8n water pump

ckwapiti

New User
After 35 years of running my 48 8N I have to change the water pump. After removal discovered a quarter inch hole in the block which penetrates the water jacket and a corresponding hole in the back plate of the water pump, however there is a plastic plug in the hole. I don't understand why it is plugged, or should it be open to allow some water into the suction of the pump.
 
(quoted from post at 10:51:14 08/21/19) After 35 years of running my 48 8N I have to change the water pump. After removal discovered a quarter inch hole in the block which penetrates the water jacket and a corresponding hole in the back plate of the water pump, however there is a plastic plug in the hole. I don't understand why it is plugged, or should it be open to allow some water into the suction of the pump.
uction is from lower radiator hose & into pump. Discharge into block.
 
(quoted from post at 12:33:17 08/21/19) You are correct..however this hole in the back plate is on the suction side of the pomp]
guess I would have to see that. Doesn't make sense as to what I remember.
 
(quoted from post at 09:51:14 08/21/19) After 35 years of running my 48 8N I have to change the water pump. After removal discovered a quarter inch hole in the block which penetrates the water jacket and a corresponding hole in the back plate of the water pump, however there is a plastic plug in the hole. I don't understand why it is plugged, or should it be open to allow some water into the suction of the pump.

It's POSSIBLE at one point that the plastic plug was used to keep the gasket with the pump during handling and shipping, and the guy who installed the pump thought it was supposed to be there.

I have seen a plastic plug used like that before a time or two, on new parts, to keep the gasket from getting lost, or, perhaps from falling to the bottom of the box and getting banged up during shipping by a heavy part.
 
(quoted from post at 13:55:53 08/21/19) The hole shows on all the drawings of the block, back plate and gasket in the parts/ assembly books
K, I see it now. Don't see it doing much of anything, myself. Looks like it would be inline with pump shaft about center of backside of impeller.
 
Just seems odd to have a passage thru the block,gasket and back plate and then plug it with a piece of plastic which they didn't have in 1948]
 
(quoted from post at 20:44:12 08/21/19) Just seems odd to have a passage thru the block,gasket and back plate and then plug it with a piece of plastic which they didn't have in 1948]
eep it or discard it, it will not matter.
 

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