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#1
12-02-2014, 10:23 AM
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How significant is AC compressor belt drag?
The AC on my 84 300D does not work and I'm not interested in getting it to work. Since the car uses separate belts, it made me wonder whether the drag on the disengaged AC compressor is significant enough to warrant removing it.
Thoughts?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
12-02-2014, 10:34 AM
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No, not with the compressor not engaging...
estimates of ac drag WHEN WORKING... 5 to 7 old York , 4 to 6 R4, 3 to 5 modern linear piston swash plate types...
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#3
12-02-2014, 10:36 AM
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The drag is mostly insignificant, but having the belt there without ever using the compressor could cause a problem one day (not likely, but the potential is there). The bearing in the compressor clutch could go bad, the belt could fray and take out the other belts, etc. Since you don't plan on using the A/C, you might as well remove the compressor and save some weight. If you do, please cap/plug the lines somehow so no moisture/dirt gets in. The next owner (or you should you decide you want A/C someday) will thank you. Chances are the R4 compressor is bad anyway, so it will need to be removed someday, so why not now? (just my opinion).......Rich
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 All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html
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#5
12-02-2014, 10:50 AM
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Quote:
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html
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#6
12-02-2014, 11:00 AM
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One item for future use of the AC if that is possible... if for instance the problem was just in the wiring of the car.. or the dash....
not a loss of refrigerant for example... then the compressor ought to be ' jumped ' to turn on a couple of times per year... to lube the front shaft seal.... this is a designed ' leak' to get oil to that seal... and that is the only way to lube it.....
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#7
12-02-2014, 11:31 AM
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Quote:
the a/c has it's own belt, driving nothing else, and it is neutrally ballanced. also, it's on the same side of the motor as the Power Steering pump, so tension on the crank pulley wouldn't be affected by removing it either. I'd cut it and call it a day. removing all the stuff will lighten the front of your vehicle, but it's a messy job, and leaves a lot of open hoses to seal up. if you do remove it, take the mount as well. then when your oil cooler hoses need replacing, it'll be a snap.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
12-02-2014, 05:24 PM
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I'm with the leave it alone or at most cut the belt crowd. Well, I'm actually with the fix it and have working A/C crowd but in RI, it is not like you need A/C as bad as we do in TX.
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#9
12-02-2014, 05:33 PM
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Quote:
__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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