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#1
12-11-2006, 06:17 AM
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Aux Water Pump
From a quick study of the parts catalog, it appears that all cars that use an aux water pump use the same part. Can anyone verify if this is true, or true only for certain years?
I may be doing so junk yard prospecting,and want to know what cars I can look at for the aux water pump. Is there a quick way to test them in the junk yard to see if they are good? Thanks
__________________
1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags 
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#2
12-11-2006, 11:16 AM
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barkin' up a tree ...
Dude, you just may be ahead to bite the bullet, get online and order a new one. I think I paid about 80 bucks for a one .... but only after checking all four of my wrecks. They were all junk. You can always put 12 volts to the contacts on the pigtail .... if it doesn't spin, it's dead.
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78 300d 158k driver 80 300d 200k fixer 80 300d parts car 98 Cherokee 240k " I know for certain that someday while parking or un-parking my Jeep Cherokee, I'm gonna' either pull the headlight switch right outa' its dashboard OR stomp its hood release lever clean offa' the kick panel. It's just a matter of which will happen first." 
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#3
12-11-2006, 12:58 PM
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I know 81 thru 85 123 chassis use the same pump.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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#4
12-11-2006, 02:30 PM
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I got one from a W129 that used a different impeller, and the brushes in the motor were not replaceable. It was dead so I stuck the impeller and housing on a W123 motor.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#5
12-12-2006, 07:10 AM
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Yeah, I know I should buy a new one (and support Phil),but I'm cheap--or rather "thrifty".
Can they be tested w/o applying 12 volts--the junkyard won't let anyone carry a battery in the yard. They don'tallow digital tester either--but I am able to hide one so I can usually get it in.
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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags
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#6
12-12-2006, 11:49 AM
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A 9 volt battery or a small 12v lithium ion battery (the kind used for cordless tools)might be able to spin it.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#7
12-12-2006, 12:05 PM
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Aux Water Pump
Please do yourself a favor and buy a new pump.
Mine just went and I was able to get one for 72 dollars at http://www.mercedes-benz-parts-direct.com/epc-items.asp When you figure that it takes about an hour to pull the pump, plus the fact that you can blow the CCU by hooking up a pump that draws too much juice, you are much better off buying a known good replacement part. Good luck
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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