on the exterior of the engine to remove from the engine
3-14. Engine Oil Filter
oil any impurities and particles that could cause engine
wear. This filter has a replaceable cartridge.
The engine oil pressure is regulated by a
(1) Drain the oil from the engine (TM 5-
relief valve mounted in the engine cylinder block. The
4320-234-12, para 3-3).
valve consists mainly of a spring-loaded, spool-type
valve which is seated in a bore in the block. The greater
(2) Disconnect the electrical lead from the
the spring pressure is which loads the valve, the greater
oil pressure sender on the filter piping.
the oil pressure in the system.
The pressure is
increased by adding pressure-adjusting washers
(3) Remove the oil filter and related parts
between the spring and the valve to increase spring
from the engine as shown in figure 3-4.
force against the valve. Oil pressure adjustment is
described in paragraph 3-15.