Quote:
Originally Posted by maslin
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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It only happens under load and as mentioned they already said 3-4 of the valves were loose and out of adjustment. A valve can tap a piston and not ruin the motor if it is barely tapping. This could however bend the valve ever so slightly and even though they fixed the valve lash and tightened them up the fact they are slightly bent would maintain the noise, as they could be sticking or not properly sealing the cylinder during compression.