4-14
Replacing the Thermostat
See Table 4-1 for scheduled replacement. Refer-
ring to Figure 4-9, replace the thermostat as follows:
1. Disconnect the negative (−) cable at the battery
to prevent the engine from starting, let the en-
gine cool and remove the front and back access
doors if the genset has an enclosure.
WARNING
ACCIDENTAL OR REMOTE
STARTING can cause severe personal inju-
ry or death. Disconnect the negative (−)
cable from the battery to prevent the engine
from starting.
HOT COOLANT is under pressure and can
cause severe burns when loosening the
pressure cap. Let the engine cool before
loosening the pressure cap.
2. Remove the coolant pressure cap.
3. Remove the two thermostat housing bolts and
pull off the housing, thermostat and gasket. The
hose does not need to come off.
4. Clean off the gasket area and install the new
thermostat and gasket. Apply Three Bond 1215
liquid sealant or equivalent to the top side of the
gasket.
5. Replenish any lost coolant, secure the pres-
sure cap and any doors and panels removed
and reconnect the battery cables (negative [−]
last).
THERMOSTAT
FIGURE 4-9. TYPICAL THERMOSTAT
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