Abstract: A tamper-proof adjustment screw arrangement for a vehicle fuel supply system for preventing tampering with the setting of an adjustment screw that is situated in a common recess with a component requiring the availability of continued access. In a preferred embodiment, a tamper-proofing shield coacts with the configuration of a portion of a recess having a stepped bottom wall and with a spanner jam nut on the adjustment screw to create a press fit mounting of the shield that makes it exceedingly difficult to pry off the tamper-proofing shield. As an additional safeguard, the spanner nut is designed to require a special tool for loosening thereof.

Abstract: In a method of assembling a roller cone type rock bit, on a body having a tool joint adjacent one end and at least one leg portion adjacent the other end, the leg portion is provided with a longitudinally outer surface which is inclined longitudinally inwardly from its radially outer extremity to its radially inner extremity; on a base for a cone assembly, an end surface is provided configured to mate with the outer surface of the leg portion of the body; a roller cone is rotatably mounted on the base distal the end surface to form a cone assembly, and the end surface of the base is mated with the outer surface of the leg portion; the base is then welded to the leg portion along the juncture of the mating surfaces to mount the cone assembly on the leg portion.

Abstract: A compression braking system for an internal combustion engine is provided which includes a compact housing disposed adjacent the fuel injecting actuating assembly and the exhaust valve actuating assembly for each cylinder of the engine. The housing is provided with a first cavity in which is reciprocally mounted a first piston having one end thereof protruding from one end of the first cavity and being engaged and moved by the fuel injecting actuating assembly. A second cavity is formed in the housing in a proximate angular relation with the first cavity. Reciprocally mounted within the second cavity is a second piston having one end thereof protruding from one end of the second cavity and engaging and moving the exhaust valve actuating assembly to releases compression pressure within the cylinder and provide retarding power when the engine is in the compression braking mode.

Abstract: An auxiliary heater controller is provided for use with a liquid cooled engine which includes two fluid circuits. The first fluid circuit includes the engine, a heat exchanger with an air flow creating fan, a heater and a pump, while the second fluid circuit shunts the engine and includes only the heat exchanger, heater and the pump. A single two-way valve operates to direct fluid to either the first or the second fluid circuit, and a timer unit is provided which operates automatically at a preset time to cause fluid to flow in the first fluid circuit for a predetermined time period. The air flow creating fan is operated by a thermostat at low speed when the engine is not operating and is operated by a manually controlled variable speed control unit when the engine is operating.

Abstract: Methods for the remanufacture and reconditioning of rock drill bits of the type which include rolling cone cutters are provided. One method includes the steps of separating the bit leg extensions, journals and cone cutters from the bit body along a line perpendicular to the center of rotation of the bit body, salvaging usable cutter teeth, forming new leg, journal and cone assemblies and attaching the new assemblies to the salvaged bit body, which has been suitably machined to accept the new assemblies. An alternate method includes removing separately each leg, journal and cone cutter from the bit body in a manner which forms a curved saddle bore in the bit body, forming a new leg, journal and cone assembly including a mating surface corresponding to the configuration of the saddle bore and attaching each new assembly to the bit body at a saddle bore.

Abstract: A cylinder head gasket for an internal combustion engine which is adapted to compensate for variations in the clamping or hold-down forces which are exerted on the gasket disposed within the joint formed between the cylinder head and the engine block. Because of the spacing of the cylinder head fasteners relative to the ends of the cylinders formed in the block, there are wide areas of the gasket extending between adjacent cylinder ends which are disposed at substantial relative distances from such fasteners. These wide gasket areas are defined at least in part by opposed circumferential segments of the adjacent cylinder ends. Each wide gasket area has a thickness which is substantially greater than the thickness of te remaining portions of the gasket, thereby, resulting in substantially uniform clamping forces being exerted throughout the gasket.

Abstract: A poppet-type valve having a circumferential seating face including an annular seating area extending between inner and outer radial limits, a circumferential groove formed in the seating face and hardfacing material in the groove, the groove extending radially inwardly from the valve head periphery a sufficient distance beyond the inner radial limit that high temperature deposition of hardfacing material within the groove will not cause substantial dilution by valve head material of the composition of the hardfacing material within the annular seating area.

Abstract: A piston ring assembly wherein a piston member operating within a cylinder is lubricated by means of gas rather than oil films or solid lubricants. One ring (located near the lower end of piston) or two rings (one located near the lower end and the other near the top end of piston) trap gas between the piston and the cylinder wall to form a gas bearing area. The rings are designed to permit gas flow in one direction into the gas bearing area.

Abstract: An air filter unit is provided for use with an internal combustion engine. The unit includes inner and outer sleeves, a filter medium disposed intermediate the sleeves, and end plates affixed to and overlying the corresponding ends of the sleeves and filter medium. At least the outer sleeve is formed from a blank of foraminous, relatively stiff, sheet material with the periphery thereof including burr-forming peripheral portions and an elongated peripheral portion folded back upon itself to form a hem-like segment. The blank is then formed into a cylindrical sleeve with the hem-like segment overlapping and being affixed to a burr-forming peripheral portion opposite the hem-like segment so as to form an elongated seam extending the length of the sleeve. The overlapped seam-forming peripheral portion being exposed only on an interior surface of the sleeve.

Abstract: A rocker arm assembly for an internal combustion engine is provided which is lightweight and inexpensive to manufacture, which securely mounts and supports a pair of rocker arms and associated structures on the cylinder head of an internal combustion engine, and which provides and maintains a supply of lubricant to the rocker arm bearing structures, valves and push rods. The rocker arm assembly includes a two part pedestal which clamps the shaft on which the rocker arms are journaled to the engine. The base portion of the pedestal includes a pair of positioning projections which position and support the pedestal so that the proper alignment of the rocker arms relative to the longitudinal axis of the engine is achieved and maintained.

Abstract: A head gasket, for sealing a junction between a top face of a cylinder block of an engine and a bottom face of a cylinder head thereof, of the type having a row of relatively large circular cut-outs, that, in use, correspond in size, number and position to that of cylinder spaces formed in the cylinder block and a plurality of apertures that are relatively small in comparison to the circular cut-outs that, in use, correspond in number and position to coolant passages formed in the faces of the cylinder block and cylinder head, as well as holes sized and positioned, in use, in accordance with holes in the cylinder block and head for connecting bolts and holes for lubricant circulation. In addition to a first row of apertures extending along a first lateral side of the circular cylinder cut-outs, the gasket is provided with a second row of apertures that are used to orifice outlet coolant passages from the cylinder head to the cylinder block.

Abstract: An engine compression braking system for an internal combustion engine is provided which utilized a combination of a hydraulic reset mechanism and a lash take-up device. The mechanism and take-up device assure that the engine exhaust valves are closed, or substantially closed, prior to the normal opening of the exhaust valves during the power stroke of the engine drive pistons without adversely affecting the retarding horsepower produced by the engine during a braking mode.

Abstract: A lubricant supply rail is provided for an internal combustion engine to provide an adequate supply of lubricant from the engine lubrication circuit to the bearing surfaces of the rocker arms, the valves and the push rods. The lubricant supply rail of the present invention is configured to provide automatic fluid communication between the cylinder head lubricant outlet port and the lubrication channels contained within the rocker arm support assembly and includes a lubricant supply inlet which communicates directly with the cylinder head and a plurality of transfer bores spaced to communicate directly with each rocker arm support assembly. The lubricant supply rail is preferably formed of nylon or like material and includes a conduit portion sealed at each end by end caps having a configuration which permits effective sealing of the conduit by ultrasonic welding techniques.

Abstract: A positive displacement fuel injection system for use with a combustion engine including a fuel pump (10,10') which forms and delivers pre-metered slugs of fuel and timing fluid to unit injectors (300,300') associated with the engine combustion chambers. The pre-metered slug of timing fluid has a prescribed volume and sets the timing advance for the unit injector. The fuel pump can vary the size of the pre-metered slugs of fuel and timing fluid on a cycle-by-cycle basis.

Abstract: A cooling system for an internal combustion engine is provided wherein coolant subsequent to flowing through the engine is selectively directed through one of two circuits or simultaneously through both circuits dependent upon the temperature of the coolant at predetermined locations within the system. One of the circuits includes a thermostatically controlled primary valve downstream of the engine unit and having an inlet port communicating therewith; a first bypass line having an upstream end connected to one outlet port of said valve; a radiator with a common inlet header and an outlet header with segregated segments, the inlet header being connected to a second outlet port of the valve; and an aftercooler downstream of the radiator and having an inlet side communicating with one segment of the radiator outlet header and a downstream end of the first bypass line. The aftercooler has an outlet side communicating with an intake side of a coolant pump.

Abstract: A disposable air filter assembly is provided for use with, but not limited to, an internal combustion engine. The filter assembly includes a housing having a substantially spiral interior air flow passageway. The housing is of molded construction whereby the end walls thereof are initially integral with an intervening outer wall but subsequently a section of one of the end walls is severed from the remainder of the housing exposing the interior passageway. A filter member, conforming substantially to the configuration of at least a portion of the passageway is inserted therein. Subsequent to the filter member being inserted into the passageway, the separated end wall section is re-attached to the remainder of the housing. An inlet to the interior passageway is provided on the exterior of the housing whereby the air flow is in a substantially tangential direction. An outlet for the passageway downstream of the inlet is provided which communicates with the intake manifold of the engine.

Abstract: An adaptor (ladder frame 10) and oil pan assembly (14), including a method of assembly therefor, is disclosed for mounting on an internal combustion engine block (2) equipped with a lubrication system designed to receive oil for recirculation through an inlet port (22) in the ladder frame (10) offset from the center of the oil pan assembly (14) when the assembly (14) is mounted in one of two reversed positions. The oil pan assembly (14) includes an asymmetrically offset oil pan reservoir (27) and integrally connected sump pipe (28, 48) within the interior of the pan shaped in accordance with the intended position of the oil pan assembly when mounted on the engine. The shape of the sump pipe (28, 48) is selected to provide automatic alignment and connection between the reservoir (27) and the inlet port (22) when the oil pan assembly (10) and sump pipe (28, 48) are simultaneously mounted on the engine.

Abstract: An internal combustion engine, of the type having a block with a line of cylinders and a cylinder head attached to the block and coolant distribution and discharge manifolds provided adjacent each other on one side of the block is provided with an improved coolant arrangement. Coolant from a pump enters the distribution manifold at a point intermediate the ends of the line of cylinders and from there flows freely up into the cylinder head through cast openings corresponding in number to the number of cylinders. The majority of coolant flows across the cylinder head and down to coolant chambers surrounding the engine cylinders via a pair of orificed holes for each cylinder. The orificed holes control the flow of coolant around the cylinders and are provided in a gasket between the cylinder block and cylinder head. After the coolant flows around the cylinder liners, it is discharged from the coolant chambers in the cylinder block to the discharge manifold via a cast opening for each cylinder.

Abstract: A valve cover for an internal combustion engine has a cover body of an inverted trough-like configuration and a perimetric flange surrounding its open bottom side. A seal receiving groove is formed in a bottom surface of the perimetric flange and extends more than one full circuit around the perimeter of the open side. An elongated elastomeric seal strip of a length that is greater than the circumference of the cover body, as measured within the seal receiving groove, is inserted into the seal receiving groove in a manner wherein opposite ends of the seal strip are overlapped side-by-side and wherein the bottom of the seal strip extends out of the seal receiving groove in a manner forming a sealing ridge around the bottom of the perimetric flange of the cover body.

Abstract: A cylinder block for an internal combustion engine is provided which includes a plurality of relatively spaced free-standing cylinder tubes disposed within a cooling jacket formed in the block. The cylinder tubes are connectedly supported by, and extend upwardly from, the floor section of the cooling jacket. The jacket floor section is reinforced by at least one elongated rib-like member which is integral with and depends from the underside of the floor section and is located between adjacent cylinder tubes. Each rib-like member substantially spans the distance between opposing walls that form, in part, the cooling jacket, and is remote from a cavity within the jacket through which a coolant is caused to circulate during operation of the engine. Bolt receiving means of the cylinder block are positioned so that, when restraining bolts are introduced and tightened to secure a cylinder head to the block, substantially uniform support of the cylinder tubes from their lower portion is achieved.