Quote:
Originally Posted by ah-kay
I am not a heavy engine guy but this is what I know. BTDT the hard way.
1) It is very unusual not to have bent valves as it is an interference engine. You were driving slow so you may have dodged a bullet.
2) The scratch on the cylinder wall could indicate a broken compression or oil ring. I had the same scratch on an OM603 engine. You cannot tell unless you push the piston out.
3) Need to find out why the chain snapped. Chain fatigue or something in the way and snapped it.
Other may chime in. Hope this help.
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I was surprised as well that no valves were damaged. I removed every single valve and none were bent and the brass bushing were intact.
As with the scratch I don't know if it scored or just a surface imperfection. With a finger nail you cannot feel it. I did not examine it closely and it is dark out.
The chain snapped on what I believe to be my fault. I bought the engine not running and figured out the the timing skipped a tooth. I did not replace the chain at the time or measure for stretch. I think it was stretched from the previous repair and it was just its time to go. I ran about 40,000 miles from the last time I fixed the timing.