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#1
13-08-21, 23:26
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M38A1 CDN3 water pump
Had a small mishap in the garage today, needless to say I’m out one water pump. I suspected it was getting ready to fail anyhow and questioned myself whether or not If go with it or replace it. Well now, no choice.
I have the three groove pulley. Only need a pump. Can anyone tell me whether OEM or aftermarket pumps will work, can I simply swap the pulley or is there a wide variation of shaft lengths and diameters? Alternatively, anyone have a NOS Cdn3 pump? Thanks Chris
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers 
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#2
14-08-21, 00:45
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To the best of my recollection the 3 pulley pump were the same pump as the earlier M38A1s, just the pulley was different. There was a modification on the early ones to put the bypass hose nipple onto them...can't remember if that was for the civilian pumps or the military.
I say they were the same because at one point the military bought a bunch of 2 pulley pumps and our BML machine shop in Winnipeg was tasked with making the 3 groove pulleys to replace the two groove. I do have a NOS CDN2/CDN3 pump sitting on the shelf, but it isn't going anywhere.
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#3
14-08-21, 03:32
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Napa
Chris: l purchased one at Napa about 5 years ago, and swapped out the pulley. I recorded part Napa part number PH505 in my notes, but it looks like WPK43004 or WPN 58454 might be what you need.
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1953 M37 CDN 1953 M38A1 CDN 1967 M38A1 CDN2 Last edited by Wayne Hingley; 14-08-21 at 03:41.
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#4
15-08-21, 00:05
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Thanks Wayne and Rob, I’ll look into it.
Can’t believe I messed up my pump, a little too zealous with the press and then a drop onto the concrete floor causing need for a new unit.
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers
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