Onan MJA Series Service Manual page 81

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CYLINDER HEADS AND V ALVES
TROUBLE-SHOOTING CHARTS, CYLINDER HEADS AND VALVES
(ConL)
TROUBLE POSSIBLE CAUSE
RElVIEDY
Valve burning
(Cont. )
Improper COOling of valve
seats or guides due to
clogged COOling system.
Refer to Sect 3. Ll.
Maintenance
Coked or gummed oil on
stem.
C lean or replace
valve.
. Sticking valves
Incorrect valve clearance.
Adjust valve
clearance.
Weak or broken springs.
Replace springs.
Dirty, scored or
gummy guides.
Clean or replace
valves and guides.
Incorrect clea.rance
between valve and guide.
Correct clearance.