John Deere stx38 User Manual
Page 43
4/23/97
3 - 11
ENGINE
TROUBLESHOOTING
Continued on next page
Engine oil viscosity or
level incorrect. Engine
oil filter restricted. Oil
pump worn or passages
obstructed.
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Engine gaskets or seals
leaking.
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Crankcase breather
restricted, reed valve
damaged, clearance
incorrect, or drain hole
plugged.
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Valve guides or seals
worn or leaking. Valve
stems worn.
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Worn, stuck, or broken
piston rings. Cylinder
bore worn. Check
compression and
vacuum.
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Connecting rod or
crankshaft bearings
worn. Internal wear limits
out of specification.
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Engine mounting
hardware loose or
broken.
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Problem or
Symptom
Engine cranks but will not
start or starts hard
Engine will not stay running or
runs rough
Engine stalls frequently
Engine backfires
Engine surges, uneven or
uncontrolled rpm
Engine misses
Low power under load
Engine has no spark
Engine will not crank
Exhaust black, engine
floods or burns rich
Exhaust smoke blue or high
oil consumption
Engine has low oil pressure
Fuel in oil
Engine overheats
Excessive engine noise or
vibration start or starts hard
Check or
Solution