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#1
09-12-2010, 11:21 PM
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OM617A Water Pump Differences
I'm getting an om617A engine ready to swap in and as part of the prep I replaced the water pump. The fan pulley won't fit over the shaft of the pump. The interchange book listed 77-85 300Ds and 81-85 300SDs for this pump.
I guess what I'd like to know is if the pulley I have is an oddball, or if the new pump is. The pulley fit the old pump so a pump exists that fits this but I'm not sure where any of it came from on this engine. -Tad
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1995 G320 2003 C230 Kompressor Coupe 2005 ML500 2007 ML350 
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#2
09-13-2010, 02:28 AM
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mb built a lot of very similar pumps with minor details for the application. I would take it back and tell them what I needed and let them sort it out.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
09-13-2010, 02:50 PM
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Just for clarity's sake; the W115 617 has a different water pump than the 123 617's and the van 616 and 617's have a number of different water pumps that are not compatible with the car versions.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#5
09-13-2010, 04:14 PM
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I'll take my pulley with me to the parts store. If it doesn't fit any there I'll start shopping for a standard 617a water pump pulley.
I bought this water pump 6 months ago (it's been a slow spring) so it won't be returned, but for the price I'll spring for one that fits. -Tad
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1995 G320 2003 C230 Kompressor Coupe 2005 ML500 2007 ML350
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#6
09-13-2010, 04:20 PM
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Would there be a benefit of putting a smaller 84-85 pulley on an 82 to spin the pump faster? It seems like water circulation is just not adequate at low engine speed...
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#8
09-13-2010, 08:45 PM
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Well the ******** water pump for a 1981 300SD has a center shaft that is too big. It is a GATES #41160. The pump I got from Advance Auto for a 1983 300SD does have the correct shaft size though. Go figure.
Thanks for the advice all. I'll install an aux water pump on a switch for the heater core for now. -Tad
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1995 G320 2003 C230 Kompressor Coupe 2005 ML500 2007 ML350
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#9
09-14-2010, 06:35 AM
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Quote:
The difference is something like 0.9:1 instead of 1.09:1. There is a TSB about it if somebody has access to AllData to get it.
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Linear Mode
