b. Disassembly. Disassemble the oil filter as
Cleaning and Inspection.
shown in figure 3-11.
(1) Discard and replace the oil filter
element and gaskets.
(2) Clean all remaining parts with cleaning
solvent (FED. Spec. P-D-680).-Blow out tubes and
hoses with compressed air.
(3) Inspect the hose for abrasion, cracks,
deterioration, damaged threaded ends, and collapsed
walls; replace a damaged hose.
(4) Inspect the tube for dents, cracks,
damaged tube nuts, and collapsed walls; replace a
(5) Inspect the filter body and cover for
cracks, distortion, dents, damaged threads, and other
damage; replace a damaged body or cover.
(6) Inspect the oil pressure sender for
cracks, dents, and damaged threads. Connect the
sender to a calibrated variable pressure air supply and
connect an ohmmeter across the electrical terminal and
ground of the sender. At zero air pressure resistance
through the sender must be zero ohms. Increase air
pressure in increments and check for the following
Ohms ± 10%
(7) Inspect all other parts for cracks,
distortion, and damaged threads. Replace damaged
d. Reassembly and Installation, Reassembly
and installation are the reverse of removal and
installation, start the engine and check for oil leaks.
Correct any leaks.
Figure 3-11. Engine oil filter, exploded view.
3-12. Engine Oil Pressure Safety Switch
(1) Disconnect the electrical leads from the
oil pressure safety switch. Tag leads to facilitate
(2) Disconnect the hose (5, fig. 3-9) and
the elbows (6 and 7i from the engine and from the oil
pressure safety' switch.
(3) Remove the oil pressure safety switch.
Refer to items 8 through 11 in figure 3-9.
b. Cleaning and Inspection.
(1) Clean the oil pressure safety switch with
a cloth dampened with cleaning solvent (FED. Spec.
P-D-680); dry thoroughly.
(2) Clean all remaining parts with solvent.