Quote:
Originally Posted by ferg55
I believe this is what happened to your car? So it's not surprising the damage you have seen in your head - the forces inside an engine are huge and when valves collide with pistons.
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Yes, the alternator belt failed and part of it got stuck within the timing belt causing the engine to halt. Nothing made a part break then but clearly weakened the head till it cracked later down the line.
About the pistons and valves,
is it true that there can't be more damage? Mechanic's said he does head replacements way too often for Volvo's, just wondering as he said the head along with arms needs replacing, plus checking that camshaft is all straight and well.
If the arms got smashed out of place isn't that a hit against the valves from the pistions? Then again, the compression readings came back as perfect as they could be so I guess the valves have to be working even as the engine is running and runs no more than 600~rpm.