New water pump issue

[Alger]

Installing a new water pump in a 1966 830 Case Tractor diesel with the 301 engine in it. The new and old water pump have an approximate 3/8 inch diameter hole in the top of them that are threaded. The old plug will not remove it. It’s only been there 50 years grabbed a 3/8 pipe plug to plug the hole. But the threads don’t match. Can anyone share size and thread type for this plug? Thank you

 

[bradley martin]

Installing a new water pump in a 1966 830 Case Tractor diesel with the 301 engine in it. The new and old water pump have an approximate 3/8 inch diameter hole in the top of them that are threaded. The old plug will not remove it. It’s only been there 50 years grabbed a 3/8 pipe plug to plug the hole. But the threads don’t match. Can anyone share size and thread type for this plug? Thank you

I just replaced the water pump on a 930 diesel. I know it is a different pump than the 830 but the smaller hole on mine took a 3/8 " pipe thread, larger hole took a 3/4" plug. My replacement pump came from Parts ASAP (host of this forum. see my current post on Tractor Talk). I did just look up the pump for the 830 and it shows NLA from Case. However, the Case pump shows a 3/8" pipe plug. Check with whoever you got your replacement pump from.

 

[Joe (Wa)]

Diameter of 3/8 npt pipe plug major thread is .675 inch. The zerk fitting #9 hole can be about .44 inch for the older style zerk with 1/8 inch npt pipe thread, that's the same tpi as a 7/16 inch bolt thread that is not a taper pipe type thread.