1998 w168 w/ 212000 km circa, never replaced the timing chaing .. what do you think?< - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 10-10-2018, 06:14 AM Thread Starter
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Question 1998 w168 w/ 212000 km circa, never replaced the timing chaing .. what do you think?<

Hello all, recently I brought my w168 to MB to have them mount new front dampers.
When getting the car back the dealer asked: "have you ever replaced the timing chain?" I said never.
He gave a terrified look and stated that with that amount of kms I should have done this twice already.
I know that the chain can stretch over time however the car doesn't seem to have any symptom related to a possible TC fault.
Actually sometimes in the morning the car will start, the revs will go down to almost zero like if it's going to power off and then they will go up. Some other times, also in the morning, if I start the car and move immediately the engine will do some rough stops, like it's going to stop so I have to accelerate with clutch down to bring revs up and then continue.
Also while accelerating in 1st or 2nd gear I can hear some rattling coming from the engine, this between 1000 and 2000 rpm. So what do you think? Can this be due to an old timing chain / tensioner or maybe just the tensioner?
MB charges 550 euros for the job, I didn't understand if this price includes the new chain etc.
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post #2 of 10 (permalink) Old 10-11-2018, 11:47 PM Thread Starter
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No idea anyone? I will get the chain and tensioner replaced at MB next week. I will ask to keep the old pieces so that I can check and document here what they looked like after 211000 kms.
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post #3 of 10 (permalink) Old 10-31-2018, 06:11 PM
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Originally Posted by Chris Nuvoli View Post
When getting the car back the dealer asked: "have you ever replaced the timing chain?" I said never.
He gave a terrified look ...

So what do you think?
I think MB service advisors are full of it.

Unlike those in some Renault engines, an MB timing chain doesn't require routine replacement lest it fail and destroy your engine.

This belongs in the "If it ain't broke, don't fix it" category, IMHO.
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post #4 of 10 (permalink) Old 11-01-2018, 03:41 AM Thread Starter
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I think MB service advisors are full of it.

Unlike those in some Renault engines, an MB timing chain doesn't require routine replacement lest it fail and destroy your engine.

This belongs in the "If it ain't broke, don't fix it" category, IMHO.
Probably though the chain stretches. Anyway I let them change the parts. Here are pics of the old ones.

https://imgur.com/a/WS7zycL
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post #5 of 10 (permalink) Old 11-01-2018, 03:55 AM
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Thanks for the pics. Looks like you can clean and oil that chain, to store away and re-use if your new one ever fails. Can't see anything wrong with it.
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post #6 of 10 (permalink) Old 11-01-2018, 04:06 AM Thread Starter
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Well it must be inspected. Actually I felt a change in the car after the replacing. Better and smoother acceleration
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post #7 of 10 (permalink) Old 04-04-2019, 03:42 PM
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...Better and smoother acceleration
Hi
Was there an oil/filter change. Anything else done to the car?

Cheers
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post #8 of 10 (permalink) Old 04-10-2019, 01:14 PM
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Timing chain doesn’t have a service interval.

What does need changing is the serpentine belt (poly-V belt) and tensioner pulleys. My main tensioner pulley disintegrated after 16 years/180k kms and took down the belt with it. Rubbish plastic.

I probably should have inspected it, but that part of the engine is inaccessible unless you jack the front and lie under it.
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post #9 of 10 (permalink) Old 04-10-2019, 02:02 PM Thread Starter
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Well the poly vbelt is a completely different story.
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post #10 of 10 (permalink) Old 04-11-2019, 11:04 PM
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I was questioning, because even tough the timing chain might be quieter, on point, etc.

The "better and smoother acceleration" is probably coming from something else.
Like maintenance/intervention done during the same operation.
Which to be quite honest seems more probable.

I never attributed any performance gain to the change alone. Was always something done alongside. Some examples being, oil and filters, new bearings, etc. ;-)
Changed a bunch of timing belts and timing chains (on motorbikes, never on cars). In fact when I get a car with chain it always set in the back of my mind the "don't touch" tag. LOL :-)

In the case of my W168 CDI (almost 300K) I believe it will go to the "grave" with the original chain in place. As any other chain driven vehicle I had or have. Includes Doblo, Trafic...
Cheers all
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