M102 W201 TIMING CHAINS

1982-1993 :180E, 190E, 190E 2.3, 190E 2.6, 190D 2.2, 190D 2.5, 190D 2.5 T
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John Vauden
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Model you own: w201
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M102 W201 TIMING CHAINS

Post by John Vauden » Mon 24 Sep, 2018 12:41 pm

Hi Again all!

Just a quick question regarding timing chains on 190E 2.0ltrs. Mines a 1989 model and has the twin sprocket timing chain and I'm told these last the life of the car. However, my car only has 129,000 km on the clock. I'm the second owner and at startup, I have a rattle coming from somewhere that recedes as the car warms.

I had a W123 230E that had a rattly water pump till the coolant ran through it. That eventually committed hari-kari on me when the bearing gave out. It was a messy but relatively easy fix.

Recently I replaced all engine, trans mounts and the front drive coupling which reduced the number of start-up rattles significantly, but this persists. So I'm thinking:

1. it's an exhaust rattle as checking the exhaust, it looks like something DR Frankenstein cobbled together after a few vodka shots with Igor! As the exhaust runs from right to left is there a particular flange or heat shield I can look for that a common problem?
2. the water pump as per my W123 230E
3. the timing chain as the tensioners are a bit on the soft side after 29 years of limited use.

Does anyone have any suggestions as to how I can diagnose this further? Do timing chain rattles happen when the car's warm or only on startup?
do these twin chains rattle at all or was that reserved for the single sprocket chain?

Any thoughts would be deeply appreciated?

Cheers
John

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pastelgrey300D
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Re: M102 W201 TIMING CHAINS

Post by pastelgrey300D » Tue 25 Sep, 2018 5:59 pm

Hi John,

Can't help with the timing chain question but here's a couple suggestions:

I'd pull the drive belts one at a time to see if you can narrow it down to the water pump/alternator/ps pump as being the culprit

I'm not sure if they were still doing this on the W201 but on my Finnie the generator is mounted to its bracket with rubber and metal bushings - these had disintegrated and I was getting metal to metal vibration between the generator mounting bracket and the generator itself. Just thinking out loud that perhaps there is something attached to the engine (alternator, a/c compressor, p/s pump) that might be a bit loose and causing the rattle?
David
1967 W111 230S - Horizonblau
1965 W110 190c - Mittelrot
1967 W110 200D - Weiss (work in progress)
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oldmercfan
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Re: M102 W201 TIMING CHAINS

Post by oldmercfan » Tue 25 Sep, 2018 9:17 pm

Hi John, I have a 1985 W201 with a similar issue. Unfortunately, I don't know what it is either, but might be able to rule out a couple of things. I think it's unlikely to be the timing chain. My tensioner is working ok (I had Barry Green - a terrific MB mechanic in Norwood - tell me so). He thought it might be the fanbelt tensioner. I subsequently replaced the belt tensioner with one from a 270k car (my car has 360k, so I thought it might be worth a shot). It did quiet things a little, but the rattle I get whenever the engine is at low revs is still there. (Maybe I should just buy a new one and then I would know for sure!) When I say low revs, I notice the noise pulling away from a stop for the first few seconds. It does not happen at idle. When the revs get up to anything like normal speed it completely disappears. It is worse when the engine is cold. It does sound to me like an exhaust vibration on the body, or maybe a worn mount somewhere, but its pretty hard to diagnose when the car is stationery and as I said, it doesn't make the noise at idle anyway. The idea of taking off belts individually is crafty, but if your M102 is the same as mine, it will have only one big serpentine belt. If I stumble on the answer, I will be sure to let you know.
1972 W114 280E (Tiefblau)
1986 W201 190E (White)

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John Green
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Re: M102 W201 TIMING CHAINS

Post by John Green » Wed 26 Sep, 2018 10:04 pm

My money would be on the drive belt tensioner damper. The nylon bushes in them flog out and they rattle on start up. You can also sometimes pick it as they will rattle a little when the a/c compressor kicks in.
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oldmercfan
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Re: M102 W201 TIMING CHAINS

Post by oldmercfan » Wed 26 Sep, 2018 11:05 pm

Thanks, John. Definitely time to get myself a new one. I spent 19 bucks at the wreckers and should have just bought a new one. At least I learned how to replace them!
1972 W114 280E (Tiefblau)
1986 W201 190E (White)

John Vauden
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Joined: Sun 05 Aug, 2018 6:17 pm
Model you own: w201
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Location: Coogee

Re: M102 W201 TIMING CHAINS

Post by John Vauden » Wed 26 Sep, 2018 11:26 pm

Thanks for all your input, and John Thanks for letting me know about the drive belt tensioner I never thought of that one !! I'll take a look at that over the weekend!

Cheers

John

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John Green
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Re: M102 W201 TIMING CHAINS

Post by John Green » Fri 28 Sep, 2018 12:56 pm

oldmercfan wrote:
Wed 26 Sep, 2018 11:05 pm
Thanks, John. Definitely time to get myself a new one. I spent 19 bucks at the wreckers and should have just bought a new one. At least I learned how to replace them!
When we were dismantling a lot of cars, there was a list of parts that we refused to spend our time taking them off for resale. These belt dampers are one of them. Slightly differant if it is your own time that you are potentially wasting.
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