Mercury 225 EFI - Thermostats (120 F) (49 C)

POWERHEAD
90-884294 OCTOBER 2001 Page 4A-55
7. Uneven Wear: Uneven wear could be caused by a bent connecting rod.
a
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a
a-Uneven Wear Between Arrows
8. If necessary, clean connecting rod bearing surfaces, as follows:
a. Be sure that “etched” marks on connecting rod (crankshaft end) are perfectly aligned
with “etched” marks on connecting rod cap. Tighten connecting rod cap attaching
bolts securely.
CAUTION
Crocus cloth MUST BE USED to clean bearing surface at crankshaft end of connect-
ing rod. DO NOT use any other type of abrasive cloth.
b. Clean CRANKSHAFT END of connecting rod by using CROCUS CLOTH placed
in a slotted 3/8 in. (9.5 mm) diameter shaft, as shown. Chuck shaft in a drill press
and operation press at high speed while keeping connecting rod at a 90° angle to
slotted shaft.
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”, pre-
ceding, 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 (120°F) (49°C)
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. Al-
low 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 thermo-
stat to obtain correct temperature of thermostat opening.
c. Fill thermostat tester with water to cover thermostat.