OMCB10004

Symptom	Problem	Solution
Hard to Start or Will Not Start		See earlier in this section.

Engine Misfiring or Runs Irregularly

See earlier in this section.

Black or Grey Exhaust Smoke

See earlier in this section.

Lack of Engine Power

See earlier in this section.

Turbocharger “Screams”

Air leak in intake manifold.

Check intake manifold gasket and manifold; repair as required. See your John Deere engine distributor or servicing dealer.

Turbocharger Noise or Vibration NOTE: Variable geometry turbocharger recycles after starting engine, causing a momentary revving sound in the engine. This is normal. Do not confuse the whine heard during run down with noise which indicates a bearing failure.	Bearings not lubricated (insufficient oil pressure)	Determine cause of lack of lubrication; repair as required. See your John Deere engine distributor or servicing dealer.
	Air leak in engine intake or exhaust manifold	Check intake and exhaust manifold gaskets and manifolds; repair as required. See your John Deere engine distributor or servicing dealer.
	Improper clearance between turbine wheel and turbine housing	Inspect turbocharger; repair/replace as required. See your John Deere engine distributor or servicing dealer.
	Broken blades (or other wheel failures)	Inspect turbocharger; repair/replace as required. See your John Deere engine distributor or servicing dealer.

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