Recent Topics
Does Rear Heater Need to be On?
by Gebo. 09/19/18 05:04 AM
125 years.
by Silk. 09/19/18 12:38 AM
How a VW DSG Transmission works
by StevieC. 09/18/18 10:42 PM
Full Synthetic vs HM Full Synthetic
by SierraMan. 09/18/18 10:06 PM
Champion AGM batteries
by bbhero. 09/18/18 08:53 PM
General opinion about Cooper CS5 Ultra?
by dan_erickson. 09/18/18 08:37 PM
Rotella Online Rebate
by PumpPusher. 09/18/18 08:13 PM
Audi A4 vs Volkswagen CC...or good old Passat?
by KCJeep. 09/18/18 07:19 PM
GM 454 engine
by dirtymudder. 09/18/18 07:13 PM
High Performance Motorcycle oil...which one?
by Neiz15. 09/18/18 06:50 PM
Need help High Performance Motorcycle oil?
by Neiz15. 09/18/18 06:38 PM
MC FL-500S CUT OPEN
by 53' Stude. 09/18/18 05:15 PM
FORD FACTORY FILTER CUT OPEN
by 53' Stude. 09/18/18 05:06 PM
2019 Harley Davidson FXDR 114
by DuckRyder. 09/18/18 04:59 PM
USS Forrestal question
by cjcride. 09/18/18 03:52 PM
Breaker Box
by Throt. 09/18/18 03:00 PM
Honda metal fuel tank seam leak
by wing0. 09/18/18 02:49 PM
Cracked single stage paint
by JHZR2. 09/18/18 01:45 PM
Options versus dealer oil changes
by Schmoe. 09/18/18 01:34 PM
Newest Members
vortex64, 19074, Redright9, Clif67, scotstr
66011 Registered Users
Who's Online Now
44 registered members (askani79705, alarmguy, 77GrandPrix, Bailes1992, bbhero, 7 invisible), 819 guests, and 36 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics290,618
Posts4,847,597
Members66,011
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
R4 compressor - squeal when engaged #4508439
09/05/17 08:29 PM
09/05/17 08:29 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,085
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 08:34 PM
09/05/17 08:34 PM
Joined: Dec 2003
Posts: 9,794
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,794
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 09:38 PM
09/05/17 09:38 PM
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
Harrison R4?


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto
Re: R4 compressor - squeal when engaged [Re: JHZR2] #4508497
09/05/17 09:38 PM
09/05/17 09:38 PM
Joined: Aug 2017
Posts: 558
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 558
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 09:44 PM
09/05/17 09:44 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,085
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 09:46 PM
09/05/17 09:46 PM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,085
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 09:49 PM
09/05/17 09:49 PM
Joined: Feb 2013
Posts: 10,682
Phoenix, AZ
Nick1994 Offline
Nick1994  Offline
Joined: Feb 2013
Posts: 10,682
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 84k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 230k 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 09:57 PM
09/05/17 09:57 PM
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,341
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 durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 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 07:00 AM
09/06/17 07:00 AM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,085
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 07:22 AM
09/06/17 07:22 AM
Joined: Jun 2003
Posts: 17,341
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,341
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
Re: R4 compressor - squeal when engaged [Re: JHZR2] #4510338
09/07/17 07:40 PM
09/07/17 07:40 PM
Joined: Dec 2013
Posts: 2,177
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,177
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

BOB IS THE OIL GUY® Powered by UBB.threads™