4A-32 - POWERHEAD 90-824052R3 JUNE 2002
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 surfaces 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 ther-
mometer inside tester so that neither touches
the container. Bottom of thermometer must
be even with bottom of thermostat 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.
NOTE: BE SURE that water in thermostat tester is
allowed to cool sufficiently [below 130
°
F (56
°
C)]
before testing the other thermostat.
51087
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