ABC tandem pump noise
Thread Starter
Junior Member
Joined: Jun 2018
Posts: 27
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2008 S600
ABC tandem pump noise
Hi people I have a 08 S600 with 46k on it and I was wondering if the abc pumps are known for being noisy I replaced the alternator 2 idler pulleys and the sep belt I checked the tensioner and a/c clutch all are smooth I feel the engine should be quieter any feed back out there ? Thank You
Senior Member
Joined: Nov 2017
Posts: 389
Likes: 52
Mercedes Benz S600
Hi people I have a 08 S600 with 46k on it and I was wondering if the abc pumps are known for being noisy I replaced the alternator 2 idler pulleys and the sep belt I checked the tensioner and a/c clutch all are smooth I feel the engine should be quieter any feed back out there ? Thank You
Senior Member
Joined: Aug 2019
Posts: 340
Likes: 189
From: Europe
09 SL500, 03 E320 CDI Wagon
Hi people I have a 08 S600 with 46k on it and I was wondering if the abc pumps are known for being noisy I replaced the alternator 2 idler pulleys and the sep belt I checked the tensioner and a/c clutch all are smooth I feel the engine should be quieter any feed back out there ? Thank You
When the double pump ( ABC + Power steering ) fails they tend to alarm you initial with a whine when you start the car, cold. Later it will be more pronounced and you will get white even later red warnings.
Sometimes you can see the disc in front of the pump, wobble. That is not good and the first sign the pump is about to fail.
What you don't want, is the pump to fail, and release debris into the hydraulic circuit, since the filter is sitting in the return line. ABC is a very delicate, sensible system, need TLC on a regular basis.
Has the system ever had a flush ?
A test is to take off the belt, and let the engine run for 30 sec. That will tell you if the noise comes from the engine or the attached parts. 30s will not damage the engine.
Last edited by SLcharge; Aug 29, 2019 at 01:34 PM.
Thread Starter
Junior Member
Joined: Jun 2018
Posts: 27
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2008 S600
More on Davids600 noise
The noise can be heard in and out of the car it increases and decreases with rpm can hear it in car when the car down shifts while slowing down the engine is whisper quiet that’s why I’m thinking abc pump I purchased the car 18 moths ago and it has always been there only drove it 3000 miles since I got it from Cali it’s very special car to me it is I’m trying to keep it 100% it never seen bad weather and is mint !
Senior Member
Joined: Nov 2017
Posts: 389
Likes: 52
Mercedes Benz S600
The noise can be heard in and out of the car it increases and decreases with rpm can hear it in car when the car down shifts while slowing down the engine is whisper quiet that’s why I’m thinking abc pump I purchased the car 18 moths ago and it has always been there only drove it 3000 miles since I got it from Cali it’s very special car to me it is I’m trying to keep it 100% it never seen bad weather and is mint !
If I needed a new pump, I think I'd go this route. https://www.ebay.com/itm/Servo-Pump-...1/263259586468
Might take a while longer, but they really seem to know their stuff. And price is great
