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    Ask Smithy Xtra Melted piston

    Volkswagen Volkswagen Advice Volkswagen Golf Volkswagen Golf Advice Volkswagen Golf 2009
    ...
    When I took my 6500 km 2009 MK6 Golf 1.4-litre 118kw TSi back to the dealer with a heavy misfire they discovered number one cylinder had no compression. They showed me the problem, a melted piston, and they are now waiting for parts to come from Germany. In speaking to other dealers I now know of about 12 other cars with this problem. From what I understand, a hot running engine causes a melted piston, yet it?s only the pistons that are being replaced. Will this happen again?
    Answered by CarsGuide
    23 March 2010
    Graham Smith

    Pistons can melt for a number of reasons, but essentially it’s because the piston is getting too hot. It could be because of pre-ignition, a lack of cooling for the piston itself as it was for the Nissan Patrol turbo diesel when it was melting pistons, or it could be something else. That they are only changing the pistons isn’t necessarily an issue, it really depends on the pistons they use. If it were correct that they are having problems and are getting pistons from Germany I would hope that they have made a change to the piston design that would correct the problem. If they are simply replacing the pistons with ones that are the same as those that failed then you could reasonably expect to have them fail again. I would demand to know exactly what they are doing in the rebuild, so you know everything they do and you can make a proper assessment. It wouldn’t be a surprise to me if they installed a recalibration in the engine computer to alter the ignition settings.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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