Onan MJA Series Service Manual page 29

27 COOLING SYSTEM
TROUBLE-SHOOTING CHART 2, COOLING SYSTEM (Cont.)
[
TROUBLE POSSIBLE CAUSE REMEDY
I
Premature rubber ! Continued operation with
impeller failure
with dirty or silted
(under 500 hours
cooling water.
of operation)
(ConL)
i
Loss of COOling Expansion tank pressure
Replace.
water* in fresh
cap defective.
water system*
Centrifugal water pump
seals defective.
Blown head gasket. Replace gasket.
~
. .
* - Heat Exchanger Models Only.