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1998 S600
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Discussion Starter · #1 ·
Guys,

I was reading around and some people are recommending replacing the timing chain in the W140's as periodic maintenance.

It doesn't make sense. Everything I've read about timing chains is that manufacturers use a timing chain instead of a timing belt so that you don't have to replace it.

Any thoughts?


-Vic
 

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it will need replacing at anything from 100,000 miles to 200,000 miles.. depends on engine / wear and tear / how you drive etc etc. it will start to make a loud ticking noise when it needs doing. then budget 1000 usd or so for replacement. (thats a guess)
 

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1998 S600
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Discussion Starter · #3 ·
$1000 USD ?!

You can buy the chain for $119 USD at:

http://www.germanstar.net/119e.htm

Come on guys...I really get frustrated with misinformation!

-Vic
 

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SEC 600 V12 2dr COUPE (RHD) One of the chosen few.
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vtyagi - 1/28/2005 6:12 PM

$1000 USD ?!

You can buy the chain for $119 USD at:

http://www.germanstar.net/119e.htm

Come on guys...I really get frustrated with misinformation!

-Vic
So you get your $119 chain and feed it gently in through th oil filler cap.. make sure you can get the end of the other one out when you do..
You muppet..
of course if you are going to do it yourself.. please take pics..and post them here .. will be interesting to see how you get on..
 

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1997 S600 (sold)
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haha. The engine gnomes get to work after you place your $119 timing chain

under your pillow at night.

Seriously, vtyagi, several hours of labor are involved (making the assumption that you are having the job done by a mechanic).

Brett
 

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1997 S600 (sold)
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Nothing lasts forever. But, lifetime of ownership for a car for many

people is 5-6 years and around 100,000 miles, hence the timing chain lasts for the "lifetime" of the car.

The timing chain can break with the result being significant engine damage likely necessitating a complete engine rebuild (at least if the MB engines in question are interference designs). Interference design refers to an engine in which the valves and pistons will make contact if the valve timing is lost.

Most people would rather pay $1000 to change the timing chain as preventative maintenance rather than take the risk of having to pay many thousands more for a complete rebuild in the event of the timing chain breaking.

Rather than the timing chain, one should probably worry more about the timing chain guides and tensioners. The guides are usually made of a plastic and may be more susceptible to degradation and failure. Failure of the guides can lead to chain slack causing the chain to "jump time" (skip a tooth on the sprocket) leading to the above-mentioned valve/piston contact. If one is going to go through the trouble of tearing down the front of the engine to replace the chain guides, you may as well replace the chain, too. After all, it's only a $119 part. The incremental cost is not significant.

Brett
 

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S600, 350SL, C300
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Chains wear. A 130 link chain has 130 wear points. If each wears by .002", the chain stretches by over a quarter inch! As a chain stretches, the valve timing changes and performance/economy decrease. If it stretches too much, the tensioner can't compensate, the chain jumps a tooth or two and the valves meet the piston heads. You now have a $4000 plus repair bill - rebuild heads, replace pistons, new crank, etc.

The chain stretch can be measured by comparing the index mark on the valve cams with the timing mark on the crank. When it gets out of limit - REPLACE the chain, guides, and tensioner. Or just replace every 100,000 miles as a PM step. Guides seldom wear out, but the plastic gets brittle and is prone to break after twelve or so years.

Have replaced several timing chains in various MB engines and consider it cheap insurance if you intend to run the car a long time. Had only one engine that the chain jumped a tooth. The previous owner had the "chain replaced" at a dealer 25K miles before and the recepts to prove it, so i did not measure the chain stretch or inspect the guide rails. Dropped stone dead on I-495 and cost me over $1100 in parts and a lot of my time. Could have done several chain jobs for the time and money.

Replace the timing chain, guide rails, and tensioners in gassers at 100-125K or pay the price. That's why.
 

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Depends on the day!
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The M119's need their chains replaced b/w 100 and 200K. When exactly is dependant on a number of factors, from what I have experienced, oil change interval plays the most crucial role. The cars that were changed as per MB spec @ every 7500 miles or so need their chains changed sooner rather then later. If the car has been tended to by an enthusiast and had it's oil changed every 3K you can usually hold off a while longer.

Either way, changing a chain is some of the least expensive insurance out there to ensure your car will continue to work properly for long time. By the time you have the chain, rails, tensioner you'll be in for around 300+ in parts and 6-700 is not out of the question for an indy to install it (thus no mis-information on this board, just sound estimates).


Jonathan
 

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1994 W124 E320 1997W140 S320(RIP),1993W140300SE(RIP),2000W208CLK320(RIP) , 1993 W201 190E 2.6 (RIP),
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RE: haha. The engine gnomes get to work after you place your $119 timing chain

Brett San Diego - 1/29/2005 1:19 AM

under your pillow at night.

Seriously, vtyagi, several hours of labor are involved (making the assumption that you are having the job done by a mechanic).

Brett
Ha, I notice Vtyagi's been a no show in his own post since these guys finished "mis-informing" him.[:I]
 

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1998 S600
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Discussion Starter · #10 ·
I just got back from a trip to the US Virgin Islands....it was awesome.

Anyways, thanks for detailed info on the timing chain question!

-Vic
 
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