Engine Mechanical System
Troubleshooting
In this manual: Engine Mechanical System
14steps
~84min
3/5difficulty
Done 0 of 14
Troubleshooting
| Symptom | Suspected Area | Remedy | |||
| Engine misfire with abnormal internal low engine noise. | Worn crankshaft bearings. Loose or damaged drive plate. |
Replace the crankshaft and bearings if necessary. Repair or replace the drive plate if necessary. |
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| Worn piston rings. (Oil consumption may or may not cause engine misfire.) |
Inspect the cylinder for loss of compression. Repair or replace if necessary. |
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| Worn crankshaft thrust bearings | Replace the crankshaft and bearings if necessary. | ||||
| Engine misfire with abnormal valve train noise. | Sticking valves. (Carbon on valve stem) |
Repair or replace if necessary. | |||
| Excessively worn or displaced timing chain. | Replace the timing chain and sprocket if necessary. | ||||
| Worn camshaft lobes. | Replace the camshaft and valve lifters. | ||||
| Engine misfire with coolant consumption. |
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| Engine misfire with excessive oil consumption. | Wear of valves, valve guides and/or valve stem seals. | Repair or replace if necessary. | |||
| Worn piston rings. (Oil consumption may or may not cause engine misfire.) |
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| Engine noise on start-up that lasts only a few seconds. | Incorrect oil viscosity. |
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| Excessive engine noise regardless of engine speed. | Low oil pressure. | Repair or replace if necessary. | |||
| Broken valve spring. | Replace the valve spring. | ||||
| Worn or dirty valve lifters. | Replace the valve lifters. | ||||
| Stretched or broken timing chain and/or damaged sprocket teeth. | Replace the timing chain and sprockets. | ||||
| Worn timing chain tensioner, if equipped. | Replace the timing chain tensioner if necessary. | ||||
| Worn camshaft lobes. |
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| Worn valve guides or valve stems. | Inspect the valves and valve guides, then repair if necessary. | ||||
| Stuck valves. Carbon deposits on the valve stem or valve seat may cause the valve to remain open. | Inspect the valves and valve guides, then repair if necessary. | ||||
| Worn drive belt, tensioner, idler and bearing. | Replace as necessary. | ||||
| Low engine noise regardless of engine speed. | Low oil pressure. | Repair as necessary. | |||
| Loose or damaged drive plate. | Repair or replace the drive plate. | ||||
| Damage to oil pan, contact with oil pump strainer. |
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| Oil pump strainer is loose, damaged, or clogged. |
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| Excessive piston-to-cylinder clearance. |
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| Excessive piston pin clearance. |
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| Excessive connecting rod bearing clearance | Inspect the following components and repair if necessary.
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| Excessive crankshaft bearing clearance. | Inspect the following components and repair if necessary.
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| Incorrect installation of piston, piston pin, and connecting rod |
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| Engine noise under load. | Low oil pressure | Repair or replace if necessary. | |||
| Excessive connecting rod bearing clearance. | Inspect the following components and repair if necessary:
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| Excessive crankshaft bearing clearance. | Inspect the following components and repair if necessary.
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| Engine does not crank, crankshaft does not rotate. | Hydraulic lock cylinder.
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| Timing chain breakage and/or timing chain and/or timing chain sprocket. |
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Foreign material in cylinder.
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| Seized crankshaft or connecting rod bearings. |
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| Bent or broken connecting rod. |
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| Broken crankshaft. |
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