TM 5-3820-245-14&P
LUBRICATING SYSTEM
Figure 7-11. Typical In-Line Engine Oil Filter Mounting
The Series 53 engine lubricating system, illustrated in Fig. 16, includes an oil intake screen and tube assembly, an oil
pump, a pressure regulator, a full-flow oil filter or bypass filter with bypass valve, and an oil cooler with a bypass valve.
Lubricating-oil from the pump passes from the lower front cover through short oil galleries in the cylinder block. From the
block, the oil flows to the full-flow oil filter, then through the oil cooler (if used) and back into the front engine cover and
cylinder block oil galleries for distribution to the various engine bearings. The drains from the cylinder head(s) and other
engine parts lead back to the oil pan.
Oil pressure is regulated by a pressure relief valve mounted in the engine front ,cover. Oil cooler and oil filter bypass
valves prevent the stoppage of oil flow if these items become plugged.
Each engine is equipped with a full-flow type lubricating oil filter (Fig. 14). If additional filtering is required, a bypass-type
oil filter may also be installed.
All of the oil supplied to the engine passes through the full-flow filter that removes the larger foreign particles without
restricting the normal flow of oil.
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