Symptom
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Suspect area
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Remedy
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Engine misfire with abnormal internal lower engine noises.
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Loose or improperly installed engine flywheel.
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Repair or replace the flywheel as required.
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Worn piston rings.
(Oil consumption may or may not cause the engine to misfire.)
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Inspect the cylinder for a loss of compression .
Repair or replace as required.
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Worn crankshaft thrust bearings.
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Replace the crankshaft and bearings as required.
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Engine misfire with abnormal valve train noise.
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Stuck valves.
(Carbon buildup on the valve stem can cause the valve not to close properly.)
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Repair or replace as required.
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Excessive worn or mis-aligned timing chain.
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Replace the timing chain and sprocket as required.
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Worn camshaft lobes.
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Replace the camshaft and MLA.
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Engine misfire with coolant consumption.
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• |
Faulty cylinder head gasket and/or cracking or other damage
to the cylinder head and engine block cooling system.
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• |
Coolant consumption may or may not cause the engine to overheat.
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• |
Inspect the cylinder head and engine block for damage to the
coolant passages and/or a faulty head gasket.
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• |
Repair or replace as required.
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Engine misfire with excessive oil consumption.
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Worn valves, valve guides and/or valve stem oil seals.
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Repair or replace as required.
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Worn piston rings.
(Oil consumption may or may not cause the engine to misfire)
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Inspection the cylinder for a loss of compression.
Repair or replace as required.
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Engine noise on start-up, but only lasting a few seconds.
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Incorrect oil viscosity.
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Drain the oil.
Install the correct viscosity oil.
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Worn crankshaft thrust bearing.
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Inspect the thrust bearing and crankshaft.
Repair or replace as required.
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Upper engine noise, regardless of engine speed.
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Low oil pressure.
|
Repair or replace as required.
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Broken valve spring.
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Replace the valve spring.
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Worn or dirty valve lifters.
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Replace the valve lifters.
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Stretched or broken timing chain and/or damaged sprocket teeth.
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Replace the timing chain and sprockets.
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Worn timing chain tensioner, if applicable.
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Replace the timing chain tensioner as required.
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Worn camshaft lobes.
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Inspect the camshaft lobes.
Replace the camshaft and valve lifters as required.
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Worn valve guides or valve stems.
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Inspect the valves and valve guides, then repair as required.
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Stuck valves. (Carbon on the valve stem or valve seat may cause the valve
to stay open.)
|
Inspect the valves and valve guides, then repair as required.
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Lower engine noise, regardless of engine speed.
|
Low oil pressure.
|
Repair or replace damaged components as required.
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Loose or damaged flywheel.
|
Repair or replace the flywheel.
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Damaged oil pan, contacting the oil pump screen.
|
Inspect the oil pan.
Inspect the oil pump screen.
Repair or replace as required.
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Oil pump screen loose, damaged or restricted.
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Inspect the oil pump screen.
Repair or replace as required.
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Excessive piston-to-cylinder bore clearance.
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Inspect the piston and cylinder bore.
Repair as required.
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Excessive piston pin-to-bore clearance.
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Inspect the piston, piston pin and the connecting rod.
Repair or replace as required.
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Excessive connecting rod bearing clearance.
|
Inspect the following components and repair as required.
• |
The connecting rod bearings.
|
• |
The crankshaft journal.
|
|
Excessive crankshaft bearing clearance.
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Inspect the following components and repair as required.
• |
The crankshaft bearings.
|
• |
The crankshaft journals.
|
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Incorrect piston, piston pin and connecting rod installation.
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Verify the piston pins and connecting rods are installed correctly.
Repair as required.
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Engine noise under load.
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Low oil pressure.
|
Repair or replace as required.
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Excessive connecting rod bearing clearance.
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Inspect the following components and repair as required.
• |
The connecting rod bearings.
|
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Excessive crankshaft bearing clearance.
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Inspect the following components and repair as required.
• |
The crankshaft bearings.
|
• |
The crankshaft journals.
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• |
The cylinder block crankshaft bearing bore.
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Engine will not crank. (crankshaft will not rotate)
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Hydraulically locked cylinder.
• |
Coolant/antifreeze in cylinder.
|
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Remove spark plugs and check for fluid.
Inspect for broken head gasket.
Inspect for cracked engine block or cylinder head.
Inspect for a sticking fuel injector and/or leaking fuel regulator.
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Broken timing chain and/or timing chain gears.
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Inspect timing chain and gears.
Repair as required.
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Foreign material in cylinder.
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Inspect cylinder for damaged components and/or foreign materials.
Repair or replace as required.
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Seized crankshaft or connecting rod bearings.
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Inspect crankshaft and connecting rod bearing.
Repair or replace as required.
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Bent or broken connecting rod.
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Inspect connecting rods.
Repair or replace as required.
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Broken crankshaft.
|
Inspect crankshaft.
Repair or replace as required.
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