Xinchai 490B Series Manual page 50

6.11 Speed going up out of control
Cause of trouble
Governor fly-ball holder
seized at low speed position
Governor control lever
locked at high speed position
Governor arm gets out from
the shifting yoke
Great amount of oil enters
combustion chamber
Contact with Xinchai service
station
6.12 Engine shutting down automatically
Cause of trouble
Seized piston or crankshaft journal
Air trapped in fuel system causing
chocked fuel passage, or faulty fuel
supply pump or chocked fuel filter
Seized delivery valve of injection
pump or governor fly-ball holder, or
broken plunger spring
Contact with Xinchai service station
46
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Remedies
Repair the governor and the tension rod
Reduce the oil as mentioned above
Remedies
Release trapped air, repair fuel supply
pump or clean up fuel filter
Repair
Repair
Repair
Repair or replace