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  #16  
Old 12-18-2007, 12:55 PM
Hatterasguy's Avatar
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When I did mine a couple of years ago I didn't want to take a chance with such a vital part. So I went to the dealer got the chain, guides, and tensioner. Sure I probably paid an extra $100, but if the chain lets go it will cost me at leat $5k to replace the engine.

I also got the proper MB crimper from the tool rental program here.


Don't take chances with the timing chain, this is not the place to save money.


I'm more familer with 603's. On them with good oil changes you will see about 1 degree of stretch every 100k miles. 603's are more picky than 617's with timing, they really need to be dead on +/- 1 degree at most. 617's will be happy 3-4 degrees off, I bet 95% of the people on this forum wouldn't notice the difference. So on a 603 say around 250kish check it, see what you have and change if you need to.

Of course you never have to change it, if you are willing to accept slightly less then perfect preformance you can run the original chain to well over 400k miles; many people do.
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  #17  
Old 12-18-2007, 06:51 PM
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Quote:
Originally Posted by winmutt View Post
Why are you replacing the chain? The FSM doesn't specify that it should ever be changed. I have yet to hear of one factory isntalled chain that failed with oil in the engine. Whatever you do dont scrimp on the crimp!
o.o where have you been?
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  #18  
Old 12-18-2007, 07:35 PM
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I have a 99 E300 Turbo Diesel with 145,000 on it. How do I know if I should check the chain stretch. At what mileage does everyone recommend looking into this. I've been using synthetics ever since I've owned it (82K) and have no problems starting even in cold weather.
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  #19  
Old 12-18-2007, 09:21 PM
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Quote:
Originally Posted by Cervan View Post
o.o where have you been?
Ive been here, where have you been? Workin the corners again for me? Wheres my money?

As to all the timing chain discussion.... Have replaced plenty of motorcycle chains in my life, I know what a worn one looks like. I have yet to see a MB chain I would consider worn. Show me one story of factory chains snapping with a tank full of oil.
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  #20  
Old 12-18-2007, 10:47 PM
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After reading all of the responses I'm leaning toward, It never needs to be changed? Engine running strong (currently at 200,000) It's like my wife " The more I beat her, the better she likes it"
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  #21  
Old 12-18-2007, 11:04 PM
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I've repaired 2 engines that snapped the timing chain. I have replaced a number of chains that were stretched more than few degrees.
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  #22  
Old 12-18-2007, 11:57 PM
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Quote:
Originally Posted by E300TD99 View Post
I have a 99 E300 Turbo Diesel with 145,000 on it. How do I know if I should check the chain stretch. At what mileage does everyone recommend looking into this. I've been using synthetics ever since I've owned it (82K) and have no problems starting even in cold weather.
Run 100k more miles on it, and then ask that queston.
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  #23  
Old 12-18-2007, 11:59 PM
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Quote:
Originally Posted by winmutt View Post
Ive been here, where have you been? Workin the corners again for me? Wheres my money?

As to all the timing chain discussion.... Have replaced plenty of motorcycle chains in my life, I know what a worn one looks like. I have yet to see a MB chain I would consider worn. Show me one story of factory chains snapping with a tank full of oil.
Happens a lot actualy. 617's seem to snap their oil pump chains around 300k, and I have lost track of the number of 602's that have done it.
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  #24  
Old 12-19-2007, 12:27 AM
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Answer:

Quote:
Originally Posted by DIESEL126 View Post
Replacing my timing chain in my 85 300SD. Which one should I choose?

Iwis $121

Beck Arnley $53

Is the Iwis worth it a more than double the price?
This has all the answers you need, some with pictures.

Diesel Timing Chain Link Thread
http://www.peachparts.com/shopforum/diesel-discussion/162071-diesel-timing-chain-thread.html#post1251434








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  #25  
Old 12-19-2007, 01:17 AM
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Timing Chains DO NOT STRETCH!!!!

(the rollers and plates wear and increase the clearance between these items)

BUT THEY DON'T STRETCH

(its just easier to say "stretch")

We now bring you back to your regularly scheduled programming
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  #26  
Old 12-19-2007, 01:52 AM
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Ive always thought it was a good idea to replace the timing chain when the engine is approaching 300k. My 84 300d was about to get a new chain, then got totaled. But someday, that engine will get a new one before I begin using it again. My uncles td had 250k on it when he snapped his timing chain, he loves the wagon so much hes having the engine rebuilt right now. When he bought the car, it wasn't in that great of shape mechanically, which tells me maybe the engine maintained was neglected, leading to an early timing chain failure.



Ive also heard that when your chain is near snapping, you'll hear a tick, or some strange noise. I believe it though, my uncle had driven the car to our house from LA (400 miles) and it was having that tick before he left. Went home and a week later it snapped.
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  #27  
Old 12-19-2007, 02:03 AM
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I do think it's prudent to replace them someplace in the 200-250K range (about half the engine life before a full rebuild). Of course, it depends on the overall condition of the vehicle and how long you expect to drive it.

My 300D is on it's third timing chain and second oil pump chain at 416K miles. I replaced the timing chain around 200K (just because) then it was damaged by a vacuum pump incident and replaced again. The oil pump chain was replaced with the oil pump before 400K miles (the pump failed and the chain was in very tough shape, it would have broken soon).
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  #28  
Old 02-04-2011, 05:16 PM
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Frequency of oil changes will dictate the usable life of a timing chain as well. The chain wears much faster with infrequent oil changes.

If you leave it in service too long it will make a mess of the sprockets as well. Stretch must be checked periodically.

That is also the only way to tell usually if it has been changed before as most these cars come to us with little or no history. The other reason to check is the tweaked odometers on these cars. Most total indicated miles on the majority of them are not accurate. So it is really unwise to go by indicated milage.
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