3-148. LUBE OIL FILTER, HOSES AND HOUSING - MAINTENANCE INSTRUCTIONS.
a. The maintenance instructions for the lube oil filter, hoses and housing are contained in the following paragraphs:
Oil Filter - (Full Flow)
Oil Filter - (By-Pass) - Hoses and Housing
3-148.1. LUBE OIL FILTER (FULL FLOW) - MAINTENANCE INSTRUCTIONS.
a. The full-flow type lubricating oil filter is installed ahead of the oil cooler in the lubrication system.
b. The filter assembly consists of a replaceable element enclosed within a shell which is mounted on an adaptor.
When the filter shell is in place, the element is restrained from movement by a coil spring.
c. All of the oil supplied to the engine by the oil pump passes through the filter before reaching the various moving
parts of the engine. The oil is forced by pump pressure through a passage in the filter adaptor to the space surrounding
the filter element. Impurities are filtered out as the oil is forced through the element to a central passage surrounding the
center stud and out through another passage in the filter adaptor and then to the oil cooler.
d. A valve, which opens at approximately 18-21 psi (124-145 kPa), is located in the filter adaptor and will by-pass the
oil directly to the oil cooler should the filter become clogged.