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  #1  
Old 05-22-2009, 03:29 AM
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'Normal' timing chain stretch

Hi all,

This is a question that's really been bugging me ever since I carried out my first valve adjustment. I wanted to check my chain stretch using the cam spocket/tower mark to crank balancer method. When lined up I saw the marker at the crank between 3-4. The car only has 129K so I don't think that's correct or can it be possible?

Thanks!
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  #2  
Old 05-22-2009, 08:43 AM
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The chains stretch anywhere from 2 - 3 degrees after approximately 20,000 km.
Being that we don't know what car your talking about or giving the fact that you didn't measure the stretch the proper way I would say it's normal.

Danny

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  #3  
Old 05-22-2009, 04:35 PM
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Going out on a limb here, but I think he has a 78 240D.
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  #4  
Old 05-22-2009, 04:58 PM
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Quote:
Originally Posted by 78240D View Post
Hi all,

This is a question that's really been bugging me ever since I carried out my first valve adjustment. I wanted to check my chain stretch using the cam spocket/tower mark to crank balancer method. When lined up I saw the marker at the crank between 3-4. The car only has 129K so I don't think that's correct or can it be possible?

Thanks!
Did you check the Timing Chain Stretch by using the 2mm Method and an Dial Indicator?
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Old 05-22-2009, 06:37 PM
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Originally Posted by Skippy View Post
Going out on a limb here, but I think he has a 78 240D.
You used to be a Code Breaker in the military... right ?
LOL
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  #6  
Old 05-22-2009, 06:42 PM
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Quote:
Originally Posted by Diesel911 View Post
Did you check the Timing Chain Stretch by using the 2mm Method and an Dial Indicator?
He does not want to check it correctly according to the procedure in the MB Factory Shop manual... he wants to use the tower mark and then wonder if the reading is correct... He wants to ignore the part of the FSM which states that the tower mark is only for guidance in assembling the engine in the first place.
So get off his case with the technically demanding questions... LOL
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Old 05-22-2009, 06:49 PM
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Thanks gentlemen!
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  #8  
Old 05-22-2009, 09:15 PM
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Anytime !!!
There are huge threads in the archives which will fully cover this procedure....
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  #9  
Old 05-22-2009, 09:38 PM
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Originally Posted by leathermang View Post
He does not want to check it correctly according to the procedure in the MB Factory Shop manual... he wants to use the tower mark and then wonder if the reading is correct... He wants to ignore the part of the FSM which states that the tower mark is only for guidance in assembling the engine in the first place.
So get off his case with the technically demanding questions... LOL

"I was drunk and I missed it" (from the old song).
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  #10  
Old 05-23-2009, 12:37 AM
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I thought lining up the mark was good for a rough estimate for stretch though? I guess there isn't much excuse when a dial indicator is only about 15 bucks from harbor freight, but still... Nothing exact, but a good ballpark?
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  #11  
Old 05-23-2009, 01:49 AM
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Originally Posted by tbomachines View Post
I thought lining up the mark was good for a rough estimate for stretch though? I guess there isn't much excuse when a dial indicator is only about 15 bucks from harbor freight, but still... Nothing exact, but a good ballpark?

I believe it was Brian Carlton who was keeping track of the readings different member got when they did it both ways. If he reads this maybe he will chime in.
Lining up the mark is exceptionaly close but only if you do it with care nd get your face down their near the marks to make sure if they are lined up.
If you are observing at any sort of an angle and from a foot or 2 away you decrease your chances of lining it up accurately.
Not a bad idea to do it 1-2 time more after the 1st reading to see if you get the same degrees each time.
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  #12  
Old 05-23-2009, 09:50 AM
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The FSM specifically forbids using that method...

Brian was not using hundreds of cars in his comparison..
so you really can not extrapolate that to all other cars...

I do not know what variables might change that relationship ..
thus I always point out that the FSM... printed by MB specifically says DO NOT use that for checking the chain elongation.

It is your car though... so whatever one does with their car is pretty much their business as far as I am concerned...
but I do have a problem with using the information ... when in conflict with the FSM ... to promote others ( read newbies ) doing the same with their cars... just not fair to the newbies...
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