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im by no means an expert ..but just a thought..
the reason that big time damage occurs when a belt goes whilst the car is running is that the valves and pistons meet at considerable velocity, repeatedly and the valves are damn hot so bend very easy...
there is a good chance that when spinning a car over if they did meet and the car was cold there might not be majour damage...but id certainlywant to check the clearences!
you might have got away with it! if not you have bent valves so wont get compression on the offending cylinder..now being all logical what we want to do is test the cylinders but without spending oodles of money...so how about...
remove rocker covers and roatate cam shafts till you can see the valves should be closed on the cylinder..then leak down test the cylinder...bent valves will show in the test...big style! you could go this very cheaply (if a little bit 'bodgerly' by modifying a spark plug to be an adaptor, clamping a hose to it and presurizing the cylinder with a compressor to say 20 psi and just seeing if it holds presure (oh make sure the crank is locked first..) repeat for all cylinders...
then get a small powerfull tourch and if you can see thru the park plug hole you may be able to check out the piston surface...
seems to me these test will cost you vey little if anything and may tell you a lot..
indeed just seeing how the valve stems react when the cams are turned is interesting...if one of the stems is miles out of adjustment its almost certainly bent....
if you want to know how i learned this...it was 3 days of trying to start a motor bike (kick start) that someone else had done an engine job on...(i.e. replaced timing chain, gears etc etc after snappngthe chain..) to find out they hadnt replaced the bent exhaust valve...
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