Engine Noise on Start-Up, but Only Lasting a Few Seconds
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Engine Noise on Start-Up, but Only Lasting a Few Seconds
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Cause
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Correction
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Incorrect oil filter without anti-drainback feature
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Install the correct oil filter.
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Improper oil viscosity
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2.
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Install the correct viscosity oil.
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High valve lash adjuster leak down rate
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Replace the lash adjusters as required.
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Worn crankshaft thrust bearing
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1.
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Inspect the thrust bearing and crankshaft.
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2.
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Repair or replace as required.
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Damaged or faulty oil filter by-pass valve
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1.
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Inspect the oil filter by-pass valve for proper operation.
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2.
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Repair or replace as required.
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Malfunctioning camshaft position actuators - improper oil viscosity or contamination. The result is camshaft actuator locking pin does not lock
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1.
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Verify correct engine oil viscosity by changing the engine oil and filter. Reevaluate the concern.
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2.
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Isolate the noise to a specific camshaft position actuator.
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3.
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Replace the camshaft actuator, oil and filter.
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Excessive piston-to-cylinder bore clearance
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1.
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Inspect the piston and piston skirt, connecting rod, and cylinder bore.
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2.
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Repair or replace all damaged components.
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