Well now I'm not sure which pulley to use...

the Pulley on there turns about 1/2 turn when I spin it. (Fenner from the parts store)
The one I took off that is from 2014 Turns like a quarter turn when I spin it. (INA from Pelican parts.)
Both look pretty good.

I guess I'll try it with the one I just cleaned and put back on and if it chirps I'll swap them out.

INA is probably a more reputable brand. If it has a smooth feeling to it, I'd reuse it. It never squeaked with it installed right?

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

It squeaked with it installed, but the car had been sitting for a year and a few months at that point.

I'll put it on.

I cleaned it and scuffed it.

This is not on a Benz, but this worked for me on the AC belt of a Nissan Hardbody which are notoriously picky with V belts. All belts were new and tension was good. What you're going to read seems counter intuitive, but it if you're going to change the belt anyway, which is where I was, you've got nothing to lose.

I saw a video on the YouTubes where a guy said to spray the belt with 303.

https://www.youtube.com/watch?v=_8RE8p_m8bA

I couldn't find my bottle of 303, so I used Mother's VLR which is similar and smells the same with more cleaning ability. Squirted a good bit on all sides of the belt with the motor running and the AC off. When I turned on the AC it was improved considerably, but would squawk for about half second when the compressor kicked on. The following day, DEAD SILENT. This lasted for about a month until I noticed a little chirping at idle. Sprayed some more product on it and it quieted down again.

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#dontdealwithkahlil

OK. What's this fan clutch bearing?

I put it together and it didn't screech.

I put the fan on it started to screech.

I took the fan off and it still screeched.

My car does not have a fan clutch bearing bracket. There is no such part listed for a diesel.
There is for an E320.
Just not for a diesel.

The pulley behind the fan is connected to the water pump.

I tried the water test and it is the belt.
Stops for a few seconds with water.

Ugh.. New belt again.

I've got a new water pump coming.

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Jim

Fingers crossed that I don't need one.


Got the fan back on. Drove for half an hour and now we are back to a pleasant chirp. I'll live with the dang chirp.

When water spray makes it quiet, that isn't a water pump issue.

The pulleys might need cleaned again. Did the label get lightly sanded?

Chris, I read your Post#27 again and it's not normal for the water pump to make a scraping sound when you turn the pulley. How old is the water pump? It's possible the water pump is starting to fail and needs replacement. If so, best to buy a remanufactured one from your local MB dealer. Turn in the old one to avoid paying the core charge.

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Fred Hoelzle

Water pumps will have a slightly dragging, rubbery feel due to seal friction.