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Old 01-18-2007, 09:18 PM
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Join Date: Jan 2006
Posts: 108
stipped threads on chain sprocket

Well all was going well on my job to replace a chipped chain guide rail on my 91 300CE / M104 engine...while I was there I decided to replace them all. I removed the tensioner since I was going to replace it to get the slack I needed but it was not enough to install the right hand side rail in place, rather than undo the chain, I opted to remove the 3inch diameter chain sprocket/idler that is attached to the front of the head on the right below the intake cam. I tried to loosen it but realized too late that this bolt is a lefthand thread and stripped the hole. As such, I cannot torque it to the 35NMs (27 ft pounds) it calls for. The sprocket rides over a sleve that is held in place by the bolt. I tried red thread locker but after letting it cure was able to break it free with a socket and little force. As such, is there any high strength metal to metal adhesive that would hold this in place. The hole is not entirely stripped since I am able to unscrew and srew the bolt into the front of the head...problem is once it mates with the sleve I cannot torque it down. I put a set of vice grips on it to see if I could pull the bolt straght out and could not. Since the chain rides on this, I want to make certain it does not come loose and really mess things up in there. PLease advise as the last thing I want to do is pull the head.


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Old 01-18-2007, 09:29 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 35,579
i would try to find a heli-coil for that size.

this sounds like a job for a professional machinist.

i don't think this is the place for any kind of glue product.

good luck

tom w

[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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