Condition
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Actions
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Abnormalities (server cracking, bumps or missing areas) in the
accessory drive belt
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Abnormalities in the accessory drive belt and/or components may
cause engine RPM variations, noises similar to faulty lower engine
and also lead to a misfire condition. A misfire code may be present
without an actual misfire condition.
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1. |
Inspect the accessory drive components. |
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2. |
Repair or replace all damaged components. |
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Worn, damaged, or misaligned accessory drive components or
excessive pulley runout
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A misfire code may be present without an actual misfire
condition.
|
1. |
Inspect the accessory drive components. |
|
2. |
Repair or replace all damage components. |
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Loose and/or damaged crankshaft pulley
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A misfire code may be present without an actual misfire
condition.
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1. |
Repair or replace all damaged components. |
|
2. |
Inspect crankshaft pulley and pulley bolt. |
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Loose torque converter bolts
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A misfire code may be present without an actual misfire
condition.
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1. |
Inspect torque converter bolts and flywheel. |
|
2. |
Repair or replace all damaged components. |
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Loose and/or damaged flywheel
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A misfire code may be present without an actual misfire
condition.
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1. |
Inspect flywheel and flywheel attaching
bolts. |
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2. |
Repair or replace all damaged components. |
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Excessive piston-to-cylinder bore clearance
|
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1. |
Perform cylinder leak down and compression
tests. |
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2. |
Inspect the piston, piston rings and cylinder
bore. |
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3. |
Repair or replace all damaged components. |
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Excessive crankshaft thrust bearing clearance
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Severely worn thrust surfaces on the crankshaft and/or thrust
bearing may permit for and aft movement of the crankshaft and
create a misfire code without an actual misfire condition.
|
1. |
Inspect the crankshaft end play and crankshaft
thrust bearings. |
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2. |
Repair or replace all damaged components. |
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