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  #1  
Old 11-22-2005, 11:05 PM
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Time to replace timing chain?

I have an '81 300sd with 275,000 miles on it. The car is immaculate, it appears that the previous owners took great care of it and it has very little blowby. I was thinking it might be a good idea to replace the timing chain as preventative maintenance. I was told if the car was treated right and always had proper oil changes that the timing chain should never die. Is tis true?

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  #2  
Old 11-22-2005, 11:19 PM
t walgamuth's Avatar
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well maybe

but the chain can be checked for stretch. if it is not stretched it can just keep going. you might also want to take a look at the chain guides. they often wear out before the chain.

tom w
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  #3  
Old 11-22-2005, 11:50 PM
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double chain

that engine has a double chain...
why replace a double chain....

two chains, two chains in one....

if you have to do something just replace the tensionior and the
chain guide...
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  #4  
Old 11-23-2005, 08:24 AM
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Quote:
Originally Posted by PatricdeBoer
I have an '81 300sd with 275,000 miles on it. The car is immaculate, it appears that the previous owners took great care of it and it has very little blowby. I was thinking it might be a good idea to replace the timing chain as preventative maintenance. I was told if the car was treated right and always had proper oil changes that the timing chain should never die. Is tis true?
never say never, but don't jump into changing it just because of mileage. Do check the condition of the guides and the overall valve timing deviation. Valve timing is checked at 2mm lift at the #1 intake. As previous poster stated, condition of guides and tensioner may determine this also.
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  #5  
Old 11-23-2005, 08:47 AM
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Go to this site:
http://skinnerbox.steaky.org/Service/W123/Index/617T/05Engine.htm

And click on:
05-215 - Inspection and adjustment of camshaft timing

Danny
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  #6  
Old 11-23-2005, 05:49 PM
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Check the stretch.

I just checked my 603 and I am just shy of 4 degrees at 254k. Since this is right at the limit of spec I'll roll a new one on.

MB specs 15 degrees with an upper limit of 19 for a 603.

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