89766 Mariner SCREW, (#10-32 x .620) Stainless Steel

Illustration 1 g00907382
Left side view of the 3056E engineTypical example of the 3056E engine (1) Crankshaft pulley (2) Engine coolant temperature sensor (3) Fuel lines (4) Machine interface connector (MIC) (5) Engine oil pressure sensor (6) Speed/timing sensor (7) Electronic control module (ECM) (8) Engine oil filter (9) Electronic fuel injection pump
Illustration 2 g00907383
Right side view of the 3056E engineTypical example of the 3056E engine (10) Boost pressure sensor (11) Air inlet temperature sensor (12) Starter (13) flywheel housing (14) Flywheel (15) TurbochargerThe 3056E diesel engine is electronically controlled. The engine is similar to the previous Caterpillar engines that were electronically controlled. However, the 3056E uses an Electronic Control Module (ECM) to control a fuel injection pump. The pump supplies fuel to the fuel injection nozzles. The six cylinders are arranged in-line. The cylinder head assembly has one inlet valve and one exhaust valve for each cylinder. The ports for the inlet and the exhaust valves are on the right side of the cylinder head. Each cylinder valve has a single valve spring. Each cylinder has a piston cooling jet that is installed in the cylinder block. The piston cooling jet sprays engine oil onto the inner surface of the piston in order to cool the piston. The pistons have a Fastram combustion chamber in the top of the piston in order to provide an efficient mix of fuel and air. The piston pin is off-center in order to reduce the noise level.The pistons have two compression rings and an oil control ring. The groove for the top ring has a hard metal insert in order to reduce wear of the groove. The skirt has a layer of graphite in order to reduce wear. The correct piston height is important in order to ensure that the piston does not contact the cylinder head. The correct piston height also ensures the efficient combustion of fuel which is necessary in order to conform to requirements for emissions.A piston and connecting rod are matched to each cylinder. The piston height is controlled by the length of the connecting rod. Seven different lengths of connecting rods are available in order to attain the correct piston height. The different lengths of connecting rods are made by machining the small end bearing off-center in order to form an eccentric bearing. The amount of the eccentricity of the bearing creates the different lengths of the connecting rods. The crankshaft has seven main bearing journals. End play is controlled by thrust washers which are located on both sides of the center main bearing.The timing case is made of aluminum. The timing gears are stamped with timing marks in order to ensure the correct assembly of the gears. When the number 1 piston is at the top center position on the compression stroke, the marked teeth of the following components will match the marks that are on the idler gear: crankshaft, camshaft and fuel injection pump. There is no timing mark on the rear face of the timing case.The crankshaft gear turns the idler gear which then turns the following gears:
the camshaft gear
the fuel injection pump
a lower idler gear which turns the gear of the lubricating oil pumpThe camshaft and the fuel injection pump run at half the rpm of the crankshaft. The cylinder block provides support for the full length of the dry cylinder liners. The cylinder liners are a press fit part. The cylinder liners are pressed into the cylinder block. The cylinder liners have a flame ring above the flange.
Illustration 3 g00910750
The Bosch VP30 fuel injection pump is installed on the engine. The pump conforms to current emissions. Both the pump timing and the high idle are preset at the factory. There are no serviceable parts inside the pump. The pump is only serviceable through a Bosch dealer. Adjustments to the pump timing and high idle should only be made by personnel which have had the correct training. The fuel injection pump uses the engine ECM to control the engine RPM.The specifications for the 3056E refer to the Specifications, "Engine Design".