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If the valves are hitting the pistons a. The engine would not be running, and b. You would have faults for camshaft adjustment/timing. The only way for a valve to find the pistons is if a cam was set out a few teeth. That would be immediately apparent.
Most likely a valve clearance is way off, or there’s some play in the main/rod bearings or wrist pins. Probably needs a full year down, seems unlikely they’ll offer to pay. Even though they should.
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