dravid Posted November 9, 2012 Share Posted November 9, 2012 Hi All I am a junior member and need help with my restoration. On the back plate of my water pump there is corrosion but I am not sure if the corrosion has caused it to develop into a hole or is there supposed to be a hole in that area. Please see pic for better understanding. Thank you in advance. Link to comment Share on other sites More sharing options...
ply33 Posted November 9, 2012 Share Posted November 9, 2012 Hi All I am a junior member and need help with my restoration. On the back plate of my water pump there is corrosion but I am not sure if the corrosion has caused it to develop into a hole or is there supposed to be a hole in that area. Please see pic for better understanding. Thank you in advance.That hole, maybe 1/4 inch in diameter, in your photo looks like the bypass hole on my '33s pump. Used to get some circulation in the block before the thermostat opens. Link to comment Share on other sites More sharing options...
dravid Posted November 12, 2012 Author Share Posted November 12, 2012 Thanks Ply33If you have pics please post Link to comment Share on other sites More sharing options...
ply33 Posted November 12, 2012 Share Posted November 12, 2012 Thanks Ply33If you have pics please postHere is the back of my spare water pump: Link to comment Share on other sites More sharing options...
dravid Posted November 14, 2012 Author Share Posted November 14, 2012 Thanks for this info Ply33. Judging from the pic of my water pump is it exactly the same as yours. If so would it be available for sale to me and at what cost. Link to comment Share on other sites More sharing options...
ply33 Posted November 14, 2012 Share Posted November 14, 2012 Thanks for this info Ply33. Judging from the pic of my water pump is it exactly the same as yours. If so would it be available for sale to me and at what cost.Not for sale.First, it is not the same pump as you need for the '31. The PA and PB use one pump body, the '33 and '34 pump uses a different one.Second: Since the '33 and '34 are different from other years I need a on hand spare: One on the car and the other rebuilt and sitting on the shelf ready to replace the one on the car. When (from experience not if) the one on the car fails, they get swapped and then I rebuild the failed one and put it back on the shelf. The alternative would be to have the car off the road while I get the parts and time to rebuild the one that failed and I don't want that, especially if I'm on a long tour. Link to comment Share on other sites More sharing options...
Graham Goetze Posted June 22, 2020 Share Posted June 22, 2020 Hi All. 1931 Plymouth PA : Can anyone explain why there is a large round hole in the block behind the water pump backing plate? The square hole is for coolant circulation but I don't understand the purpose of the round hole. See attached photo. Regards, Graham Link to comment Share on other sites More sharing options...
ArticiferTom Posted June 22, 2020 Share Posted June 22, 2020 Where bypass water come through . Hole size reduced at pump . See pic above . There maybe some machining or casting access done through it also . Link to comment Share on other sites More sharing options...
Graham Goetze Posted June 23, 2020 Share Posted June 23, 2020 Thanks for that. My backing didn't have the small hole as shown in the earlier pic. Did the 1931 PA have a thermostat? Link to comment Share on other sites More sharing options...
ArticiferTom Posted June 23, 2020 Share Posted June 23, 2020 Yes ,on thermostat . Link to comment Share on other sites More sharing options...
Graham Goetze Posted June 23, 2020 Share Posted June 23, 2020 Thanks I'll have to look for one. My car didn't come with one. Link to comment Share on other sites More sharing options...
ArticiferTom Posted June 23, 2020 Share Posted June 23, 2020 It goes in top of head ,where fitting of radiator hose mounts . I believe modern ones are available to fit . Link to comment Share on other sites More sharing options...
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