Noise upper part of the engine, regardless of engine speed (A20NFT/LHU)
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Noise upper part of the engine, regardless of engine speed (A20NFT/LHU)
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Cause
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Procedure
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Low oil pressure
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2.
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Repair or replace if necessary.
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Loose and/or worn brackets for rocker arms
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1.
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Check the rocker arm's bolt, nut or screw.
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2.
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Repair or replace if necessary.
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Worn rocker arms
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Replace the rocker arm.
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Incorrect lubrication of the rocker arms
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Check the following components and repair or replace if necessary:
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Oil filter bypass valve
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Oil pump and pump strainer
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Faulty valve spring
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Replace the valve spring.
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Worn or dirty tappets
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Replace the tappets.
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Worn out or faulty timing chain and/or damaged teeth on the sprocket
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Replace timing chain and sprocket.
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Worn, damaged or defective timing chain tensioners
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Replace the timing chain tensioners.
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Worn camshaft cams
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1.
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Check the camshaft cams.
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2.
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Replace the camshaft and tappets if necessary.
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Worn valve guides or valve stems
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Check the following components and repair if necessary:
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Valves that have jammed
Carbon deposits on the valve stem or valve seat may cause the valve to jam in open position.
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Check the following components and repair if necessary:
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