timing chain keeps breaking - JeepForum.com
LinkBack Thread Tools
post #1 of 4 Old 08-12-2007, 07:05 AM Thread Starter
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


tugboat is offline  
Sponsored Links
post #2 of 4 Old 08-12-2007, 11:50 AM
Registered User
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.
cjjeeper258 is offline  
post #3 of 4 Old 08-13-2007, 05:33 AM Thread Starter
Registered User
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

tugboat is offline  
post #4 of 4 Old 08-18-2007, 09:27 PM
Web Wheeler
1998 TJ Wrangler 
Join Date: Feb 2007
Location: Nice
Posts: 1,653
how tight is the chain when its installed new?
Nonya is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
timing chain noise?? cherojeep Engines & Drivetrain 13 03-11-2014 08:02 AM
timing chain replacment on 4.7 jyachera Engines & Drivetrain 3 03-10-2011 02:46 PM
timing chain and sprocket? 77mudder Engines & Drivetrain 4 10-09-2002 08:57 PM
Timing chain replacement CJ8DV8 Engines & Drivetrain 2 07-30-2002 11:45 AM
Timing Chain Question holmes133 Engines & Drivetrain 0 02-22-2002 11:23 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome