ENGINE MECHANICAL SERVICE MANUAL NUMBER 22
Page 3A-92 90-860074--1 FEBRUARY 2002
6. Refer to appropriate procedures to continue engine disassembly if rebuilding, or
proceed if only oil thermostat or adapter and related parts are being serviced.
Disassembly
1. Remove hex head plug with sealing washer, O-ring, spring and thermostat from filter
head.
75528
a
b
c
d
e
f
a-Thermostat
b-Spring
c-O-ring Seal
d-Sealing Washer
e-Hex Head Plug
f-Adapter / Oil Thermostat
Cleaning and Inspection
2. Clean parts in solvent.
3. Dry with compressed air.
4. Inspect components for cracks or damage. Replace as needed. Refer to Testing to verify
if thermostat is functional.
Testing
NOTICE
Read WARNING about testing in Precautions at the front of this SECTION before pro-
ceeding with tests.
1. Thermostat pin should be retracted as shown when cold. If not, thermostat is faulty and
must be replaced.
71085
a
b
a-Thermostat
b-Thermostat Pin (Retracted)
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