PROBLEM: WHITE OR BLUE EXHAUST GAS
PROBLEM: BLACK EXHAUST GAS
Solution
Inspect and replace
Check that the engine will reach full rpm in neutral; if it does get the propeller
checked / re-pitched if necessary.
Inspect and clean if required
Possible Cause
Blocked air filter element
Over pitched propeller - engine will
not reach its full rpm:
Accumulated debris on hull
16
Possible Cause
Engine oil level too high:
Blocked injector:
Piston ring and bore worn, giving a
low compression:
Check that the breather pipe is clear
and not obstructed:
Solution
Reduce the level.
Service injectors.
Get compression checked by your dealer or Kubota service agent. He will
advise action to be taken.
Remove and clean out.
PROBLEM: ERRATIC RUNNING
Possible Cause
Air in fuel supply:
Fuel lift pump faulty:
Clogged fuel filter:
Fuel return not fed back to the fuel
tank, or blocked pipe:
Air filter blocked:
Worn or blocked injector:
Engine rpm in gear is too low, this
must be 850 min:
Faulty stop solenoid:
Broken fuel injection pump spring:
Solution
Check supply system for leaks and fix.
Replace.
Replace.
Re-route pipe or clean.
Replace.
Service injectors.
Increase engine tick over speed.
Disconnect wiring to solenoid. If running improves check for a wiring fault.
Replace.
PROBLEM: LOW POWER OUTPUT
Possible Cause
Propeller is too big:
Check gearbox reduction ratio relative
to propeller size:
Solution
Change or depitch.
Change.
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