Abstract: A dual oil cooler arrangement for positioning in a tapered coolant flow cavity of a diesel engine block includes a pair of virtually identical oil coolers each of which are elongated and which are positioned in an end-to-end configuration extending substantially the entire length of the diesel engine block. The front oil cooler has a front oil inlet and a rear oil outlet. The rear oil cooler has a rear oil inlet and a forward oil outlet. A flow conduit network connects the oil inlets in a parallel flow pattern with a supply source of oil while the oil outlets are connected with an oil filter. The tapered coolant flow cavity in cooperation with the two oil coolers creates balanced and uniform coolant flow to each cylinder. There is a reduction in conduit bends and contraction and expansion points by this flow network. The two oil outlets are positioned near the midpoint of the engine block and this enables the cooled and filtered oil to be introduced into the main oil rifle at a more centralized location.

Abstract: The present invention relates to a housingless type oil cooler formed by laminating a plurality of plate members and an object thereof is to prevent deformation of an oil filter seal surface caused by excessive tightening at the time or mounting of an oil filter.

Abstract: The invention resides in improvements to refrigeration systems which rely on circulation of refrigerant gas through compression and expansion phases, and thereby discharging heat from a fluid to be cooled. The refrigeration systems of the invention include a refrigerant loop (24) and a lubricating oil loop (26). The oil loop includes a high capacity-to-volume oil to air oil cooler (48), for cooling the lubricating oil in the oil loop (26). The oil cooler includes a fan, and a variable speed drive for controlling the speed of rotation of the fan. The Preferred refrigerant is ammonia. Incorporating the above improvements into refrigeration systems enables an overall reduction in system sizing, and constancy in the temperature of the oil at the exit of the oil cooler. Such systems, having heat exchange capacity of at least 200,000 Btu/hr., up to at least 500,000 Btu/hr.

Abstract: A heat exchanger is disclosed for automotive lubricants and coolants wherein the heat exchanger has a calibrated bypass orifice located therein to maintain the flow therethrough at all times, particularly during cold flow operation, or high pressure transient conditions such as at engine start-up. The heat exchanger has a housing defining a fluid inlet chamber and a fluid outlet chamber. A separator is located between the inlet and outlet chambers and heat exchange passages are located between and communicate with the inlet and outlet chambers. The separator has a calibrated bypass orifice therethrough for the continuous flow of fluid between the inlet and outlet chambers bypassing the heat exchange passages.

Abstract: This invention relates to a reciprocating internal combustion engine having a cylinder crankcase in which a crankshaft is rotatably supported, to which crankshaft there is flexibly joined at least one connecting rod having a piston guided in a cylinder liner, the crankcase having fittings of an oil circulation system and various attached parts in a number independent of the number of cylinders. The crankcases with various numbers of cylinders can be cast, machined and assembled at the lowest possible cost because groups of fittings and attached parts have spacings to one of the two ends of the various cylinder crankcases (1) that remain constant.

Abstract: A control unit for circulating lubricating oil to vehicle engine parts comprising an oil tank for collecting lubricating oil; a hydraulic circuit which directs the lubricating oil to the appropriate parts and returns the lubricating oil to the oil tank; an oil pump provided in the hydraulic circuit for circulating the lubricating oil therein; at least one sub-oil tank which can contain an appropriate amount of lubricating oil; at least one hydraulic pipe which connects the sub-oil tank with the hydraulic circuit; and an oil pump which transfers, via the hydraulic pipe, lubricating oil from the sub-oil tank to the hydraulic circuit and from the hydraulic circuit to the sub-oil tank. The unit may also have a cooling bypass for diverting the lubricating oil from the hydraulic circuit to oil cooling means and means for regulating the amount of oil circulated in the hydraulic circuit and in the cooling bypass.

Abstract: A temperature control system in an internal combustion engine includes a heating arrangement which channels a flow of temperature control fluid from an engine to and from an exhaust heating assembly which is located adjacent to an exhaust manifold in the engine. The exhaust heat assembly permits the transfer of heat from the exhaust gases flowing in the exhaust manifold to the temperature control fluid. The heated temperature control fluid is then directed back to the engine for efficient heating. In one embodiment, the temperature control fluid is directed through a heat exchanger in the engine oil pan so as to maintain the temperature of the engine lubricating oil at or near its optimum operating temperature. In a second embodiment, the temperature control fluid is directed from the exhaust heat assembly to the intake manifold so as to increase the temperature of the intake air prior to combustion.

Abstract: A temperature controlling apparatus is adapted for association with preselected fluid systems of an internal combustion engine expected to be used in extremely cold atmospheres. The apparatus has a heater associated with a heat transfer reservoir which surrounds the fluid reservoir of the engine desired to be heated.

Abstract: A lubricating-oil device for an internal combustion engine having two cylinder banks and a lubricating oil circuit with a main oil passage in each cylinder bank comprises a casing cover which is mounted on the front of the engine and includes a heat exchanger and an oil filter with all required communication passages for the oil and a supply passage which interconnects the main oil passages in the cylinder banks and which is in communication with the oil filter outlet for concurrently supplying filtered oil from the oil filter to both main oil passages.

Abstract: A lubricating apparatus is disclosed for use in an engine having a crankshaft, at least one bearing for the crankshaft, and an oil pan for storing a lubricating oil reserve. The apparatus comprises a pump for pumping the oil up from the oil pan, an oil passage for providing fluid communication between a discharge port of the pump and the bearing to supply the oil to the bearing, and an oil recirculation passage for providing communication between the bearing and an inlet port of the pump to return the oil at the bearing to the pump. The apparatus further includes a temperature activated valve assembly along the recirculation passage. The valve assembly allows the oil to return from the bearing to the pump through the oil recirculation passage, when the temperature of the engine is below a predetermined temperature.

Abstract: Connection arrangement for pressure medium ducts in a diesel engine for connecting at least two ducts (2,3), included in the same pressure medium system, located parallel in the longitudinal direction of an engine block (1) and being in successive order in the flow direction of the pressure medium circulation of the system, either together or separately with one or more devices or units, for instance with coolers (8,9), located on the side of the ducts and included in the pressure medium system in question so that a desired direction of flow is accomplished and that said connection prevents the pressure medium flow of the inlet side and of the outlet side of the device from being mixed with each other. The arrangement includes a set of different, preferably cylindrical, hollow duct assemblies (4) to be installed in a connection chamber made in the engine block at a desired location.

Abstract: The present invention relates to a housingless type oil cooler formed by laminating a plurality of plate members and an object thereof is to prevent deformation of an oil filter seal surface caused by excessive tightening at the time of mounting of an oil filter.

Abstract: A number of embodiments of engine construction having chain-driven overhead camshafts closed by a timing case cover and which timing case cover forms at least in part a coolant pump to the engine. Various arrangement for circulating the liquid coolant through the engine and an oil cooler mounted at the base of the engine are disclosed.

Abstract: For avoiding exterior, cooling-water-carrying ducts, an internal-combustion engine comprising two mutually opposite cylinder banks has integrated ducts for the feeding and removal of the cooling water to the cooling jackets and the cylinder heads.

Abstract: An internal combustion engine which each cylinder has a cylinder cooling space and each cylinder head has a head cooling space, the individual cylinder cooling spaces being connected in series, the individual head cooling spaces being connected in series and the cylinder cooling spaces, as a group, cooling spaces, as a group, being connected in series. The engine includes a lubrication oil system which supplies cooling oil to the cylinder and head cooling spaces as well as supplying lubricating oil to lubricate other components such as the bearings for the crankshaft, the crankshaft and the piston connecting the rods.

Abstract: A casing cover for an internal combustion engine with an engine casing having two cylinder banks is mounted on one end of the engine casing and includes an oil cooler, an oil filter, an oil filter bypass arrangement and also a transverse cooling water passage in communication with main cooling water passages extending along the cylinder banks and a transverse oil passage in communication with main oil passages also extending along the cylinder banks, and comprises three adjacent but separate functional areas, a first lowermost area which includes the lubricating oil passages leading to and from the oil cooler, the oil filter and the main oil passages, a second functional area which includes a cooling water space receiving the oil cooler and is disposed above the first functional area and a third functional area which is disposed next to the second functional area and includes cooling water return passages receiving the cooling water from said cylinder banks.

Abstract: The present invention relates to a housingless type oil cooler formed by laminating a plurality of plate members and an object thereof is to prevent deformation of an oil filter seal surface caused by excessive tightening at the time of mounting of an oil filter.

Abstract: Disclosed herein is a drive shaft housing including outer side walls extending in spaced relation to each other, a forwardly located wall extending between the outer side walls, a rearwardly located wall spaced rearwardly from the forwardly located wall and extending between the outer side walls, a bottom wall extending between the outer side walls and between the forwardly and rearwardly located walls, which outer side walls, which forwardly and rearwardly located walls, and which bottom wall define an oil sump, a coolant passage extending vertically in one of the outer side walls, the forwardly located wall, and the rearwardly located wall, being adapted, adjacent the upper end thereof, for connection to a source of coolant, and terminating, at the lower end thereof, in a port located in the bottom wall, and a deflector fixed to the bottom wall and defining with the bottom wall a conduit extending along the bottom wall and having one end communicating with the coolant passage and a second end having an elon

Abstract: An apparatus for preoiling an internal combustion engine prior to starting. This device requires no pump and is operated by vacuum and oil pressure from the engine. The apparatus is controlled by novel switching means and is recharged with hot engine oil that is drawn into a holding chamber and surrounded by an outer vacuum chamber to keep the oil warm as the vacuum serves as an insulator. This apparatus is also equipped with a dual voltage heater that can be used for warming the oil when the engine has set for long periods in cold weather. The unit is completely self contained an injects a blast of warm oil into the engine prior to starting. This reduces friction and wear to the engine. At the same time, this will reduce the load on the engine increasing efficiency at engine start-up and in turn reduce pollutants.

Abstract: An engine oil pan includes a reservoir for oil flowing from the engine and a heat exchanger for cooling the oil, with the heat exchanger having at least one passage formed by fluid expansion.

Abstract: An oil cooler unit is described for use in combination with an internal combustion engine to cool the oil in the engine. The oil cooler can be threaded onto the oil filter mounting plate, and an oil filter can be threaded onto the opposite end of the oil cooler. As heated oil proceeds through the cooler, heat is dissipated through fins secured to the body of the oil cooler unit.

Abstract: An oil filtering and cooling device for use with an internal combustion engine is disclosed. It is composed of few components and easily fitted on or retrofitted to an internal combustion engine. In one embodiment, a pressure valve is employed to direct oil away from a cooling function yet allow for filtering thereof. The valve is a reed valve.

Abstract: A lubrication system (10) has a bypass valve (34) with an inlet port (60) connected to the outlet side of the oil pump (18). The valve (34) is connected to a electronic control unit (40) that has inputs (76), (78), (80), and (82) to receive information on oil pressure, coolant temperature, oil temperature, engine speed and engine load to control the operation of an electric motor (38) which opens and closes the bypass valve (34). The oil pressure within the engine supply passage (22) is thereby controlled by the position of valve (34).

Abstract: A cooling manifold for large diesel engine systems, disposed between a lubrication oil cooler and the engine system coolant pumps. The manifold system provides an increased coolant flow area at the oil cooler outlet housing, with associated improvement in both the total coolant flow rate and the distribution of that flow in the oil cooler heat exchange tubes. The increased flow is provided by additional inlet ports, which also enhances the flow distribution. High velocity flow tubes direct a localized stream of high velocity coolant, obtained directly from the discharge of the engine coolant pumps via a recirculation line, to assure proper Net Positive Suction Head and prevent vortex void formation in the coolant pump suction during peak operating conditions. The manifold can be retrofitted on existing diesel engines, or installed in the engine system during manufacture.

Abstract: The inlet and outlet passages communicating with a water-cooled engine oil cooler for a vehicle, such as a motorcycle, are arranged for bypass of a regulated amount of oil from the inlet passage to the outlet passage to enhance the flowability of the cooled oil. Provision is made for a replaceable flow control orifice between the oil inlet and outlet passages to regulate oil viscosity. Also described is an arrangement providing for mounting the cooler to the crankcase or oil pan surface whereby air flowing past the cooler during movement of the vehicle assists the effects of the cooling liquid.

Abstract: An oil pan is provided with a partition member so as to be divided into a main chamber and an antechamber. A vertical wall of the partition member is provided at a lower region thereof with first holes adjacent to an opening of a draft tube of an oil pump and at an upper region thereof with second holes in the vicinity of an oil level. In a state of warming up following the starting, since the oil temperature is low and the viscosity of the oil is large, the oil in the antechamber cannot pass through the first holes. Accordingly, only the oil in the main chamber a quantity of which is small is circulated through the engine by the oil pump, thereby warming up the engine quickly. Low temperature oil in the antechamber is interchanged with the oil in the main chamber little by little through the second holes, so that the temperature thereof is raised gradually.

Abstract: An adapter mechanism for use between an engine and an oil cooler manifold, includes a special nut having internal threads for screw-on engagement with an externally threaded engine boss. External threads on the nut mate with threads on a central wall portion of an associated oil cooler manifold to operatively connect the manifold with oil passages in the engine block. Differently dimensioned nuts may be selectively utilized to connect a given manifold with a range of different engines. An annular adapter plate is positioned between the manifold and engine to provide sealed passage connections to or from the manifold passages.

Abstract: A differential pressure valve 6 is provided in an engine lubricating system which spills lubricating oil into a bypass line 5b bypassing a lubricating oil heat exchanger 7. Connected downstream of the differential pressure valve 6, is a pressure-maintaining valve 10, which holds the oil pressure approximately constant when the internal-combustion engine is running and protects the lubricating oil pump against too high a pressure upon starting of a cold internal-combustion engine.

Abstract: A motorcycle engine having an exhaust passage air introduction system. Each cylinder includes two exhaust passages which are joined at a point displaced from the engine. Air is introduced into one of the exhaust passages of the two so as to more fully combust the unburned gasses within the exhaust passage and then to more fully combust the unburned exhaust in the joined passage. The timing of the valves associated with each exhaust passage is such that the valve associated with the passage having the air inlet has advance timing. A chain tensioner for the timing chain includes a tensioner cylinder hydraulically actuated by the engine oil. A gasket having an orifice therein is positioned between components in the oil passageway extending to the tensioner cylinder. The oil cooling system of the engine includes an oil filter and an oil cooler which are displaced from one another and mounted to a common base which is in turn mounted to the engine.

Abstract: An auxiliary oil pump selectively operative is mounted in fluid communication with a primary oil pump relative to an internal combustion engine, wherein the auxiliary oil pump is arranged for prelubrication of an existing internal combustion engine.

Abstract: A lubricating apparatus for an internal-combustion engine comprises a detector for detecting whether the engine runs or not, a heat storage reservoir connected to lubricating oil outflow and inflow ports of the engine by a circular pipe system for storing the oil and maintaining its temperature, the heat storage reservoir being provided outside the engine, a hydraulic pump provided between the inflow port and the heat storage reservoir for controlling the supply of the oil stored in the heat storage reservoir to portions of the engine in response to a control signal, and a controller responsive to an output of the detector for producing the control signal to stop the hydraulic pump in order to maintain a temperature of the oil stored in the heat storage reservoir when the detector detects a stop of the engine and for producing the control signal to actuate the hydraulic pump to supply the oil, whose temperature is maintained by the heat storage reservoir, to the portions of the engine.

Abstract: A snowmobile having a liquid cooled transversely disposed internal combustion engine comprised of two blocks each containing two cylinder in aligned fashion. The coolant pump for the engine is disposed on one side of the engine and communicates with cooling jacket inlets on the other side through conduits that extend through the crankcase for controlling the temperature of the crankcase.

Abstract: A fluid filter assembly comprises a heater and a filter in series fluid flow relationship. A means for bypassing a fluid around the heater and the filter is provided which comprises ducts and a relief valve interposed between them. In normal operation the relief valve is closed so all the fluid flows through the heater and the filter. The fluid and any liquid impurities entrained therein are heated by the heater prior to passing through the filter. At low temperatures the heater cannot normally provide sufficient heat to prevent solidification of the liquid impurities entrained within the fluid which block the filter. The relief valve then opens to allow a proportion of fluid to flow through the bypass so a reduced amount of fluid flows through the heater and the filter. The heater heats the reduced flow of fluid therethrough to a temperature sufficiently high to melt the solidified liquid impurities blocking the filter.

Abstract: An engine of a motorcycle is provided with a lubricating apparatus and a crank case within which is mounted a crank shaft having one end extending outwardly from a side wall of the crank case, and a cam sprocket drive gear is mounted upon the crank shaft. A cam chain chamber within which a chain is disposed in a loop is formed upon one side of a cylinder block including a cylinder and a piston and a cylinder head disposed above the cam sprocket drive gear. An oil passage hole is formed within a mating face of the crank case to be mated with the side cover, and an oil passage tube is inserted into the oil passage hole.

Abstract: A threaded temperature indicating plug for hot oil containing housings such as vehicle transmissions and the like that can replace the standard oil level plugs of the same and as well afford a plug that from which the temperature at which the oil may have overheated will be recorded and whether there is a definite need to change the oil in the transmission. Liquid crystal areas are provided on an indicator label that is fixed to the plug bolt shank in a liquid-tight manner by a fixed covering and for direct contact with the oil body or a splash from oil at a lowered level.

Abstract: An automatic self compensating flow control lubrication system for continuously supplying the requisite amount of lubricant to at least one component of a drive system. One or more operating parameters, such as scavenge temperature, are continuously monitored and the information provided to a computer. The computer operates the first stage solenoid valve of a two stage valve assembly which provides such an amount of lubricant to the component as is necessary to maintain a predetermined value of the operating parameter. Scavenge temperature is one such operating parameter.

Abstract: A heat exchanger of the tube-fin type comprising a tank (10) having first (14) and second (16) ends, a plurality of tubes (34), a plurality of baffles (38) and a plurality of fins (42). A cap (50, 52) is connected to each end (14, 16) of the tank (10) and includes a fluid coupler (60, 61). Each cap (50, 52) comprises a female member (74) disposed therein including a plurality of interior passageways (88), first (90) and second (92) annular channels intersecting with opposite ends of the passageways (88), and a plurality of islands (94) bounded by the passageways (88) and first (90) and second (92) channels. The tank (10) further comprises a male member (72) extending from each end (14, 16) and including a plurality of outwardly extending tabs (76), an annular extending rim (82), and an annular resilient seal (84).

Abstract: A heating system, in particular for motor vehicles, which utilizes waste heat of an internal combustion engine and has a heater that can be operated with liquid fuel for generating heat independently of the operation of the internal combustion engine or in addition to the waste heat of the engine, wherein the heater is associated with an oil storage space of the internal combustion engine. The heater is arranged with its direction of principal extension essentially in parallel to the axis of the crankshaft and eccentrically, mainly in the oil pan of the internal combustion engine.

Abstract: An oil cooler for motor oil used in engines has an element core, a base on which the core is placed, and a casing housing the element core. The core consists of a plurality of sets of two elements being combined together face-to-face and a fin member which is placed on the set of elements. These two elements and one fin member are join together to make a single unit. Several units are contained in the casing of the oil cooler. Cooling water circulates through the flat hollow doughnut-like elements combined. A partition is formed in the interior of the elements combined and a set of cooling water supply hole and exit hole is provided at both the sides of the partition. The core of elements and a base on which the core is placed are brazing adhered or fixed to each other in a hot vacuum furnace and then a dish-like cap is applied to the base. Motor oil to be cooled is led from the engine block to a filter mechanism through several fin members situated between elements.

Abstract: The inlet and outlet passages communicating with a water-cooled engine oil cooler for a vehicle, such as a motorcycle, are arranged for bypass of a regulated amount of oil from the inlet passage to the outlet passage to enhance the flowability of the cooled oil. Provision is made for a replaceable flow control orifice between the oil inlet and outlet passages to regulate oil viscosity. Also described is an arrangement providing for mounting the cooler to the crankcase or oil pan surface whereby air flowing past the cooler during movement of the vehicle assists the effects of the cooling liquid.

Abstract: A prelubricating system for an internal combustion engine includes an oil intake dimensioned for insertion into the dipstick well of the engine. The oil intake tube is connected to an inlet side of an electric pump. An outlet side of the pump is connected to the oil pressure sender coupling aperture on the engine block for supplying oil to internal oil passages. A pressure activated switch causes actuation of the electric oil pump when the engine ignition switches is activated. When a predetermined oil pressure is achieved, the electric pump is deactuated and the engine starter motor solenoid is energized. In a second embodiment, the system includes an electric oil heater and a thermostatic control for preventing starting of the engine until a predetermined oil pressure and temperature has been reached. The oil intake tube includes a quick release coupling and a graduated scale for measuring the quantity of oil in the sump.

Abstract: An oil cooler for small internal combustion engines is provided. The oil cooler comprises a heat exchanger mounted on the external surface of the engine crankcase, directly below the flywheel. The heat exchanger has an inner serpentine passageway in flow communication with the lubrication path of the engine oil. The heat exchanger further has a plurality of external fins, said fins being positioned directly below the flywheel. The flywheel includes a plurality of inlet apertures for drawing in cooling air to be blown over the heat exchanger.

Abstract: A one-piece combination radiator tank and oil cooler for an automotive vehicle comprises a molded polymer structure of double wall construction such that the space between the walls is an oil cooler reservoir which shares a common wall with the coolant reservoir of the radiator tank. The heat from the oil reservoir is transferred to the coolant reservoir. Heat transfer across the common wall is enhanced by using high surface area shapes and by using surface features that promote good heat transfer. The inlet and outlet fittings are also molded polymer. The whole assembly is molded as one piece or as a very few pieces which are bonded together.

Abstract: A plastic oil pan (16) for an internal combustion engine (14) has an upper lip (18) for mating with the engine in sealing relation, sidewalls (21-24) depending downwardly below the lip, a bottom (26) extending between the sidewalls below the lip to provide a closed-bottom receptacle for holding engine oil, and a plurality of reinforcing walls (28, 30, 36, 38, 40) integrally formed along the sidewalls and increasing the mechanical strength of same to enable the plastic oil pan to support the engine when the latter rests on the oil pan during installation or repair procedures. A conduit (54) extends through the oil pan and passes engine coolant therethrough to cool the engine oil. Particular oil pan and conduit structure is disclosed.

Abstract: An oil cooler and a radiator hose are combined in an all polymer structure. Generally concentric hoses provide two coolant paths with the wall of the inner hose providing heat transfer from one fluid to the other. The hoses are flexible or can be formed to conform to desired radiator hose routing. The hoses have deflectable vanes extending from their walls into the fluids to flex according to flow rate. The vanes induce turbulence to improve the thermal transfer especially at low flow rates but deflect at high flow rates to minimize pressure drop due to the vanes.

Abstract: An automotive oil cooler used in combination with an oil filter. The oil cooler is comprised of a heat exchange element which is constructed of a plurality of heat transmission plates. The heat transmission plates are piled up one upon another and fixedly secured by brazing in such a manner as to define oil and water flowing spaces on the opposite sides of each heat transmission plate. Oil and water flow through the oil and water flowing spaces, respectively. The heat exchange element is formed with a plurality of oil supply passages through which oil is supplied to the oil filter, an oil inflow passage communicating with the oil flowing space to receive oil from the oil filter, an oil outflow passage communicating with the oil flowing space to receive oil from the oil flowing space, a water inflow passage communicating with the water flowing passage, and a water outflow passage communicating with the water flowing space to receive water from the water flowing space.

Abstract: A combined filter and heat exchanger for simultaneous filtering of a first medium and heat transfer between the first medium and a second medium, for example a combined oil filter and cooler for internal combustion engines includes a filter section comprising a hollow, cylindrical filter element (2) arranged co-axially within an outer casing (1) having a cylindrical wall (1a) which extends around the filter element coaxially therewith and in spaced relationship thereto. A heat-exchanger section is arranged in the space between the cylindrical wall (1a) and the filter element (2). The heat-exchanger section includes a cylindrical partition wall (5) subdividing said space into two chambers. The first medium flows first through the inner chamber and is then distributed across the outer surface of the filter element (2), whereas the second medium flows through the outer chamber (7).

Abstract: A heat exchanger for an internal combustion engine includes a first conduit, a second conduit positioned outside of the first conduit, a third conduit positioned inside of the first conduit, a first annular passage formed between the first and second conduits, and a second annular passage formed between the first and third conduits. Heat exchange is performed between a first fluid flowing through the first annular passage and the inside of the third conduit and a second fluid flowing through the second annular passage.

Abstract: A diesel engine wherein the interior of the cylinder or cylinders, the piston or pistons, the crankshaft, the connecting rod or rods and the valves are lubricated and cooled by a first flow of lubricant which is circulated from and back to the sump by a first pump of a tandem pump. The second pump serves to circulate lubricant which serves to externally cool the cylinder or cylinders and the head as well as to heat the cabin or compartment in a motor vehicle.

Abstract: A cooling device for cooling an automatic transmission by forcing air into heat transference with the transmission pan comprising a framework spaced below the bottom surface of the pan to provide a gap for the flow of air and a plurality of slats; each of the slats mounted to the framework at an upwardly inclined angle from front to rear transverse to the length of the pan and in parallel relationship with one another. Each of the slats is provided with an air intake opening, each opening being raised on successive slats from front to rear in "stair-step" fashion for maximum heat transference over the length of the pan. A pair of brackets are provided for mounting the device to existing pans or, in the alternative, the device may be unitary with the pan. The device is particularly useful on all vehicles having adequate ground clearance such as pickups, trucks, motor homes, and the like.