Section 4.2- water pump and thermostat, Water pump, Thermostat – Generac 86640 User Manual

Page 54

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Section 4.2- WATER PUMP AND THERMOSTAT

Water Pump

The engine water pump (Figure 3) cannot be disassem-

bied and must be replaced as a unit. Check the [pump for
excessive end play and smoothness of rotation. Bolt holes
are drilled through the water jacket in the cylinder block. Use
a sealant and tighten the bolts to the recommended torque.
After installation, operate the engine and check for leaks.

Thermostat

Check the thermostat for proper seating at ambient tem

perature. It should seat tightly. Check its opening temperta-
ture and lift.

VALVE OPENING TEMPERATURE

190* F. (88* C.)

MAXIMUM VALVE LIFT

0.31 Inch at 212’ F. (8mm at 100* C.)

After installing the thermostat, run the engine and check

for leaks.

Figure 5. Testing the Thermostat

Figure 3. Engine Water Pump

■ Water pump assembly

Page 4.2-1