TM 5-3825-229-14&P
5-12. OIL PUMP AND OIL PRESSURE REGULATING VALVE (cont)
d.
Oil Pressure Requlatinq Valve (cont).
(2)
Cleaning, Inspection and Repair (cont).
(a)
Clean all regulating valve parts in cleaning solvent (PD-680) and dry thoroughly.
(b)
Inspect piston for nicks, scoring and wear. Replace piston if it shows indication of
nicks, scoring or wear.
(c)
Check free length of spring. Minimum free length of spring is 3.37 inch (85.6 mm).
(d)
Use a valve spring tester (5) to test spring tension of spring (3). Compress the spring
to a height of 2.08 inch (52.9 mm).
(e)
Minimum spring tension at this height is 12 Ib-ft (54 Nm). Maximum spring tension
is 14 Ib-ft (62 Nm).
(f)
Replace spring if spring is cracked or damaged and if it does not comply with
free
length and tension specifications listed above.
(3)
Installation.
(a)
Apply a light coat of lubricant (OE/HDO) to piston (4), spring (3) and washer (2).
(b)
Install piston (4) in bore of crankcase. Piston should slide smoothly into crankcase
bore.
(c)
Install spring (3) and washer (2) in bore. Use a suitable drift and compress spring to
move washer above spring pin hole.
(d)
Drive the spring pin (1) into crankcase until pin is flush with surface of crankcase.
(e)
Refer to para. 5-11 and install oil pan.
5-36
