustion engines provides directed flows of heated or cooled coolant to various engine components and/or accessories as needed. By providing directed flows, the overall coolant flow volume is reduced from that of conventional cooling systems, allowing for a smaller capacity water pump to be employed which results in a net energy savings for the engine. Further, by reducing the overall coolant flow volume, the hoses and/or galleries required for the directed flows are reduced from those of conventional cooling systems, providing a cost savings and a weight savings. Finally, by preferably employing an impellor type water pump, the expense of an electric water pump and its associated control circuitry can be avoided. The direct flows are established by a multifunction valve which, in a preferred implementation, comprises a two-plate valve wherein each plate is operated by a wax motor.

Abstract: A cooling system for a water-cooled internal combustion engine includes a coolant flow circuit and a coolant return passage. The coolant flow circuit includes a water pump, a water jacket having a plurality of serially connected flow passages, an oil cooler, a radiator, and a pressure-regulating valve for discharging coolant to a reservoir tank when pressure of the coolant in the coolant flow circuit reaches a predetermined target value. The coolant return passage supplies coolant from the reservoir tank to the coolant flow circuit via a check valve, which only allows coolant to flow in one direction from the reservoir tank to the coolant flow circuit.

Abstract: The invention relates to a device for reheating the water of the windscreen washers of a motor vehicle comprising, in the engine compartment thereof, a degassing box (1) forming part of the engine cooling system, and at least one tank (3) for pressurised washing water, said tank being associated with a circulation pump which pumps water therefrom and supplies said water to nozzles for spraying the same over the windscreens. The inventive device is characterised in that the tank (3) at least partially surrounds the degassing box (1), leaving a separation space of a determined thickness thereinbetween, and a double-walled hollow body (4) is integrated into said space, defining a closed thermal insulating volume.

Abstract: An engine cooling system is provided with a cooling circuit including a coolant pump for supplying an engine with a coolant and for circulating the coolant in the cooling circuit, and at least one heat exchanger for cooling said coolant downstream of the engine, wherein an expansion tank is connected to the cooling circuit upstream of the coolant pump. The cooling system is pressurized by a pressure regulating arrangement arranged to pressurize coolant supplied to the cooling circuit from the expansion tank during at least one predetermined operating mode of the engine and the expansion tank is closed to the ambient atmosphere during all normal engine operation modes.

Abstract: An air conditioning system for automobile having a heater core capable of heating the interior in good efficiency is to be provided. Such a heater core is supplied with the coolant having bubbles removed, and thereby the efficiency of heat exchange is enhanced and the noise is reduced. On the internal combustion engine is mounted a water outlet (bubble separating means) 3 having a receiving chamber 8 that the coolant after cooling the engine flows in. In the downstream position of the chamber 8 is formed a communicating portion 9 of narrowed sectional area and a feeding chamber 10 of increased sectional area in turn. The flowing velocity of the coolant is increased in the communicating portion 9 and decreased in the feeding chamber 10 and thereby it is possible to make bubbles in the coolant float up and separate out. As a result, the coolant without bubbles may be fed to the heater core 7 through a feeding portion 11.

Abstract: A reserve tank includes a tank body for storing coolant, an inflow portion for allowing the coolant to flow into the tank body, a guide portion, and an outflow portion for allowing the coolant to flow out of the tank body. The guide portion is disposed above the inflow portion and below a liquid level of the coolant in the tank body. Furthermore, the guide portion is adapted to guide a flow of the coolant flowing thereinto from the inflow portion and directed upward, substantially in a horizontal direction or downward with respect to the horizontal direction. Therefore, the reserve tank can restrict air from being trapped in coolant.

Abstract: An air venting arrangement for a liquid cooling system associated with an internal combustion engine has a shunt vessel, and a transfer conduit connecting a flange portion of the shunt vessel to the liquid cooling system, and configured to pass coolant between the shunt vessel and the liquid cooling system. A venting conduit is disposed in a bore of the flange portion, and positioned to vent entrained air in the transfer conduit, developed during a filling of the cooling system, to a portion of the shunt vessel, and reduce the time required in filling of the liquid cooling system. A compression limiter and fastener connected to the compression limiter maintains and positions a first and a second end of the venting conduit at predetermined locations to provide venting of the transfer conduit to the reservoir portion.

Abstract: A system and method for removing gases from an engine coolant system. In one embodiment, the system includes a fluid system that is operable to collects gas, and a gas collection system coupled to the fluid system. The system also includes a venturi pump system coupled to the fluid system and to the collection system, where the venturi pump system is operable to extract the gas from the fluid system via the collection system.

Abstract: The invention relates, in general, to internal combustion engine cooling, in particular for a motor vehicle, more specifically to a cooling agent compensation tank of a cooling circuit, in particular a low-temperature circuit for indirectly cooling a super-charging air for an internal combusting engine and to a method for cooling a highly heated structure, in particular an internal combustion engine. The inventive compensation tank is integrated into a main cooling circuit, wherein a means for directly introducing the cooling fluid is arranged on the compensation tank between the input and output connections and the cooling fluid flow coming into the compensation tank runs directly from the input connection to the output connection by means of said directly introducing means.

Abstract: A coolant air bleed structure is provided for a water-cooled internal combustion engine having a plurality of cylinders and a cylinder head, formed at upper portion of the cylinders. The cylinder head includes a coolant jacket formed therein. The coolant air bleed structure is disposed in an air bleed hole formed in a protrusion formed at a substantially central vertical portion of a sidewall of the cylinder head. The coolant air bleed structure is operatively connected to the coolant jacket, and includes a jiggle valve which is configured to open during a coolant changing operation.

Abstract: The invention provides to a cooling system and a method of cooling an engine-driven generator. The engine-driven generator includes an engine, a current generator, and a housing. The engine includes an engine air intake, and the current generator includes a generator air intake. The housing includes a first outlet, a second outlet, a first air passageway, and a second air passageway. The first air passageway is in communication with the second air passageway. The second air passageway partitions air into a first stream supplied to the engine air intake and a second stream supplied to the generator air intake. The first stream exits through the first outlet, and the second stream exits through the second outlet.

Abstract: A deaeration device for deaerating coolant fluid flow in a recirculation cooling system, where the recirculation cooling system includes a cooling fluid reservoir adapted to receive the deaeration device submerged within cooling fluid therein, includes an elongated deaeration tube including a fluid outlet and a deaerating skimming shaped slot for skimming air bubbles and cooling fluid from cooling fluid flow flowing through the deaeration tube, and including a fluid inlet for allowing the same amount of fluid that is skimmed off and removed through the top fluid outlet to re-enter the deaeration tube to maintain mass balance in the cooling fluid flow.

Abstract: A reserve tank includes a tank body for storing coolant, an inflow portion for allowing the coolant to flow into the tank body, a guide portion, and an outflow portion for allowing the coolant to flow out of the tank body. The guide portion is disposed above the inflow portion and below a liquid level of the coolant in the tank body. Furthermore, the guide portion is adapted to guide a flow of the coolant flowing thereinto from the inflow portion and directed upward, substantially in a horizontal direction or downward with respect to the horizontal direction. Therefore, the reserve tank can restrict air from being trapped in coolant.

Abstract: The circuit includes an internal volume for receiving a cooling fluid, a stopper for selectively closing an opening giving access to the internal volume, and ensuring element that the cooling fluid can be discharged via a discharge outlet. The respective discharge and access openings to the internal volume are distinct from each other, and a flap valve, which is detachably fixed in relation to the stopper and which is moveable between respective closure and release positions of the access opening when the flap valve is disconnected from the stopper, is also provided. The flap valve exclusively moves from its closed position when the pressure prevailing inside the internal volume is lower than a predefined pressure value.

Abstract: In a cooling circuit for an internal combustion engine of a motor vehicle including a pump device arranged upstream of the internal combustion engine, a cooler having an inlet side connected to a coolant outlet of the internal combustion engine and an outlet connected via a coolant line to the inlet side of the pump device, a cooler bypass line extending from the outlet side of the internal combustion engine to the inlet side of the pump device while bypassing the cooler and a switching valve arranged in the coolant line between the cooler and the pump device, a switching valve bypass duct is provided bypassing the switching valve and including a valve device which is open when the engine is shut down for reliable ventilation of the second coolant line during filling of the cooling circuit.

Abstract: The invention relates, in general, to internal combustion engine cooling, in particular for a motor vehicle, more specifically to a cooling agent compensation tank of a cooling circuit, in particular a low-temperature circuit for indirectly cooling a super-charging air for an internal combusting engine and to a method for cooling a highly heated structure, in particular an internal combustion engine. The inventive compensation tank is integrated into a main cooling circuit, wherein a means for directly introducing the cooling fluid is arranged on the compensation tank between the input and output connections and the cooling fluid flow coming into the compensation tank runs directly from the input connection to the output connection by means of said directly introducing means.

Abstract: A vehicle is capable of simplifying attaching a connection member and an atmospheric discharge member to a reservoir tank of a vehicle body. The vehicle is arranged such that it includes a connection member for connecting a heat exchanger for cooling an engine and a reservoir tank for storing liquid therein. An atmospheric discharge member attached to the reservoir tank and having an atmospheric discharge opening is located in the vicinity of the connection member.

Abstract: A surge tank comprises a liquid inlet portion designed to dissipate the energy of coolant flowing into the surge tank. Desirably, fluid is delivered into a pool of liquid in an initial chamber rather than into an air gap above a pool of liquid such that the pool of liquid assists in dissipating energy of the entering coolant. Coolant from the last of a series of initial chambers desirably exits in a manner that reduces the distance air bubbles must rise to separate from the coolant. Also, when coolant flows from one initial chamber to at least one other initial chamber, desirably the direction of flow of at least a major volume of the coolant is changed, such as by locating an outlet passage from one chamber at a lower portion thereof and the passage from a subsequent chamber at an upper portion thereof. Passageways between the various chambers may be of a progressively increasing total cross-sectional area to assist in reducing the velocity of fluid flow from one chamber to the next.

Abstract: A cooling system for a hybrid power system that includes an engine such as a generator engine, and a power converter such as an inverter, includes an engine cooling circuit, a power converter cooling circuit and a common coolant tank operatively coupled to both the engine and the power converter via the engine cooling circuit and the power converter cooling circuit respectively.

Abstract: A cooling system for a hybrid power system that includes an engine such as a generator engine, and a power converter such as an inverter, includes an engine cooling circuit, a power converter cooling circuit and a common coolant tank operatively coupled to both the engine and the power converter via the engine cooling circuit and the power converter cooling circuit respectively.

Abstract: A coolant air bleed structure is provided for a water-cooled internal combustion engine having a plurality of cylinders and a cylinder head, formed at upper portion of the cylinders. The cylinder head includes a coolant jacket formed therein. The coolant air bleed structure is disposed in an air bleed hole formed in a protrusion formed at a substantially central vertical portion of a sidewall of the cylinder head. The coolant air bleed structure is operatively connected to the coolant jacket, and includes a jiggle valve which is configured to open during a coolant changing operation.

Abstract: A surge tank comprises a liquid inlet portion designed to dissipate the energy of coolant flowing into the surge tank. Desirably, fluid is delivered into a pool of liquid in an initial chamber rather than into an air gap above a pool of liquid such that the pool of liquid assists in dissipating energy of the entering coolant. Coolant from the last of a series of initial chambers desirably exits in a manner that reduces the distance air bubbles must rise to separate from the coolant. Also, when coolant flows from one initial chamber to at least one other initial chamber, desirably the direction of flow of at least a major volume of the coolant is changed, such as by locating an outlet passage from one chamber at a lower portion thereof and the passage from a subsequent chamber at an upper portion thereof. Passageways between the various chambers may be of a progressively increasing total cross-sectional area to assist in reducing the velocity of fluid flow from one chamber to the next.