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  #1  
Old 06-15-2010, 12:43 AM
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Help reading my timing chain stretch (pic included)

The photo below is from a 77 240d. Could someone with more experience than me help decipher how many degrees I am seeing there? thanks.

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Old 06-15-2010, 12:45 AM
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Looks to be about 5 degrees. Thats not to bad. You could install a key to almost correct the timing.
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Old 06-15-2010, 09:33 PM
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Thanks for the feedback.

I've looked through the site but have not found great instructions on how to change the woodruff key. There is a short tutorial on the wiki but I am having trouble deciphering anything from the pictures.

Any chance someone knows of a good tutorial on how to change out the key?
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Old 06-15-2010, 11:01 PM
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be mindful that it may already have the key change!! If it has then you need to just accept it and in years to come you may need a new chain & standard key.
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Old 06-16-2010, 12:26 AM
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Quote:
Originally Posted by 240dddd View Post
The photo below is from a 77 240d. Could someone with more experience than me help decipher how many degrees I am seeing there? thanks.

What is more important is we need to see a picture of how well the Camshaft Marks are lined up; if that is the method you used.
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Old 06-16-2010, 01:01 AM
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Quote:
Originally Posted by 240dddd View Post
The photo below is from a 77 240d. Could someone with more experience than me help decipher how many degrees I am seeing there? thanks.

I agree with all the above posts.

Keep in mind that this method is only a ballpark figure and that you should try it a few times to get a better sense of the measurement.

Pay attention to what diesel911 already said.

Or use the 2mm valve lift method (assuming from your previous posts, this is not something you will be interested in)
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Old 06-16-2010, 01:41 AM
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I aligned the camshaft timing marks very well I think. I rotated it 5 times and measured 5 times and it was near the 5deg mark each time.

I'll have to get a dial indicator and try the other method.
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Old 06-16-2010, 01:46 AM
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what you did is 'close enough' to determine if you need a new chain.

keeping in mind the offset key theory.

maybe if you ever time the injection pump... bump it a few degrees early. Not a requirement though.
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Old 06-30-2010, 06:23 PM
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So I'm pretty sure that a new chain is the best answer, however I do not have the money for this at the moment (I'm currently working on the front suspension, ball joints etc...).

As a temporary fix/improvement I would like to install a woodruff key to bring the timing closer to spec.

Assuming a woodruff key has never been previously installed (I know the PO and i'm 99% it hasn't), are the woodruff keys sold here at peachparts a 1:1 match for the reading I have taken early in this thread?

i.e. if I am showing 5 degrees off is the correct key the 5 degree woodruff key?
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  #10  
Old 06-30-2010, 09:12 PM
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IIRC the key was for only 4 degree
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  #11  
Old 07-01-2010, 01:57 AM
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I think the top item for sale here is a 5 degree woodruff key: part # W0133-1633924
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  #12  
Old 07-01-2010, 05:58 AM
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Originally Posted by 240dddd View Post
The photo below is from a 77 240d. Could someone with more experience than me help decipher how many degrees I am seeing there? thanks.

The pointer is pointing to the letters "PMS". That be German for Top dead center?
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Old 07-01-2010, 08:42 AM
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I know the OP is not listening....

but just for the record..... for others in the future thinking of using this thread as a guide...

The MB FSM specifically rejects the use of the cam towers for measurements..
only the 2mm movement of the number one intake valve is given for this measuring process. And there is a number of degrees which must be factored in also.. it is not a ' read direct from the pulley ' correlation to the number of degrees it is off.....

There are threads in the archives which tell how to do this properly.
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  #14  
Old 07-01-2010, 10:36 AM
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Greg, you really have to start telling the "why" part of the story instead of just quoting the manual.

The mark at the cam is not a "precision" mark. It was only intended for assembly so one doesn't get the chain off by a tooth. It is not any more accurate than that, so you can't count on it for measuring chain elongation.
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  #15  
Old 07-01-2010, 12:39 PM
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Rick, you will find me saying that on other current threads.... I am just getting lazy I guess..

Under the ' why did you not complete the thought ' ... why did you not add the link to that thread I always have to email you to ask for... which has that ' add or subtract X degrees factor' in this procedure ?
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