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NOTE:
Drive pulley not shown.
Thermostat Removal
The thermostat is mounted inside a housing on the back of the cylinder
head next to the distributor.
1.
Drain the coolant.
2.
Remove the hose from thermostat housing to heat exchanger.
3.
Remove thermostat cover housing and bolts.
4.
Remove thermostat.
S.
Remove housing gasket.
Checking Thermostat
A thermostat can be checked for proper operation by placing it in a
pan of cold water and then raising the temperature of the water to a
boil.
The thermostat should open noticeably (with travel on the order
of 1/4
n -
1/2") and be fully opened when the water is boiling.
Thermostat Installation
1.
Install in reverse order using
a new housing gasket coated on
both sides with gasket cement.
NOTE:
Insure
that
the
small
vent hole in the thermostat is
at the 12 o'clock position when
the thermostat is installed.
2.
Replenish the coolant and start
the engine and check that there
are no leaks.
Engine Coolant
It is recommended that an antifreeze mixture be used in the engine
fresh water cooling system.
An Ethylene - Glycol base antifreeze only
should be used.
The mixture should be according to the manufacturer's
instructions.
Rust and scale inhibitors should be added if not found
in the antifreeze used.
Filling and Draining Fresh Water System
Draining system coolant:
Two points on the engine fresh water cooling
system should be opened to drain fresh water coolant from the engine
block, manifold and exchanger.
69
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