John Deere stx38 - 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.
● ● ● ● ● ● ●
Engine gaskets or seals
leaking.
● ● ● ● ● ● ● ● ● ● ● ●
Crankcase breather
restricted, reed valve
damaged, clearance
incorrect, or drain hole
plugged.
● ● ● ● ● ● ● ● ●
Valve guides or seals
worn or leaking. Valve
stems worn.
● ● ● ● ● ● ● ● ● ●
Worn, stuck, or broken
piston rings. Cylinder
bore worn. Check
compression and
vacuum.
● ● ● ● ● ● ● ● ● ● ● ●
Connecting rod or
crankshaft bearings
worn. Internal wear limits
out of specification.
● ● ● ● ● ● ● ●
Engine mounting
hardware loose or
broken.
● ● ●
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