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Old 10-03-2022, 09:30 AM
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Join Date: May 2021
Posts: 6
Hi guys,

Sorry for digging up an ancient thread but I'm now in a situation where I guess many of us have been also.

My 1987 300D Turbo started making a "squeaking" noise this past saturday 01/10/2022, which made think it was something related to the belt.

Upon checking it happened to be the Fan Clutch making the noise. And it also makes a noise upon turning off the engine, like a harsh rotation stop, like it is scrubbing on something before stopping.

I'll order a new Fan Clutch today...

Upon reading some stuff on forum I saw the recommendation to also check the Vacuum Pump, just in case, to see if there is still an old, DANGEROUS one present... the infamous one that has no visible "screws" on it's surface...

As it happens, the car, which has 445.000km, does still have that INFAMOUS OLD Vaccum Pump hanging in there :O

I have an OM603.97X from a 1994 W140 S350 Turbodiesel which had around 230k kms and had no vacuum issues...

The pump has the reference 000 230 30 65 on it...

It does have the visible 4 "screws" BUT is it a safe one? Or do I need to disassemble it from the engine to confirm? I know only having those screws visible are no guarantee of it being a safe one from what I've read...

I'm just not able to disassemble the W140 one as I'm not close to it right now, and would like to know if it was possible to confirm the "safeness" of it without disassembly.

Thanks in advance.



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