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39chevy 12-12-2012 05:43 AM

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

timothale 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.

vinniekq2 12-12-2012 07:52 AM

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.

BigEsGarage 12-12-2012 01:38 PM


Originally Posted by 39chevy (Post 1621893)
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.


birkey 12-12-2012 01:55 PM

Put a ruler parallel with the chain and use a machinists rule perpendicular to determine the slack. I believe 1/4 inch is MAX.

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