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R4 compressor - squeal when engaged #4508439
09/05/17 07:29 PM
09/05/17 07:29 PM
Joined: Dec 2002
Posts: 42,301
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,301
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!

Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508446
09/05/17 07:34 PM
09/05/17 07:34 PM
Joined: Dec 2003
Posts: 9,929
Florida, Cape Coral
Eddie Online sleepy
Eddie  Online Sleepy
Joined: Dec 2003
Posts: 9,929
Florida, Cape Coral
I would inspect the belt for deterioration and proper tension. Ed


CX5 Touring 2.5L :-)
Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508496
09/05/17 08:38 PM
09/05/17 08:38 PM
Joined: Dec 2013
Posts: 2,454
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,454
Fort Worth, Texas
Harrison R4?


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508497
09/05/17 08:38 PM
09/05/17 08:38 PM
Joined: Aug 2017
Posts: 664
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 664
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!


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: R4 compressor - squeal when engaged [Re: 14Accent] #4508505
09/05/17 08:44 PM
09/05/17 08:44 PM
Joined: Dec 2002
Posts: 42,301
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,301
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...

Re: R4 compressor - squeal when engaged [Re: clinebarger] #4508511
09/05/17 08:46 PM
09/05/17 08:46 PM
Joined: Dec 2002
Posts: 42,301
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,301
New Jersey
Originally Posted By: clinebarger
Harrison R4?


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

Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508514
09/05/17 08:49 PM
09/05/17 08:49 PM
Joined: Feb 2013
Posts: 11,095
Phoenix, AZ
Nick1994 Online content
Nick1994  Online Content
Joined: Feb 2013
Posts: 11,095
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?


2015 Hyundai Sonata 2.4L 88k Motorcraft Synthetic Blend 5w30 & OEM
2000 Toyota Camry 2.2L 231k Valvoline 5w30 & Fram Ultra
1996 Jeep Cherokee 4.0L 147k Mobil 1 HM 10w40 & Fram Ultra
Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508523
09/05/17 08:57 PM
09/05/17 08:57 PM
Joined: Jun 2003
Posts: 17,834
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,834
Deplorable in apple valley, ca
Are you familiar woth rollguy on the benz forums that sells a sanden compressor and brackets for those?


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: R4 compressor - squeal when engaged [Re: Chris142] #4508734
09/06/17 06:00 AM
09/06/17 06:00 AM
Joined: Dec 2002
Posts: 42,301
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,301
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....

Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508750
09/06/17 06:22 AM
09/06/17 06:22 AM
Joined: Jun 2003
Posts: 17,834
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,834
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 carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: R4 compressor - squeal when engaged [Re: JHZR2] #4510338
09/07/17 06:40 PM
09/07/17 06:40 PM
Joined: Dec 2013
Posts: 2,454
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,454
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/U341E
2000 Toyota Avalon 1MZ-FE/A541E

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