Insufficient Power - Xinchai 490B Series Manual

6.6 Insufficient power

Cause of trouble
Air filter chocked
Fuel filter or filter screen of
fuel supply pump chocked
Uneven injection
Low compression pressure or
poor atomization
Incorrect injection timing
Injection pump elements
worn
The distorted and loosed
governor spring fails to reach
the rated speed
Air enters fuel system
Valve leakage
Low compression pressure
Incorrect valve timing
40
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Remedies
Check and repair injection pump elements
Adjust fuel delivery quantity and repair broken
Adjust and replace the governor spring
Check valve clearance, valve spring force, valve
guide wear and valve sealing condition; change
faulty parts or lap valve with its seat if necessary
Clean or change it
Clean or replace
Adjust to make even
Adjust as specified
parts
Eliminate the air
See item 6.1
Change camshaft if necessary