OMHXE51478

Engine

Symptom	Problem	Solution
Engine Will Not Crank	Weak battery	Charge or replace battery.
	Corroded or loose battery connections	Clean battery terminals and connections.
	Defective main switch or start safety switch	Repair switch as required.
	Starter solenoid defective	Replace solenoid.
	Starter defective	Replace starter.

Engine Hard to Start or Will Not Start	Starting system problem	Starting system not strong enough to start engine Perform steps found in Engine Will Not Crank.
	Poor fuel quality	Drain fuel and replace with quality fuel of the proper grade.
	Slow cranking speed	Check for problem in the charging/starting system.
	Too high viscosity crankcase oil	Drain crankcase oil and replace with correct viscosity oil.
	Electronic control system problem or basic engine problem	See your John Deere dealer.

Engine Misfiring or Runs Irregularly	Poor fuel quality	Drain fuel and replace with quality fuel of the proper grade.
	Electronic control system problem or basic engine problem	See your John Deere dealer.

Lack of Engine Power	Poor fuel quality	Drain fuel and replace with quality fuel of the proper grade.
	Plugged fuel filter	Replace fuel filters.
	Engine overloaded	Reduce engine load.
	Improper crankcase oil	Drain crankcase oil and replace with correct viscosity oil.
	Electronic control system problem or basic engine problem	See your John Deere dealer.
	Engine is in derate because of an active diagnostic trouble code	See your John Deere dealer.
	Engine is in derate because exhaust filter cleaning is required.	Engage exhaust filter auto cleaning mode and request a manual exhaust filter cleaning.

Engine Emits Black or Gray Smoke	Engine overloaded	Reduce engine load.
	Improper type of fuel.	Use proper fuel.
	Air cleaner restricted or dirty	Replace air cleaner element as required.
	Defective muffler/exhaust piping (causing backpressure)	Replace muffler or defective piping.
	Electronic control system problem or basic engine problem	See your John Deere dealer.
	Fuel injectors dirty.	See your John Deere dealer.
	High-pressure fuel pump out of time.	See your John Deere dealer.
	Turbocharger not functioning.	See your John Deere dealer.
	Exhaust filter is cracked or damaged.	See your John Deere dealer.

Engine Emits White Smoke	Engine compression too low	Determine cause of low compression and repair as required. See your John Deere dealer.
	Improper type of fuel.	Use proper fuel.
	Low engine temperature.	Warm up engine to normal operating temperature.
	Defective thermostat(s)	Test thermostats; replace thermostats as required.
	Coolant entering combustion chamber (failed cylinder head gasket or cracked cylinder head)	Repair or replace as required. See your John Deere dealer.
	Electronic control system problem or basic engine problem	See your John Deere dealer.
	Defective fuel injectors.	See your John Deere dealer.
	High-pressure fuel pump out of time.	See your John Deere dealer.

Engine Idles Poorly	Poor fuel quality	Drain fuel and replace with quality fuel of the proper grade.
	Air leak on suction side of air intake system.	Check hose and pipe connections for tightness; repair as required.
	Electronic control system problem or basic engine problem	See your John Deere dealer.

Excessive Fuel Consumption	Poor fuel quality	Drain fuel and replace with quality fuel of the proper grade.
	Engine overloaded	Reduce engine load.
	Air cleaner restricted or dirty	Replace air cleaner element as required.
	Compression too low	Determine cause of low compression and repair as required.
	Leaks in fuel supply system	Locate source of leak and repair as required.
	Improper type of fuel.	Use proper type of fuel.
	Poor fuel quality	Drain fuel and replace with quality fuel of the proper grade.
	Improper valve clearance.	See your John Deere dealer.
	Fuel injectors defective.	See your John Deere dealer.
	High-pressure fuel pump out of time.	See your John Deere dealer.
	Improper turbocharger operation.	Inspect turbocharger. See your John Deere dealer.
	Low engine temperature.	Check thermostats.

Fuel in Oil	Cracked cylinder head	Locate crack, repair/replace components as required. See your John Deere dealer.
	Cracked or worn electronic unit injector O-ring	Remove suspected electronic unit injector and replace O-ring as required. See your John Deere dealer.

Low Fuel Pressure	Plugged fuel filter	Replace fuel filter.
	Restricted fuel line	Locate restriction, repair as required.
	Faulty fuel transfer pump	Remove fuel transfer pump; repair/replace pump as required. See your John Deere dealer.

Fuel Aeration	Electronic unit injector hold-down clamp loose	Tighten hold-down clamp cap screw to proper torque. See your John Deere dealer.
	Cracked or worn electronic unit injector O-ring	Remove suspected electronic unit injector and replace O-ring as required. See your John Deere dealer.

Low Oil Pressure	Low crankcase oil level	Fill crankcase to proper oil level.
	Crankcase oil level too high	Fill crankcase to proper oil level.
	Faulty pressure sensor	Replace sensor. See your John Deere dealer.
	Clogged oil cooler or filter	Remove and inspect oil cooler. See your John Deere dealer.
	Excessive oil temperature	Remove and inspect oil cooler. See your John Deere dealer.
	Defective oil pump	Remove and inspect oil pump. See your John Deere dealer.
	Incorrect oil	Drain crankcase and refill with correct oil.
	Oil pressure regulating valve failure	Remove and inspect oil pressure regulating valve. See your John Deere dealer.
	Broken piston spray nozzle	Replace piston spray nozzle. See your John Deere dealer.
	Clogged oil pump screen or cracked pick-up tube	Remove oil pan and clean screen/replace pick-up tube.
	Excessive main or connecting rod bearing clearance	Determine bearing clearance. See your John Deere dealer.

High Oil Pressure	Improper oil classification	Drain crankcase and refill with correct oil.
	Faulty pressure sensor	Replace sensor. See your John Deere dealer.
	Oil pressure regulating valve bushing loose (wanders)	Remove and inspect oil pressure regulating valve. See your John Deere dealer.
	Improperly operating regulating valve	Remove and inspect oil pressure regulating valve. See your John Deere dealer.
	Plugged piston spray nozzle	Replace piston spray nozzle. See your John Deere dealer.
	Stuck or damaged filter bypass valve	Remove and inspect filter bypass valve. See your John Deere dealer.
	Stuck or damaged oil cooler bypass valve	Remove and inspect oil cooler bypass valve. See your John Deere dealer.

Excessive Oil Consumption	Too low viscosity crankcase oil	Drain crankcase and refill with correct viscosity oil.
	Crankcase oil level too high	Drain oil until oil level is correct.
	External oil leak(s)	Determine source of oil leak(s) and repair as required.
	Oil control rings not seated	See your John Deere dealer.
	Oil control rings worn or broken	Replace piston rings. See your John Deere dealer.
	Scored cylinder liners or pistons	Remove and inspect cylinders and liners; replace as required. See your John Deere dealer.
	Worn valve guides or stems	Inspect and measure valve stems and valve guides; repair as required. See your John Deere dealer.
	Excessive oil pressure	See High Oil Pressure earlier in this section.
	Piston ring grooves excessively worn	Remove and inspect pistons. See your John Deere dealer.
	Piston rings sticking in ring grooves	Remove and inspect pistons. See your John Deere dealer.
	Insufficient piston ring tension	Remove and inspect pistons. See your John Deere dealer.
	Piston ring gaps not staggered	Remove and inspect pistons. See your John Deere dealer.
	Front and/or rear crankshaft oil seal faulty	Replace oil seals. See your John Deere dealer.

Abnormal Engine Noise ¹	Worn main or connecting rod bearings	Determine bearing clearance. See your John Deere dealer.
	Excessive crankshaft end play	Check crankshaft end play. See your John Deere dealer.
	Loose main bearing caps	Check bearing clearance; replace bearings and bearing cap screws as required. See your John Deere dealer.
	Worn connecting rod bushings and piston pins	Inspect piston pins and bushings. See your John Deere dealer.
	Scored pistons	Inspect pistons. See your John Deere dealer.
	Worn timing gears or excess backlash	Check timing gear backlash. See your John Deere dealer.
	Excessive valve clearance	Check and adjust valve clearance. See your John Deere dealer.
	Worn camshaft lobes	Replace camshaft. See your John Deere dealer.
	Worn rocker arm shaft(s)	Replace rocker arm shafts. See your John Deere dealer.
	Insufficient engine lubrication	See Lubrication System Troubleshooting, later in this section.
	Turbocharger noise	See Air Intake System Troubleshooting, later in this section.

Turbocharger “Whistles”

Air leak in intake manifold.

Check intake manifold gasket and manifold; repair as required. See your John Deere dealer.

Turbocharger Noise or Vibration ¹	Bearings not lubricated (insufficient oil pressure)	Determine cause of lack of lubrication; repair as required. See your John Deere dealer.
	Air leak in engine intake or exhaust manifold	Check intake and exhaust manifold gaskets and manifolds; repair as required. See your John Deere dealer.
	Improper clearance between turbine wheel and turbine housing	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Broken blades (or other wheel failures)	Inspect turbocharger; repair/replace as required. See your John Deere dealer.

Oil on Turbocharger Compressor Wheel or in Compressor Housing (Oil Being Pushed or Pulled through Center Housing)	Excessive crankcase pressure.	Determine cause of excessive crankcase pressure; repair as required. See your John Deere dealer.
	Air intake restriction	Determine cause of intake restriction; repair as required. See your John Deere dealer.
	Drain tube restriction	Determine cause of drain tube restriction; repair as required. See your John Deere dealer.

Oil in Intake Manifold or Dripping from Turbocharger Housing	Excessive crankcase pressure	Determine cause of excessive crankcase pressure; repair as required. See your John Deere dealer.
	Air intake restriction	Determine cause of intake restriction; repair as required. See your John Deere dealer.
	Drain tube restriction	Determine cause of drain tube restriction; repair as required. See your John Deere dealer.
	Damaged or worn housing bearings	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Unbalance of rotating assembly	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Damage to turbine or compressor wheel or blade	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Dirt or carbon build-up on wheel or blade	Check for air intake leaks (post air filter). Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Bearing wear	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Oil starvation or insufficient lubrication	Determine cause of lack of lubrication; repair as required. See your John Deere dealer.
	Shaft seals worn	Inspect turbocharger; repair/replace as required. See your John Deere dealer.

Turbocharger Turbine Wheel Drag	Carbon build-up behind turbine wheel caused by coked oil or combustion deposits	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Dirt build-up behind compressor wheel caused by air intake leaks	Inspect turbocharger; repair/replace as required. See your John Deere dealer.
	Bearing seizure or dirty, worn bearings	Inspect turbocharger; repair/replace as required. See your John Deere dealer.

Engine Overheats	Engine overloaded.	Reduce engine load.
	Low coolant level.	Fill cooling system to proper level, check radiator, and hoses for loose connections or leaks.
	Defective surge tank cap	Replace surge tank cap as required.
	Loose or defective fan belt	Replace fan belt as required. Check belt tensioner.
	Low engine oil level.	Check oil level. Add oil as required.
	Cooling system needs flushing.	Flush cooling system.
	Defective thermostat(s)	Remove and check thermostats as required.
	Defective temperature gauge or sender.	Check coolant temperature with thermometer and replace, if necessary.
	Incorrect grade of fuel.	Use correct grade of fuel.
	Radiator core dirty	Clean radiator as required.
	Too low crankcase oil level	Fill crankcase to proper oil level.
	Damaged cylinder head gasket	Replace cylinder head gasket. See your John Deere dealer.
	Defective coolant pump	Replace coolant pump. See your John Deere dealer.

Coolant in Crankcase	Cylinder head gasket defective	Replace cylinder head gasket. See your John Deere dealer.
	Cylinder head or block cracked	Locate crack, repair/replace components as required.
	Cylinder liner seals leaking	Remove and inspect cylinder liners. See your John Deere dealer.
	Leaking oil cooler	Pressure test oil cooler; repair/replace as required. See your John Deere dealer.
	Defective oil cooler O-rings	Remove and inspect oil cooler O-rings; replace as required. See your John Deere dealer.
	Faulty coolant pump seal; weep hole plugged; coolant leaking through bearing	Replace coolant pump seals. See your John Deere dealer.

Coolant Temperature Below Normal

Defective thermostat(s)

Test thermostats; replace thermostats as required.

¹ NOTE: Variable geometry turbocharger recycles after starting engine, causing a momentary revving sound in engine. This is normal. Do not confuse whine heard during run down with noise which indicates a bearing failure.

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