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Cambelt failed ???

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by shirbotmin, Sep 23, 2007.

  1. shirbotmin
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    shirbotmin New Member

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    [Sep 23, 2007]
    Just posting this for info.

    My 1999 A6 2.4 suddenly died one morning about 1 sec after starting. On trying to restart it sounded completely different as the engine was spinning without compression. Oh no - cambelt failure - I thought. I got my local independant garage to recover and they agreed with the diagnosis and stripped the front of the car down to get to the cambelt - which was intact.

    It turns out my oil pump pressure release valve had stuck closed, over-pressurising the engine and causing the hydraulic tappets to misbehave - resulting in the lack of compression.

    It still cost be £1000 to fix but at least I didn't have bent valves & dented pistons and I now have new cambelt kit and water pump fitted. Engine now running sweet as a nut again.
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