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| Illustration 1 | g00661183 |
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Lubrication system components (1) Engine oil filter bypass valve (2) Engine oil cooler (3) Engine oil cooler bypass valve (4) Engine oil filler (5) Engine oil filter (6) Engine oil level gauge (7) Engine oil line to the engine oil cooler and to the engine oil filter | |
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| Illustration 2 | g00661069 |
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Lubrication system schematic (naturally aspirated engine) (1) Passage for engine oil through the rocker arm shaft to the rocker arm (2) Port for a connection for engine oil pressure (3) Engine oil supply to the magneto and governor drive (4) Camshaft bores (5) Piston cooling jets (6) Engine oil manifold (7) Engine oil supply to the governor drive (8) Engine oil cooler bypass valve (9) Engine oil filter bypass valve (10) Engine oil cooler (11) Engine oil filter (12) Engine oil pump (13) Engine oil sump | |
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| Illustration 3 | g00661059 |
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Lubrication system schematic (turbocharged engine) (1) Passage for engine oil through the rocker arm shaft to the rocker arm (2) Port for a connection for engine oil pressure (3) Engine oil supply for the turbocharger (4) Engine oil supply to the magneto and governor drive (5) Camshaft bores (6) Piston cooling jets (7) Engine oil manifold (8) Engine oil supply to the governor drive (9) Engine oil cooler bypass valve (10) Engine oil filter bypass valve (11) Engine oil cooler (12) Engine oil filter (13) Turbocharger (14) Engine oil pump (15) Engine oil sump | |
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| Illustration 4 | g00661134 |
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Engine oil lines for the turbocharger (1) Supply line (2) Return line | |
Engine Oil Flow Through the Engine Oil Filter and Engine Oil Cooler
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| Illustration 5 | g00661228 |
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Engine oil flow at normal operating engine temperature (1) Engine oil manifold in the cylinder block (2) Supply line for engine oil to the turbocharger (3) Engine oil filter (4) Engine oil filter bypass valve (5) Return line for engine oil from the turbocharger (6) Engine oil pump (7) Engine oil cooler bypass valve (8) Engine oil pan (9) Suction bell (10) Engine oil cooler | |
When the engine is at normal operating temperature, engine oil pump (6) pulls engine oil from engine oil pan (8) through suction bell (9). The engine oil is pumped to engine oil cooler (10). The engine oil flows through engine oil filter (3) to engine oil manifold (1) in the cylinder block and to supply line (2) for the turbocharger (if equipped). Engine oil from the turbocharger goes back through return line (5) to the engine oil pan.
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| Illustration 6 | g00661253 |
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Engine oil flow at cold engine operating temperature (1) Engine oil manifold in the cylinder block (2) Supply line for engine oil to the turbocharger (3) Engine oil filter (4) Engine oil filter bypass valve (5) Return line for engine oil from the turbocharger (6) Engine oil pump (7) Engine oil cooler bypass valve (8) Engine oil pan (9) Suction bell (10) Engine oil cooler | |
The engine oil filter base has two bypass valves that are designed to open at a differential pressure of
After the engine warms up, the differential pressure on the bypass valves decreases and the bypass valves close. The engine oil flows normally through the engine oil cooler and through the engine oil filter.
The bypass valves will also open if there is a restriction in the engine oil cooler or in the engine oil filter. This allows the engine to be lubricated if the engine oil cooler is plugged or if the engine oil filter is dirty.
The engine oil pump has a pressure relief valve that is designed to open at a pressure of
The engine oil manifold is the source of pressurized engine oil for the engine and for the attachments. The engine oil manifold provides engine oil through passages to these components: main bearings, timing gear bearings and bearings for the rocker arm shaft.
The flow of engine oil which goes to the main bearings is divided. Some of the engine oil provides lubrication between the main bearings and the bearing surfaces (journals) of the crankshaft. Some of the engine oil goes through the drilled passages into the crankshaft. This engine oil provides lubrication between the connecting rod bearings and the bearing surfaces (journals) of the crankshaft. The remainder of the engine oil goes out through orifices in the block near the main bearings. The engine oil provides cooling and a lubrication for these components: pistons, piston pins, piston rings and cylinder walls.
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| Illustration 7 | g00661377 |
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Engine oil supply for the rocker arm (1) Passage (2) Passage (3) Hollow dowel | |
Passage (1) from the rear of the cylinder block goes below the head bolt hole. Passage (1) connects to passage (2) that is drilled next to the head bolt hole. Hollow dowel (3) connects the passage in the cylinder block to the passage in the cylinder head. The hollow dowel fits through the spacer plate. The hole through the spacer plate is counterbored on both sides. O-ring seals in the counterbores around the hollow dowel prevent engine oil from leaking around the hollow dowel. Engine oil flows through the hollow dowel into a vertical passage in the cylinder head to the rocker arm shaft bracket. The rocker arm shaft has an orifice that restricts the flow of the engine oil to the rocker arm. The rear rocker arm bracket has O-ring seal (4) that seals against the head bolt. This seal prevents the engine oil from going around the head bolt and leaking past the head gasket. If you remove the head bolt from the rear rocker arm bracket, replace the O-ring seal.
Some of the engine oil lubricates the valve stems. The remainder of the engine oil drains from the cylinder head in order to lubricate the pushrods, the valve lifters, the camshaft, and the camshaft bearings.
The timing gear's bearings receive pressurized engine oil from the engine oil manifold through the drilled passages.
For components on the outside of the engine such as the turbocharger, engine oil goes through supply lines from the engine oil manifold.