b. Cleaning and Inspection.
Dry cleaning solvent P-D-680 is potentially dangerous.
Avoid repeated and prolonged breathing of vapors and skin
contact with the liquid. Do not use near open flame, arcing
equipment or other ignition sources. Al- ways wear eye
protection and protective clothing. The flash point of P-D-
680 is 100 to 138 deg. F (38 to 59 deg. C).
Death or serious injury could occur if compressed air is
directed against the skin. Do not use compressed air
for cleaning or drying unless the pressure is/has been
reduced to 30 psi (2.11 kg/cm2) or less. When working
with compressed air, always use chip guards eye
protection and other personal protective equipment.
(1) Clean ail parts in solvent (Item 3, Appendix E) and dry thoroughly with compressed air.
(2) Check fit of valve (9) in body (6). Valve must move freely in body. If valve or bore in body is scored or
damaged, replace parts.
(3) Inspect spring (8) for pitted or fractured condition. Replace damaged springs.
(1) Apply clean engine oil (item 20, Appendix E) to the outer face of the valve (9). Install flatwasher (8A)
into valve (9) (for pressure regulator valve only). Slide valve into body (5), closed end first.
Install pin (5) in hole A for pressure regulator valve and in hole B
for pressure relief valve.
(2) Install spring (8) and seat (7) into body. Depress seat (7) into body to compress spring and insert
pin (5) behind seat to secure parts in body. Press the pin flush to 0.01 0 in. (0.25 mm) below surface of
(3) Remove all traces of oil gasket material from body and cylinder block. Install new gasket (4) on block.
(4) Install oil pressure regulator valve assembly (3) or oil pressure relief valve assembly (3A) on cylinder
block and secure with two washers (2) and screws (1).
d. Follow-on Maintenance.
(1) Install oil pan (see para 5-27).
(2) Connect batteries (see para 4-114).