TM 5-3805-281-24-2
Lubrication System
REMOVE, INSPECT, AND INSTALL OIL PRESSURE REGULATING VALVE, OIL FILTER
BYPASS VALVE, AND OIL COOLER BYPASS VALVE
Oil Filter Bypass Valve Spring--Specification
See OIL FILTER BASE AND OIL PRESSURE
REGULATING VALVE HOUSING ASSEMBLY and
Working Load....................................... 64--78 N (14--18 lb-force) at
ENGINE OIL COOLER ASSEMBLY, earlier in this
30.0 mm (1.18 in.)
group, for illustration of valves.
Free Length ........................................................... 44.0 mm (1.73 in.)
OIL PRESSURE REGULATING VALVE:
4. Dip all parts in clean engine oil; insert valve and
spring in filter base.
1. Remove plug (K), O-ring (J), spring (H), oil pressure
regulating valve (G) from housing (E). Discard
5. Install new O-ring on plug (O). Install plug and
O-ring.
tighten to 100 Nm (74 lb-ft).
2. Inspect valve and valve bore for damage. Replace
NOTE: Filter bypass valve operating pressure is
if necessary.
220 kPa (2.20 bar) (32 psi).
3. Check spring for proper compression. Replace
OIL COOLER BYPASS VALVE:
spring if not within specification.
1. Remove plug (L), O-ring (K), spring (J), and oil
Pressure Regulating Valve Spring--Specification
cooler bypass valve (I) from oil cooler cover/bypass
valve housing (A). Discard O-ring.
Working Load....................................... 66--74 N (15--17 lb-force) at
43.0 mm (1.69 in.)
2. Check housing for clogged passages and all other
Free Length ........................................................... 85.0 mm (3.35 in.)
parts for scale build-up.
4. Dip all parts in clean engine oil; insert valve and
3. Clean all parts with a stiff bristle brush and solvent,
spring in housing.
if necessary. Dry with compressed air.
5. Install plug (K) using a new O-ring and tighten to
4. Inspect bypass valve for damage. Replace if
100 Nm (74 lb-ft).
necessary.
NOTE: Pressure regulating valve starts to operate at
340 kPa (3.4 bar) (49 psi).
5. Check bypass valve spring for proper specifications.
Replace spring if not within specification.
OIL FILTER BYPASS VALVE:
Oil Cooler Bypass Valve Spring--Specification
1. Remove plug (O) with O-ring (N), spring (M), and
Working Load....................................... 64--78 N (14--18 lb-force) at
oil filter bypass valve (L) from oil filter base (A).
30.0 mm (1.18 in.)
Discard O-ring.
Free Length ........................................................... 44.0 mm (1.73 in.)
2. Inspect valve and housing bore for scoring or
damage. Replace if necessary.
3. Check spring for proper compression. Replace
spring if not within specification.
Continued on next page
RG,RG34710,1220
1923OCT971/2
