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Topic Review (Newest First)
12-12-2012 01:55 PM
birkey Put a ruler parallel with the chain and use a machinists rule perpendicular to determine the slack. I believe 1/4 inch is MAX.
12-12-2012 01:38 PM
Originally Posted by 39chevy View Post
How much slack in a tc before it should be changed? Tia, Dana
Like most have stated if it's apart; replace it. If it is something that your on the fence about, a rebuild perhaps and need a good reason; replace it. I've never given thought about the service limit on a fixed timing chain. I say that because I'd replace it but something like a 64 Mercedes 220b, 6cyl or a Suzuki, GLS800, you never know, are adjustable. In that case you would look at how much adjustment is left bla bla bla because it's now a $250.00 chain W/O gears.
What's the engine? Just curious, I'm guessing a good-ol Chevy.

12-12-2012 07:52 AM
vinniekq2 I had one engine that the chain was so stretched that it was hitting the cover.It did not run well. There is a very good reason why replacement chains are double and gears sets are metal. So many reasons to change timing chain sets.
12-12-2012 06:10 AM
My 2 cents worth

If the engine is apart I change them with new gears and a double roller chain. If it is a SBC with the nylon teeth change it. To check with out pulling the engine apart I pull the Dist cap and watch how much the rotor moves when turning the crankshaft back and forth with a socket and breaker bar on the big pulley nut, . My guess is if it has more than 5 * i change it.
12-12-2012 05:43 AM
timing chain ?

How much slack in a tc before it should be changed? Tia, Dana

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