C140 W140 weird sound visco clutch pulley water pump related? (video inside) - Mercedes-Benz Forum
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post #1 of 30 (permalink) Old 07-21-2019, 01:54 AM Thread Starter
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Question C140 W140 weird sound visco clutch pulley water pump related? (video inside)

Hi there, I have a weird noise coming from my engine as of recent. When trying to locate the sound it seems like it is coming from the visco clutch or at least that general direction. The sound ist not coming from the engine innards it seems. The video was recorded on cold start with ac off. As far as regulating temperature goes the visco clutch seems to be fine. I have never had the cooling fluid go too hot, even at 100F+ (38C). Thermostat was renewed last winter with original parts. Car feels normal otherwise. I am basically hoping to find someone who recognises the error pattern and maybe has an idea on what it is and maybe even how to fix it.

Here is a video where the sound can be clearly heard, it seems to change when opening the throttle. Also it seem that it can almost entirely vanish when the engine is hot. For example yesterday it would just not be reproducable. I can rule out the waterpump since it is already electric and the sound persisted even with it unplugged.

Video with the sound I made:
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post #2 of 30 (permalink) Old 07-21-2019, 07:20 AM
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maybe you should take serpentine belt off and check every accessory (bearings) if it spins right and if there is any free play in it.

it is 10 minutes job including putting the belt under tension again.
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post #3 of 30 (permalink) Old 07-21-2019, 10:15 AM
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Not sure which sound you are talking about. I hear the smog pump.
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post #4 of 30 (permalink) Old 07-21-2019, 11:49 AM
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Facing Engine , Left headlight side , direction underneath the Water reservoir you see a black plug , pull it out . That is the Smog pump .
Test if the noise goes away pulling that plug .
If you cant find the plug were to disconnect follow the lead from the pump.

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post #5 of 30 (permalink) Old 07-22-2019, 01:21 AM
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+1 on smog pump given it goes away when warm, but you can use a long screwdriver, piece of metal etc to your ear on the various accessories to pinpoint it also
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post #6 of 30 (permalink) Old 07-22-2019, 01:32 AM Thread Starter
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Hi there, it is not the smog pump since it is electric. I have still tried unplugging it, sound persisted unchanged as expected. Next step will be taking off the fan belt and checking the pulleys.
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post #7 of 30 (permalink) Old 07-22-2019, 01:52 AM
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It actually sounded like a bad PS pump to me initially, does it change when turning the wheel? but making a racket and going away when warm is pretty typical of the air pump. Either way finding the source is easy one way or another.
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post #8 of 30 (permalink) Old 07-22-2019, 03:52 AM
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so my guess is visco clutch bracket (bearing).
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post #9 of 30 (permalink) Old 07-22-2019, 11:53 PM Thread Starter
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Quote:
Originally Posted by samosali View Post
so my guess is visco clutch bracket (bearing).
Will know more tomorrow, I hope it is not that cause that would get very expensive. Do you have experience with that failure? Cause what confuses me is that the temperature regulation still works perfectly. Drove in dense traffic yesterday at 34C/93F outside and the cooling fluid temperature remained totally stable at under 90C.
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post #10 of 30 (permalink) Old 07-23-2019, 12:20 AM
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it is not so expensive. this part costs ca 300 eur. I have an experience with this failure. this is the only car part in my entire life which I renewed on my own and I am sorry still now. After ca 5,000 km it broke in the middle of a 700 km long trip to the coast in the middle of nowhere. The cooler, fan, belt, fan shroud ... everything was in pieces.

I remember that sound (from your video) ...

It is visco clutch holder (bracket), so it is not related to visco clutch functioning.

It is easy to replace it.

Last edited by samosali; 07-23-2019 at 12:24 AM.
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