POWERHEAD
90-855347R1 JANUARY 1999 Page 4A-35
IMPORTANT: Clean connecting rod just enough to clean up bearing surfaces. DO
NOT continue to clean after marks are removed from bearing surfaces.
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c. Clean PISTON PIN END of connecting rod, using same method as in Step “b”,
preceding, but using 320 grit carborundum cloth instead of crocus cloth.
d. Thoroughly wash connecting rods to remove abrasive grit. Recheck bearing sur-
faces of connecting rods. Replace any connecting rod(s) that cannot be properly
“cleaned up.” Lubricate bearing surfaces of connecting rods (which will be
re-used) with light oil to prevent rust.
Thermostats
1. Inspect thermostat covers and cylinder head covers (thermostat opening) for cracks
and corrosion damage that could cause leakage. Replace parts as necessary.
2. Remove and discard gasket from each thermostat.
3. Wash thermostats with clean water.
4. Using a thermostat tester, similar to the one shown, test each thermostat as follows:
a. Open thermostat valve, then insert a thread between valve and thermostat body.
Allow valve to close against thread.
b. Suspend thermostat (from thread) and thermometer inside tester so that neither
touches the container. Bottom of thermometer must be even with bottom of ther-
mostat to obtain correct temperature of thermostat opening.
c. Fill thermostat tester with water to cover thermostat.
d. Plug tester into electrical outlet.
e. Observe temperature at which thermostat begins to open. (Thermostat will drop
off thread, that was installed in Step “a”, when it starts to open.) Thermostat must
begin to open when temperature reaches 140°-145° F (60°-63° C).
f. Continue to heat water until thermostat is completely open.
g. Unplug thermostat tester.
h. Replace thermostat, if it fails to open at the specified temperature, or if it does not
fully open.
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