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#4508439 - 09/05/17 08:29 PM R4 compressor - squeal when engaged
JHZR2 Offline



Registered: 12/14/02
Posts: 41804
Loc: New Jersey
This is for my 1981 240D, running R-12. The compressor seized a few years ago, but it broke the belt, and didn't put junk in the system, fortunately. Put a new one on there, and it works great - holds charge, cools well, etc. I don't drive the car a ton though...

The other day I was driving it and was hearing some sort of a rubbing sound, but there was no squeal. That sound can be heard here, primarily in the second half of the video:



Today I was driving it, and noticed that when the compressor was engaged, I got a bit of a squealing noise. Not entirely sure if it was belt squeal, or more like a pump squeal, like cars with bum PS pumps sometimes make when starting cold. ALL belts are OE Contitech belts (either the ones with yellow printing or the ones with green printing and the MB star), and all look great.

If I disengage the compressor, there is no belt squeal or other noises.

Is this as simple as a sign of a bad belt? It is a number of years old, even if the car isn't driven much... Or is it a sign of a more significant issue forthcoming on the compressor or clutch?

Thanks!

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#4508446 - 09/05/17 08:34 PM Re: R4 compressor - squeal when engaged [Re: JHZR2]
Eddie Online   sleepy


Registered: 12/07/03
Posts: 9578
Loc: Florida, Cape Coral
I would inspect the belt for deterioration and proper tension. Ed
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#4508496 - 09/05/17 09:38 PM Re: R4 compressor - squeal when engaged [Re: JHZR2]
clinebarger Offline


Registered: 12/19/13
Posts: 1920
Loc: Fort Worth, Texas
Harrison R4?
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#4508497 - 09/05/17 09:38 PM Re: R4 compressor - squeal when engaged [Re: JHZR2]
14Accent Offline


Registered: 08/03/17
Posts: 395
Loc: MN
Check the clutch clearance? Could be some slippage there. Otherwise, try another belt. Unfortunately, my laptop speakers do your video no favors.

Side note: I just worked on a '77 240D the other day... How scary slow is that thing with working A/C?? I mean seriously, it takes an entire on ramp with the pedal on the pavement to merge at 55!
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#4508505 - 09/05/17 09:44 PM Re: R4 compressor - squeal when engaged [Re: 14Accent]
JHZR2 Offline



Registered: 12/14/02
Posts: 41804
Loc: New Jersey
Originally Posted By: 14Accent
Check the clutch clearance? Could be some slippage there. Otherwise, try another belt. Unfortunately, my laptop speakers do your video no favors.

Side note: I just worked on a '77 240D the other day... How scary slow is that thing with working A/C?? I mean seriously, it takes an entire on ramp with the pedal on the pavement to merge at 55!


They're not fast, but Ive taken plenty of highway trips in it.

Think about it, how fast is a tractor trailer? They merge onto the highways, right?

You may need to think about it a bit more, but imbeciles that "must" have a V6 to merge safely are at least as dangerous due to their mash the go pedal philosophy.

If I could have, Id have gotten an MT version. But with old pristine cars, its all about right place at the right time, and then attachment to the car...

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#4508511 - 09/05/17 09:46 PM Re: R4 compressor - squeal when engaged [Re: clinebarger]
JHZR2 Offline



Registered: 12/14/02
Posts: 41804
Loc: New Jersey
Originally Posted By: clinebarger
Harrison R4?


Correct. Was OE fit on these cars.Works fine with R-12, ok with 134a.

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#4508514 - 09/05/17 09:49 PM Re: R4 compressor - squeal when engaged [Re: JHZR2]
Nick1994 Online   content


Registered: 02/19/13
Posts: 10133
Loc: Phoenix, AZ
I think you need a new engine JHZR2, that car sounds like a diesel! grin2

How about belt tension? Pulleys lining up well?
_________________________
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#4508523 - 09/05/17 09:57 PM Re: R4 compressor - squeal when engaged [Re: JHZR2]
Chris142 Offline


Registered: 06/05/03
Posts: 16841
Loc: Deplorable in apple valley, ca
Are you familiar woth rollguy on the benz forums that sells a sanden compressor and brackets for those?
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#4508734 - 09/06/17 07:00 AM Re: R4 compressor - squeal when engaged [Re: Chris142]
JHZR2 Offline



Registered: 12/14/02
Posts: 41804
Loc: New Jersey
Originally Posted By: Chris142
Are you familiar woth rollguy on the benz forums that sells a sanden compressor and brackets for those?


Yes, believe they are for 617/5 cyl engines....

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#4508750 - 09/06/17 07:22 AM Re: R4 compressor - squeal when engaged [Re: JHZR2]
Chris142 Offline


Registered: 06/05/03
Posts: 16841
Loc: Deplorable in apple valley, ca
Originally Posted By: JHZR2
Originally Posted By: Chris142
Are you familiar woth rollguy on the benz forums that sells a sanden compressor and brackets for those?


Yes, believe they are for 617/5 cyl engines....
he is a friend of mine. He even went to my wedding where I stood on a dynamite box. I have helped him with hoses, welds,etc for his kits.
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

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#4510338 - 09/07/17 07:40 PM Re: R4 compressor - squeal when engaged [Re: JHZR2]
clinebarger Offline


Registered: 12/19/13
Posts: 1920
Loc: Fort Worth, Texas
Originally Posted By: JHZR2
Originally Posted By: clinebarger
Harrison R4?


Correct. Was OE fit on these cars.Works fine with R-12, ok with 134a.


The Harrison R4 is a terrible design, Mounting them them with flimsy steel brackets is almost a guaranteed noise maker. GM started using Aluminum Brackets for R4's in 1993 & three brace struts to quiet them down.

The belt squealing could be many things, Incorrect belt tension, Glazed Belt, Oil Slugging from to much refrigerant oil, Wrong size belt groove for the series belts your car takes, Some diesel engines use the wider "industrial" V-Belts.

With only 4 pistons, This compressor is harder to "start" than a 6 or 7 piston compressor, So you have that working against you!

As Chris142 alluded to......A Sanden SD-7 swap is ideal!
_________________________
2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

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