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