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Old 08-14-2007, 09:01 PM
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Timing Chain Stretch

I recently purchased a 1982 300TD. I took it to my local mercedes shop to have it checked out only to be told not to put any money into it. The garage feels the car isn't worth fixing. I drive the car daily without problems, most of the problems the garage found were steering and suspension related. I would like fix this car up myself. But I want to first check things like the timing chain stretch to make sure this thing doesn't die soon after I put money into it. Can anyone one here explain in layman's terms how to do this?

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Old 08-14-2007, 10:00 PM
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http://www.peachparts.com/Wikka/OM617TimingChainStretch
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Old 08-14-2007, 10:26 PM
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Quote:
Originally Posted by hrtmnstrfr View Post
I recently purchased a 1982 300TD. I took it to my local mercedes shop to have it checked out only to be told not to put any money into it. The garage feels the car isn't worth fixing. I drive the car daily without problems, most of the problems the garage found were steering and suspension related. I would like fix this car up myself. But I want to first check things like the timing chain stretch to make sure this thing doesn't die soon after I put money into it. Can anyone one here explain in layman's terms how to do this?
Just be aware that its measuring cam timing not "chain stretch". There is no mention in the fsm of replacement needed for any specific length and the there is adjustment up to 15' iirc. One of the top factors in these engines failing is a new timing chain.
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Old 08-14-2007, 10:32 PM
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Originally Posted by winmutt View Post
There is no mention in the fsm of replacement needed for any specific length and the there is adjustment up to 15' iirc.
There are only offset keys available to correct up to 10* (at the crankshaft) elongation.

If the chain is at 8* or more, it's time to replace the chain and guide rails.
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Old 08-14-2007, 10:45 PM
Craig
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Originally Posted by ForcedInduction View Post
There are only offset keys available to correct up to 10* (at the crankshaft) elongation.

If the chain is at 8* or more, it's time to replace the chain and guide rails.
Yup, and if it's still on the original chain at 360K+ miles it is likely to be due.

Incorrect installation of a new timing chain is a bad thing. BTW, it is not a bad idea to take a look at your oil pump drive chain too, mine was in very tough shape after almost 400K miles, take a look at this photo:

617 Oil Pump Chain
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Old 08-15-2007, 12:17 PM
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Quote:
Originally Posted by ForcedInduction View Post
There are only offset keys available to correct up to 10* (at the crankshaft) elongation.

If the chain is at 8* or more, it's time to replace the chain and guide rails.
How hard is it to replace the guide rails? Does that require me to pull the engine? I am just getting into DIY since this is my first MB Diesel. thanks in advance for any help.

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