Chain job W203 Kompressor - Mercedes-Benz Forum

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post #1 of 22 (permalink) Old 09-19-2011, 04:57 AM Thread Starter
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Chain job W203 Kompressor

Just did a timing chain job on the W203 C200 Kompressor (red top) Everything seemed to have gone well, changed the main chain, tensioner and guides but now there is a timely on off rattle with slight throttle. The noise definately seems to be coming from the top pan/chain area. When I disconnect the cam sensor on the top pan the noise doesn't occur. Remember though it only on the initial slight throttle or accelartion not idling or mid driving. Comes on and then goes off in a very precise way.

Did I do something wrong or overlooked a component in the repair ??
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post #2 of 22 (permalink) Old 09-19-2011, 09:44 AM
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1. When you say "at initial throttle", do you mean that the sound is there through, let's say, 1200rpm and then disappears or do you mean that if you keep the engine at the lower rpm, the noise stays around?

2. How many kilometers on the car and what was the reason for timing chain replacement in the first place?

3. How did the cam gears look?

Felicita e un bicchiere di vino con un panino.
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post #3 of 22 (permalink) Old 09-19-2011, 06:15 PM Thread Starter
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Sorry I took so long to reply, a quick update though the car started this morning after being parked overnight and rattled off for a while then silenced.
What I mean by initial throttle is that the sound doesn't last, just an on and quick off buzz as the accel pedal is feathered or when u drive off a stop. Will then sit and idle without a sound. The car is 90, 803 Km and the chain rattled even during idle. Honestly I did not pay much attention to the cam gears. The one observation I did make is that when the cam sensor was disconnected the noise would not occur under the same conditions.
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post #4 of 22 (permalink) Old 09-19-2011, 06:35 PM
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Originally Posted by autoservslu View Post
Sorry I took so long to reply, a quick update though the car started this morning after being parked overnight and rattled off for a while then silenced.
What I mean by initial throttle is that the sound doesn't last, just an on and quick off buzz as the accel pedal is feathered or when u drive off a stop. Will then sit and idle without a sound. The car is 90, 803 Km and the chain rattled even during idle. Honestly I did not pay much attention to the cam gears. The one observation I did make is that when the cam sensor was disconnected the noise would not occur under the same conditions.
Well, a rattling chain means a loose chain. The question is why it's loose. Either it's the wrong chain, or the tensioner is not getting enough oil at idle, or, possibly, there is some damage to the cam gears causing the chain to slip somewhat at low RPMs. I'm working on explaining why sensor disconnect makes it go away.

90,000km is way too early for chain replacement. What sort of maintenance history do you have?

Felicita e un bicchiere di vino con un panino.
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post #5 of 22 (permalink) Old 09-19-2011, 07:07 PM Thread Starter
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Can we do this one on one ?? my email address is martinautoserv@yahoo.com
I have thrown away the packaging and may not be able to verify the part number. We have been doing regular maintenance on the car since 2008, regular oil change and always synthetic.
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post #6 of 22 (permalink) Old 09-19-2011, 09:16 PM
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Disconnecting the cam sensor affects timing, are you sure you got the timing spot on?

ERIC.

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post #7 of 22 (permalink) Old 09-20-2011, 03:25 AM Thread Starter
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From the info I had, yes, retainer pins in camshaft and crankshaft on 20 deg ATDC. Checked and rechecked although I got some other info online which said 0 deg TDC but

I went step by step on a WIS document and the last position before re-installing the chain was 20 deb ATDC

I hope I did not screw this up. Is there an easy way to recheck ??
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post #8 of 22 (permalink) Old 09-20-2011, 03:46 AM
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Originally Posted by autoservslu View Post
From the info I had, yes, retainer pins in camshaft and crankshaft on 20 deg ATDC. Checked and rechecked although I got some other info online which said 0 deg TDC but

I went step by step on a WIS document and the last position before re-installing the chain was 20 deb ATDC

I hope I did not screw this up. Is there an easy way to recheck ??
I will take a look at the valve timing in the morning at work. How bad did this rattle before you changed the chain?

ERIC.

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post #9 of 22 (permalink) Old 09-20-2011, 04:27 AM Thread Starter
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Put it that way, right now the engine is quite. The rattle sounds like its being turned on and then off for a second with a switch when you feather the throttle or drive off. In the first morning start it rattled off and then settled. Started after that with no rattle repeatedly.
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post #10 of 22 (permalink) Old 09-20-2011, 04:37 AM
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Originally Posted by autoservslu View Post
Put it that way, right now the engine is quite. The rattle sounds like its being turned on and then off for a second with a switch when you feather the throttle or drive off. In the first morning start it rattled off and then settled. Started after that with no rattle repeatedly.
Are you sure it is not something very simple like a heat shield touching the manifold, you may have accidently pushed the shield down whilst working on the car.

ERIC.

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