Pistons, Connecting Rods - Onan MJA Series Service Manual

84 PISTONS, CONNECTING RODS, AND CYLINDERS
TROUBLE-SHOOTING CHART 9, PISTONS, CONNECTING RODS,
AND CYLINDERS
TROUBLE
POSSIBLE CAUSE REMEDY
Poor compression Loose cylinder heads.
Tighten.
Sticking rings.
Worn rings.
Replace rings, check
cylinder condition.
Worn cylinder walls
and pistons.
Leaky head gasket.
Refinish cylinders,
replace pistons.
~
Replace head gasket. .
Piston and cylin ­
der and ring wear
Operated with dirty air
cleaner.
Change air cleaner
service periods.
, .
~I----------------~--------------~
I
Air leak between air
. cleaner and engine. Repair leaks.
Faulty cylinder oil
control.
Check rings.
Engine run on low or
dirty oil.
Add or replace oil.
Check cause of loss.
If dirty, adjust
service periods.
Overheating.
See Trouble-Shooting
Chart 2.
Worn connecting
rod, bushings,
and bearings
Engine run with low oil.
Badly diluted, dirty or
wrong grade of oil.
Add oil, check cause
of oil loss.
Change oil. Check
cause of dilution. If
dirty, check service
periods.
\
li
Clogged oil passages.
Clean oil passages
and drillings.