Nissan and Datsun Workshop Service and Repair Manuals

Engine Oil: Testing and Inspection
Oil Leakage

OIL LEAKAGE 

Check for oil leakage around the following areas.
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Oil pan

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Oil pan drain plug

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Oil pressure switch

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Oil filter

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Front cover

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Mating surface between cylinder block and cylinder head

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Mating surface between cylinder head and rocker cover

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Crankshaft oil seal.