A/C Question W123 - 1985 Mercedes 300D - PeachParts Mercedes-Benz Forum

marco5 · #1 04-24-2018, 09:05 AM

Hey guys,

I'm installing my A/C compressor and the kit comes with 3 orings. I was just wondering which one's I should use for input/output? Also why is there 3? Sorry for the noob question. This is a Spectra Premium A/C Compressor (reman R4) and a below screenshot is of the 3 orings and the compressor itself.

I saw the following for another brand for A/C compressor, however I'm not sure if it's for mine as well and I don't understand it. "GM Radial R-4 version Compressors having stepped ports require the the following seals be installed in the following manner : The large brass seal is only for the suction port. The green seal is to be used on the discharge port. The short(er) of the two sleeves is to be used in conjunction with the green seal. This centers the seal, which is essential to prevent leakage. The two other seals in the kit are not applicable for Mercedes. These seals will only be used in compressors having a stepped port configuration. See 24 342"

Thanks,

Marco

tangofox007 · #2 04-24-2018, 09:45 AM

When I bought an R4, it did not come with the correct seals. I sourced a TEM 407292 Yellow seal at the local NAPA store for the suction side and used a furnished green seal on the discharge side. I didn't use the insert sleeves, as it appeared probable that they would eventually wind up being ingested into the compressor.

marco5 · #3 04-24-2018, 10:04 AM

Thanks for the response, what exactly is an insert sleeve? From looking at the above pictures, I know it's just a guess but would you say these are the correct seals?

funola · #4 04-24-2018, 10:56 AM

Your best bet is take measurements of the thickness of the seals and the seats in the compressor and determine which are the correct seals. The seal has to "crush" some in order to work so it has to be thicker than the depth in the seats. Choose the 2 seals that would protrude an equal amount.

As for the insert, it is a thick metal bushing that goes in one of the seals and is held on by friction only. I have heard if it is not in there tight, it could dislodge itself, fall inside the compressor, destroying it.

marco5 · #5 04-24-2018, 02:27 PM

Thanks so much, I’ve noticed online that every kit comes with 3 seals.

My question is why 3 seals? It’s very confusing.

marco5 · #6 04-24-2018, 02:32 PM

https://m.ebay.com/itm/NEW-Mercedes-W123-300D-300TD-A-C-Manifold-Seal-Kit-Four-Seasons-900-130-06-15-/360884141525

There’s an example. Grr. Why 3 seals!! There’s only a input and output.

ROLLGUY · #7 04-24-2018, 03:24 PM

Quote:

Originally Posted by marco5

https://m.ebay.com/itm/NEW-Mercedes-W123-300D-300TD-A-C-Manifold-Seal-Kit-Four-Seasons-900-130-06-15-/360884141525

There’s an example. Grr. Why 3 seals!! There’s only a input and output.

The original compressors had Orings, and both ports were even (not stepped). The newer compressors have stepped ports, but the manifold on the 'Benz is flat (for original compressors with Orings). I believe that only new style compressors (stepped ports) are available new or as rebuilds. The GM R4 is a very popular compressor, and is used in many applications. When a new or rebuilt unit is sold, it is shipped (or should be) with every seal that is used, so it will work with any application.

marco5 · #8 04-24-2018, 04:47 PM

Quote:

Originally Posted by ROLLGUY

The original compressors had Orings, and both ports were even (not stepped). The newer compressors have stepped ports, but the manifold on the 'Benz is flat (for original compressors with Orings). I believe that only new style compressors (stepped ports) are available new or as rebuilds. The GM R4 is a very popular compressor, and is used in many applications. When a new or rebuilt unit is sold, it is shipped (or should be) with every seal that is used, so it will work with any application.

Thanks for the reply Rollguy. From the below documentation, what "Hose Block Side View" would you say that I have on the W123?

ROLLGUY · #9 04-24-2018, 05:56 PM

Quote:

Originally Posted by marco5

Thanks for the reply Rollguy. From the below documentation, what "Hose Block Side View" would you say that I have on the W123?

I would say #2 if it is talking about the manifold being the "hose block".

funola · #10 04-24-2018, 08:03 PM

The "heavy" R4 compressors with the big clutch coil use o-rings. You can still buy them as rebuilts. I bought one for my 85 300D. You can see pics of it here http://www.peachparts.com/shopforum/diesel-discussion/387054-4-seasons-remanufactured-r4-compressor.html

marco5 · #11 04-24-2018, 08:15 PM

To confirm, it's #2 in the diagram with the 3/4" fitting for both input and output?

ROLLGUY · #12 04-24-2018, 11:23 PM

Quote:

Originally Posted by marco5

To confirm, it's #2 in the diagram with the 3/4" fitting for both input and output?

It is the only diagram with a flat face, so it should be correct.

tangofox007 · #13 04-25-2018, 12:02 AM

Per the Tech Tip sheet, seals B (YELLOW) and E (GREEN) are what I used. (My compressor was furnished with two E's and one F.)

BillGrissom · #14 04-25-2018, 12:29 AM

Has been answered many times - yel & grn washers. I didn't read all above, just repeat info below I have posted before:

Suction port:
Four Seasons 24358, yellow
NAPA PN 407279
AutoACRepairs PN GA4508, $3
GM PN 2724888
1.32" OD (33.2 mm) x 0.12" th (3 mm), ~0.585 " ID
compressor hole recessed ~0.08"

HP outlet port:
Four Seasons 24357, green
NAPA PN 407278
AutoACRepairs PN GA4506, $3
GM PN 2724890
1.18" OD (29.9 mm) x 0.216" th (5.5 mm), 0.61" ID
compressor hole recessed ~0.16"

Included in some kits, but not used:
Four Seasons 24356, red
AutoACRepairs PN GA4507
GM PN 2724889
1.18" OD (29.9 mm) x 0.15" th (3.8 mm), 0.61" ID

3-seal kit (red, grn, & yell washers, w/ inserts, use only grn & yell):
Four Seasons 24342
AC Delco PN 15-20058
AutoACRepairs GA 4504-KT, $9
GM PN 2724887
O'Reilly's PN 24342 $15, in stock at 2421 Del Paso Blvd

Red & grn washers only:
CompressorWorks PN 620230

Oil:
Total system 8 oz
Makeup for:
drier 0.3 oz
evaporator 1.4 oz
condenser 0.7 oz
used compressor 2.4 oz
new compressor 6 oz

marco5 · #15 04-25-2018, 10:41 AM

Thanks, this will save YET another trip to my A/C Shop as they've been having trouble getting the compressor sealed properly. To confirm, all brands of the new R4 Compressor that have the stepped ports should only use the Yellow and Green washers and not the 2 black, 1 red given to be by the manufacturer?

eCatalog - Product

Napa has confirmed they have them. So no matter what was given to me, I'll use the noted/suggested yellow and green washers then.