Expert: keith - 6/23/2005

Question
Hello,

I have a 1992 Chevy Corsica LT that I have owned for about 6 years.  While I was accelerating to get on the highway, I believe that the timing chain broke.

What I am trying to determine is whether the valves and pistons can come into contact when the timing chain breaks in the 3.1L V6 engine.  I got an initial quote of about $300 (seems reasonable) to change the chain but the mechanic cautions of the possibility of bent valves.  While I understand expressing caution from a generic responsibility standpoint, I would think the answer to the question of bent valves should be yes or no.  In other words, I would think the design of the engine (i.e valve reliefs in the piston top) would dictate if the valves and pistons can come into contact when a timing chain breaks, or not.  

Basically, I a trying to decide whether to risk $300 dollars or not.  The rest of the engine and trans seems to be in good working order (i.e no burning oil, or trans slip, 150K miles)

Any insight or experience would be greatly appreciated.

Thank you,
--marc


Answer
Hi Mark, it is possible that it has bent valves. I have replaced timing chains on dozens of theese engines, and have seen some with bent valves and I have seen some with no damage. There is no way to be sure without replacing the chain or pulling the heads. Its a risk whatever way you go. If you need more info just let me know. Good luck. Regards, Keith.