Cylinder Cover, Exhaust Divider Plate And Exhaust Cover; Thermostat - Mercury 75 Service Manual

Cylinder Cover, Exhaust Divider Plate
and Exhaust Cover
Thoroughly clean cylinder cover and gasket sur-
faces.
Inspect cylinder cover. Check for cracks which
could cause water leakage.
Replace cylinder cover as necessary.
Thoroughly clean gasket surfaces of exhaust di-
vider plate and exhaust manifold cover.
Inspect exhaust divider plate and exhaust
manifold cover for grooves, cracks or distortion
that could cause leakage. Replace parts as
necessary.
a
b
a - Cylinder Cover
b - Divider Plate
c - Exhaust Cover
90-830234R3 DECEMBER 1997

Thermostat

Wash thermostat with clean water. Using a thermo-
stat tester, similar to the one shown, test thermostat
as follows:
c
Open thermostat valve, then insert a thread be-
tween valve and thermostat body. Allow valve to
close against thread.
Suspend thermostat (from thread) and thermom-
eter inside tester so that neither touches the con-
tainer. Bottom of thermometer must be even with
bottom of thermostat to obtain correct thermostat
opening.
Fill thermostat tester with water to cover
thermostat.
Plug tester into electrical outlet.
Observe temperature at which thermostat begins
to open. Thermostat will drop off thread when it
starts to open. Thermostat must begin to open
when temperature reaches 5_ F (3_ C) above
designated stamping on bottom of thermostat.
Continue to heat water until thermostat is com-
pletely open.
Unplug tester unit.
Replace thermostat, if it fails to open at the speci-
fied temperature, or if it does not fully open.
51087
POWERHEAD - 4-45