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Thread: Pistons need changing if Valves have hit!?!?!

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    Regular Member Coupe2T's Avatar
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    Default Pistons need changing if Valves have hit!?!?!

    Quick question, if valves have hit pistons, an the valves need changing, should the pistons be changed too!?! Or is there circumstances where the pistons would still be fine!?!

    Only asking as just had a repair on my Vectra and I've been told that valves have had to be changed as well as rockers as they broke but no pistons, seemed a little odd to me!?!

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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9CDTi

    Year : 2005

    Mileage : Lots

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    Pistons won't always be damaged. It is possible to get away with it. Unless the valve breaks off and embeds itself in the piston or any serious damage happens to the top surface you'll be fine.

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    Regular Member rich r's Avatar
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    The valves are a relatively soft metal, quite thin too, compared to the big lump that is the piston. I've rebuilt countless engines over the years, and the worst damage I've seen a valve do to a piston is a bit of a scratch that doesn't affect running. Also the piston is being pushed by a big chunky conrod by the heavy crankshaft, whereas the valves are fed from the weedy camshaft (and rockers depending on engine), so they're always going to come off worst.

    What can do more damage though is if the valve head breaks up, and the bits of metal scratch the bores.

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