TM 5-3825-226-24
LUBRICATION SYSTEM
SCHEMATIC OF LUBRICATION SYSTEM
1. Vacuum pump or air compressor. 2. Cylinder head. 3. Front cover for the engine. 4. 011 manifold. 5. Base for
the oil cooler. 6. O01 pump bypass valve. 7. Oil cooler. 8. Oil pump. 9. Cover for oil pump. 10. Suction bell or oil
pump. 11.0il cooler bypass valve. 12. Oil filter bypass valve. 13. Oil filters.
The lubrication system uses a six lobe, rotor type oil
pump (8). Bolts hold the cover for the oil pump (9) on
the front cover for the engine (3). The gear on the
crankshaft drives the outer rotor. The outer rotor has
rotation in a bearing in the front cover for the engine.
The inner rotor goes on a short shaft in the front cover
for the engine. The inner rotor is driven by the outer
rotor.
Oil pump bypass valve (6), in the cover for the oil pump
(9), controls the pressure of the oil coming from oil
pump (8). The pump can put more oil into the system
than needed. When the pressure of the oil going into
the engine is more than 75 to 85 psi (520 to 590 kPa),
the bypass valve (6) will open. This permits the oil that
is not needed to bypass the system.
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