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  #1  
Old 10-05-2006, 11:24 PM
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Location: Cowlesville NY
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Chain stretch

Finally finished installing new chain and tensioner.
Prior to removing the old chain I measured 6 degrees after TDC.
After installation I get 2 degrees BEFORE TDC.
I'm guessing someone had already installed a key in the cam, gave me a total of 8 degrees stretch, chain was flopping in the breeze.

Anyway, if any of you feel safe with 4 or 5 degrees of stretch on a car you recently purchased, check for a woodruf (sp?) key. You may have a potential problem.
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  #2  
Old 10-06-2006, 12:08 AM
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greg,

Rubber stretches, timing chains elongate.

Elongation is caused by wear on the pins and bushings.

P E H
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  #3  
Old 10-06-2006, 12:20 AM
ForcedInduction
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You may not have a key installed. The keys work both ways. If you had it showing 4* before TDC, you could install the 2* woodruff key and get it back to 0 (Or, you could install with your current 2*BTDC and get it 2* after TDC).

I would not worry about 2*, the chain will eventually wear into it.
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  #4  
Old 10-06-2006, 07:17 AM
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Point I was trying to make -
Suppose you just bought a car, pop off the cam cover and measure your chain.
If it measures 4 degrees you would probably just put the cam cover back on and be on your way.

IF the car had already had a 4 degree woodruff key installed to correct previous stretch, you would actually have 8 degrees , a potential problem.
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  #5  
Old 10-06-2006, 11:37 AM
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The first thing we need know is what vehicle your talking about. Please go to the USER CP and put your location and vehicle info in your profile.

Second, if you look at the FSM new chains are built to wear in to 2deg.

Your right about the woodruf key being a potential problem. That has been mentioned a few times before but it's good for a reminder.

Danny
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  #6  
Old 10-06-2006, 12:08 PM
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It's a 240D
Man I bought it from was a diesel fanatic, told me I should check the chain NEXT YEAR.
Only put on about 4000 miles since purchase.
I did a considerable amount of reading here before attempting this task, saw where a new chain will 'break in' 2 degrees.
I saw nothing mentioned about 'caution' for a previously installed key.
It may be old news for you guys but a rookie on these things looks for any guidance he can get.
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  #7  
Old 10-06-2006, 12:49 PM
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How do you identify an offset key? Look at it in profile?

Sixto
93 300SD
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  #8  
Old 10-06-2006, 01:19 PM
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I would guess to remove the cam sprocket bolt and look at it. Possibly look from behind ????

Someone should have a proper answer.
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  #9  
Old 10-06-2006, 03:03 PM
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Quote:
Originally Posted by gregszustak View Post
Finally finished installing new chain and tensioner.
Did you rent a crimping tool to secure the chain link?
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  #10  
Old 10-06-2006, 03:49 PM
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Rented from Performance Products, only source I could find. ($32 + deposit)
Purchased 2 extra master links.
Chain didn't come with a 'temporary' link and I put on the master and ground it off after chain was pulled through.
Not sure all this was necessary, just overly cautious
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