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Unread 08-12-2007, 06:05 AM   #1
tugboat
Registered User
1982 CJ7 
 
Join Date: Jul 2005
Posts: 53
timing chain keeps breaking

we rebuilt a 1981 258 ci engine and put in a comp cams cam kit [ cam,timing chain set,lifters]. After 2400 miles the timing broke and the teeth broke off on the lower gear. we sent it back to comp cam and the sent a new cam, lifters and timing set.we insalled it and broke in the cam.Then after starting it a second time and reving it up a little the chain and gear broke again.I don't know what breaks first the gear or the chain but it puts a hole in the side of the timing cover each time. Anybody have any ideas why this would be happening? comp cams has no idea

Steve

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Unread 08-12-2007, 10:50 AM   #2
cjjeeper258
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Join Date: Sep 2005
Posts: 191
That is a weird problem. A chain that is on a slight bind could over time fatigue and break. Perhaps there is an issue with the crank nose. Check for burs or apparent damage especially where the face of the gear contacts the crank.

Perhaps you have excessive run out on the crank and it is moving around and causing your problem.
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Unread 08-13-2007, 04:33 AM   #3
tugboat
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1982 CJ7 
 
Join Date: Jul 2005
Posts: 53
the engine was just rebuilt everything is new.Is anyone else using a timing set from comp cam? i'm thinking of trying a different brand

steve
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Unread 08-18-2007, 08:27 PM   #4
Nonya
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1998 TJ Wrangler 
 
Join Date: Feb 2007
Location: Nice
Posts: 1,653
how tight is the chain when its installed new?
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