SDLARS 12 Posted November 7, 2020 Share Posted November 7, 2020 My water pump is OK but got an email from The Filling Station the other day that got me wondering. They list a pump for Chevrolet, 1929-1934 with modern seals and bearings and it looks like a similar bolt pattern as the Pontiac. They say it replaces GM part number 601108. Anyone have any idea if they might interchange? Link to post Share on other sites
Kornkurt 29 Posted November 7, 2020 Share Posted November 7, 2020 601108 does not show up in any Pontiac parts book. Link to post Share on other sites
Tinindian 1,699 Posted November 7, 2020 Share Posted November 7, 2020 1930 Pontiac water pump #527614, P6 1929 to 490158 is #526853 and would also work. NOTHING ENGINE mechanical from Chevrolet fits Split head Pontiacs. The transmission case is the same but inside gears are different ratios because of the different torque and HP curves and the rear extension is different because 1929 and up split heads had "Hotchkiss" drive. Link to post Share on other sites
SDLARS 12 Posted November 8, 2020 Author Share Posted November 8, 2020 Good to know. Just curious. Thanks! Link to post Share on other sites
32Pontiac6 30 Posted November 24, 2020 Share Posted November 24, 2020 Another thing to put in the back of your mind is that the impeller and shaft is the same for '29-'32 (Group 1.003 and Part Number 526856). The difference is the body. The '32 is particularly unique because it has a water distribution tube that daylights at the pump and brings water to the rear head area. So finding an old pump from that series will allow a spare impeller and shaft. My other bias is that I like the old packing over mechanical seals. I have some Chevy friends who have used mechanically sealed pumps with great success. I replaced the mechanical seal on my '32 and it failed. I have gone back to the old packing and it works fine. I think the problem with packing is that owners have never replaced it and it is a bit of a mystery to them. Once you get the right packing and use it a time or two you realize that it is a good and simple solution. I run packing in both my '30 and '32. My two cents worth. 1 Link to post Share on other sites
SDLARS 12 Posted November 24, 2020 Author Share Posted November 24, 2020 I repacked my pump with packing from McMaster-Carr and all is well. It truly is an amazingly simple unit. I actually have no leaks although I have a pan under the car to monitor the situation. Next step is the radiator. I've found a shop that is reputable and isn't afraid to tackle a 90 year old unit. I'll let you know how it all works out. 1 Link to post Share on other sites
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