CL HELL: rattle and vibration

[Rafy126]

Hi guys,

Been a while since i posted on here with my old SEC, now i've managed to get my hands on a W215 CL 500 (2000) with about 105k miles.

A month or two ago it started making a rattling noise and what i can only describe as a worn bearing/vibrating/moaning noise coming from the engine.
The noise gets faster the more revs i give, even in neutral/park!

Eventually my power steering emptyed itself as the pump (ABC) broke!
So i had it replaced along with the following components advised from the mechanic (independent but ex merc!).

ABC pump: 0024666001
Vibration pulley: 1120351400
Tensioner: 1122000970
Shocker: 1122000014
3 x sensors: 2115401717

BUT the noises are still there!!!!! The parts have been fitted as they are all shiney new ones!

I thought it might be gearbox but the oil level is spot on.

Any ideas of what it could be, it also hunts for revs a tiny amount when letting off the gas since it's been to the garage???

 

[Alex Crow]

the whine could well be the abc system. there is an accumulator in the hydraulic circuit used as a vibration damper, these are to prone to collapse and cause a whining which increases with engine rpm. if you sit inside holding the revs at 1,500 rpm it should be a clear noise, now operate the raise/lower switch a few times at 5 second intervals - if this significantly alters the noise i would change the accumulator. hth

 

[television]

We have never had a complaint about this before.

109 and 140 are reservoirs but not for vibration

 

[Alex Crow]

the damper in question is mounted under the o/s of the car, about in line with the bell housing. we have seen this twice before, the first one we saw was diagnosed as having a noisy pump, but a new one made no difference! changing this accumulator/damper cured both. beware the parts department though - they have the wrong one listed as being the damper, wis has it listed correctly.

part number 410 is the damper http://www.detali.ru/cat/oem_mb2.as...GA=722.633&CT=F&cat=65N&SID=32&SGR=235&SGN=03

note part number 150 is described as going to the damper http://www.detali.ru/cat/oem_mb2.as...GA=722.633&CT=F&cat=65N&SID=32&SGR=290&SGN=04

 

[Rafy126]

ok, that sounds exactly like what it may be.

I shall test it when i get the chance, but in the mean time is it safe to drive?

If this damper fails will it still run ok with a noise or will it start effecting bigger things?

I'll keep you updated, thanks.

 

[Rafy126]

i've just done the test sitting inside the car holding it at a constant 1500 rpm, with the raising & lowering at 5 second intervals, the noise was constant all the time, apart from at the end of the raising sequence there was a little rattle!?!

I also noticed after the car started and warmed up and the idle calmed down, the rattle got a little louder and heard a fast ticking noise coming from back of engine passenger side. (spark shorting out? Injectors?)

 

[Rafy126]

Hey punks!

Had a merc mechanic all over my car about this bloomin rattle noise, he said he used a smaller merc belt which misses out a pulley of your choice to see if any pulleys are causing the problem, turns out to be A/C pump is causing rattle, he said over £1000 for the pump alone!

I told him to C#@%&$% and he said he could just fit a smaller belt to avoid turning the A/C pump all together! About £40, and is a common thing!

I never use A/C as it's allways to cold for me anyway!

Cheers