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DESCRIPTION AND OPERATION
Cooling System
The cooling system incorporates a belt-driven
coolant pump integrated into the front of the
engine on the right. It also uses a piston-type
thermostat housed in the front of the cylinder
head and a fan with viscous drive mounted above
the crankshaft pulley. A coolant filter attached to
the pump housing filters impurities from the
coolant and can release supplemental coolant
additives for system protection.
COOLANT PUMP
The back of the coolant (water) pump, with its
ducts for distributing coolant, is a separate
casting attached to the cylinder block.
A housing containing an impeller, shaft seals,
bearing and pulley attaches to the mounting
plate. The bearing is a permanently lubricated
combination roller and ball bearing. Between the
shaft seals and the bearing, there is a ventilated
space which leads into a duct behind the pulley.
This allows leaks to be detected.
39
Figure 39 — Coolant (Water) System Components
1. Thermostat
2. Thermostat Housing
3. Coolant Pump Mounting Plate (with Angle Brace)
4. Coolant Pump Seal
5. Coolant Pump Housing
6. Coolant Pump Pulley
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