GASKET 7N4976 - Caterpillar

Engine Description
Note: When you are ordering new parts, refer to the engine identification number in order to receive the correct parts. Refer to the Operation and Maintenance Manual, "Product Identification Information" for the correct numbers for your engine. The four engine cylinders are arranged in-line. The engines are controlled by a mechanically governed fuel injection pump. The cylinder head assembly has one inlet valve and one exhaust valve for each cylinder. Each valve has one valve spring. The pistons have two compression rings and an oil control ring.It is important to ensure the correct piston height so that the piston does not contact the cylinder head. The correct piston height also ensures the efficient combustion of fuel.The crankshaft has five main journals. End play is controlled by thrust washers that are located on both sides of the center main bearing.The timing case has a hole that corresponds with a hole in the crankshaft. Use an alignment pin to find TC. The camshaft gear has a timing hole that corresponds with a timing hole in the timing case. The timing holes ensure that the camshaft and the crankshaft are in time with each other. The crankshaft gear rotates the idler gear. The idler gear rotates the camshaft gear and the fuel injection pump gear. The idler gear for the engine oil pump is rotated by the crankshaft gear. This idler rotates the engine oil pump.The fuel injection pump is a gear-driven pump that is mounted to the back of the front housing. The fuel transfer pump is electrically operated. The fuel transfer pump has an integral fuel filter. The fuel transfer pump is usually located on the left hand side of the cylinder block. Some applications may require the fuel transfer pump to be relocated.The engine oil pump is a gerotor. The oil pump is driven by an idler gear. The engine oil pump sends lubricating oil to the main oil gallery. The oil relief valve is internal to the oil pump.Coolant from the bottom of the radiator passes through the centrifugal water pump. The pump is rotated by a gear. The gear of the pump is rotated by the gear from the fuel injection pump.Lifting the Engine
Failure to follow recommended procedures for handling or transporting engines can lead to engine damage.To avoid possible engine damage, use the following procedure.
When you are lifting or moving the engine, use the following procedures in order to prevent engine damage.
Do not tilt the engine to an extreme angle unless the lubricating oil is first drained from the oil pan.
Do not turn the engine onto a side or an end surface unless the lubricating oil is first drained from the oil pan.
If the oil is not drained prior to tilting the engine or turning the engine onto a side or an end surface, the lubricating oil from the oil pan can flow into the intake manifold and the cylinder bores. This situation could cause a hydraulic lock in the engine. Hydraulic lock can