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  #1  
Old 09-03-2013, 12:27 AM
pwogaman's Avatar
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Possible OM603.96x/OM602 A/C Compressor Upgrade & Compatibility Discussion.

I've been doing some research on what possible upgrades I could make to my 87 300TD A/C Compressor, equipped with a Denso 10P15C that was standard to early M103 W124 engines and early M102 and M103 W201 engines. Subsequent 603.96 and 602 W124 engines came with the slightly larger diameter Denso 10PA15C and the M103 W124 engines got the Denso 10PA17C. The upgrade to the Denso 10PA15C on my 603.96 would require the newer support bracket and possible the newer 602 hoses used on the 92-93 124.128 300D 2.5 Turbos.

I was really interested in fitting my extra Denso 10PA17C (from a 1991 103 engine), but could not identify any support bracket that would work on any 60X block. So, the Denso 10PA17C with its even larger diameter will just have to be satisfied occupying shelf space in the garage for now.

It does appear, however, that the 603.97 engines in W140 came with the even more biggerer Denso 10PA20C! I suspect the belt alignment would work if the clutch and pulley were swapped out from one of the six rib models. Even still, the eight rib pulley might work even if not spaced the same since only six of the eight grooves would need to line up. The compressors on the 140.135 are 0002302211 or 0002300011 and the brackets are 6052300342, 6052300142, 6051310035, or 6051310135, and possibly also 6051300035.

I also briefly looked into whether a 606 compressor and support might work for more capacity, but the manifold on the compressor looked too great for simpler fitment. Also, the increase in compressor capacity was not as interesting as the Denso 10PA20C's once I got on that track.

Here are the various sizes. Note that these illustrations do not necessarily have the proper manifold, clutch, and pulley for Mercedes use, but the body sizes should be accurate.

10P15C


10PA15C


10P15C (dirty) next to a 10PA15C (clean)


10PA17C


10PA20C


Here are some various pictures of 602, 603.91x, 603.96x, 603.97x, 605, and 606 engines, with and without the compressor support bracket and compressor so you can get an idea of fitment.

601



602.91x


602.962


602.962


603.960


603.960


603.970


603.97x


603.971 with 10PA20C installed


605







606.912


606.962


Of course, as always, I reserve the right to be wrong, but I welcome any corrections.

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
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90 300TE 4Matic
90 300D 2.5 Turbo
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  #2  
Old 09-03-2013, 07:52 AM
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Wow, lots of sweet pictures of cool engines I can't afford! Now, what was this thread about, again?
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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

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  #3  
Old 09-03-2013, 10:37 AM
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2X on the pics!!!!
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Germantown, TN

Links:
Current Car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
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  #4  
Old 09-03-2013, 07:29 PM
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I cross referenced the timing chain cover, tandem power steering pumps' pulley, and belt tensioner and its pulley between on the 602.962 and 603.960 and the 603.971 engines and they all match up, so the surpentine belt pulley on the 10PA20C and the 10P15C should also line up.

The pullies on the two compressors have different part numbers, but I attribute that to the difference in diameter.

This might actually work!
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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
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  #5  
Old 09-03-2013, 07:39 PM
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If you need to take a peek at my 350SDL, which has the 10PA17C, let me know.

-J
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1991 350SDL. 230,000 miles (new motor @ 150,000).

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  #6  
Old 09-03-2013, 08:14 PM
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Cool. I had not yet appreciated that the W126.134/135 used a 10PA17C; I became too focused on the W140 and its use of the 10PA20C. Given I already have a spare 10PA17C from my 124.230 parts car, I would just need the 603.970 compressor support bracket (6031310035, 6031310235). There are probably not too may of those floating around pick and pull yards though.
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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
92 300TE 4Matic
01 Saab 9-5 Wagon
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  #7  
Old 09-03-2013, 08:22 PM
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The M104 isn't very different from the OM603 so that might be a source of a 10PA17C bracket.

Sixto
87 300D
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  #8  
Old 09-06-2013, 11:17 PM
pwogaman's Avatar
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Quote:
Originally Posted by sixto View Post
The M104 isn't very different from the OM603 so that might be a source of a 10PA17C bracket.

Sixto
87 300D
The M103 and M104 are too different. They incorporate support for the power steering pump among other things.

m103



m104

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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
92 300TE 4Matic
01 Saab 9-5 Wagon
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  #9  
Old 09-07-2013, 01:28 AM
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Ah, yes. Gassers don't have the IP annex and big filter mount to hold the PS pump.

Sixto
87 300D
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  #10  
Old 10-01-2014, 06:47 AM
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i know this is an old thread but do we have any more info on the 10PA17C and 10PA20C? from what i understand, the 10PA17C is on the 3.5l om603's that were in the w126 (350sd and sdl) and it will drop right in if you get the 3.5's bracket. is the rear manifold the same? and the 10PA20C is on the 3.5l om603's in the w140's. if you get that compressor and bracket, will it bolt up to the 3.0l om603? what about it's manifold?
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  #11  
Old 10-17-2014, 04:14 AM
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bump
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect
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  #12  
Old 09-11-2015, 11:39 PM
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I picked up a 603.971 bracket today y now to be see if I can find a 10PA20C.
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Peach Parts W124.128 User Group.

80 280SL
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90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
92 300TE 4Matic
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  #13  
Old 09-12-2015, 02:16 AM
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i am currently running the the 10PA17C and 350sdl bracket. fit no problem but the discharge line bracket doesn't match up to the lower rear bolt of the bigger compressor. should have got a new manifold made up with the 350's manifold/ muffler assembly and w124 ends to the condenser and evap. the compressor is brand new and is a valeo brand so not chinese BS. running R12, 1995 w124 condenser with the twin fans, new evap, fresh mineral oil and it kicks ass.
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  #14  
Old 09-13-2015, 12:44 PM
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Quote:
Originally Posted by BenzTurbo View Post
i am currently running the the 10PA17C and 350sdl bracket. fit no problem but the discharge line bracket doesn't match up to the lower rear bolt of the bigger compressor. should have got a new manifold made up with the 350's manifold/ muffler assembly and w124 ends to the condenser and evap. the compressor is brand new and is a valeo brand so not chinese BS. running R12, 1995 w124 condenser with the twin fans, new evap, fresh mineral oil and it kicks ass.
Is that a bracket from a W126 350SDL? If so, then that is the OM603.970 engine, not an OM603.971 found in the W140.
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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
92 300TE 4Matic
01 Saab 9-5 Wagon
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  #15  
Old 08-16-2016, 04:57 AM
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Quote:
Originally Posted by pwogaman View Post
Is that a bracket from a W126 350SDL? If so, then that is the OM603.970 engine, not an OM603.971 found in the W140.
Yes I'm running the w126 350sd/ sdl bracket (om603.970) which uses the 10PA17C. As far as i know when the om603.971 was introduced to the w140 body, it also received the larger 10PA20C compressor and bracket. I have that bracket as well so if my 17c ever needs replacing, i will upgrade it again along with a better condenser setup.

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