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auto-tensioner leak?

since hauling my engine out it looks like the oil wasnt coming from the crank seal, but from the seal round the plunger on the auto tensioner. is this a common problem?

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    not heard of it b4 matey, im sure you cant repair those so you will have to buy a new one.

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    there must be some sort of o-ring behind it so it can move and still seal against the block. maybe this is where its leaking?

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    Its a sealed unit and doesnt use engine oil. Its got a spring to push out and some sort of oil damping system or something HERE

    £175 for a new unit.

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