37-39 Water Pumps

[FlatheadEric]

Could someone please tell me how much end float the pulley/impellor shaft should have on a correctly assembled, good condition, original 37-39 water pump? (Half inch diameter pulley/impellor shaft with the bronze bush)
Is 3mm end float good or bad?

 

[G.M.]

The pulley moves forward about 3/16" when engine RPM's are increased on
pumps with spring loaded seals. With engine off you should be able to move
the pulley forward towards the radiator 3/16" it should spring back every time
you release it. There are also pumps that the bearing is made on the shaft that
stay in a fixed position and that pulley don't move forward. I prefer the ones
that move. G.M.

 

[FlatheadEric]

Thanks G.M.
That is what both pumps do. I can move them both forward 3-4mm (3/16") and they return when I release them.
I just received these pumps and on installing them I found that the left hand pump is dripping water so it looks like a new seal is required.

 

[Phil Gillespie]

Thanks G.M.
That is what both pumps do. I can move them both forward 3-4mm (3/16") and they return when I release them.
I just received these pumps and on installing them I found that the left hand pump is dripping water so it looks like a new seal is required.

Did you get them local in NZ. If so return for replacement.
Overseas with shipping not viable.
Phil NZ

 

[Mart]

If the leaking one pulls forward and springs back, it might be ok after putting a few miles on it.

Mart.

 

[G.M.]

Thanks G.M.
That is what both pumps do. I can move them both forward 3-4mm (3/16") and they return when I release them.
I just received these pumps and on installing them I found that the left hand pump is dripping water so it looks like a new seal is required.

Run the pumps for a 1/2 hour with some water pump lubricant. While
running at a fast idle take a small piece of wood and move the pulley
forward and push it back against the seal. G.M.

 

[G.M.]

Did you get them local in NZ. If so return for replacement.
Overseas with shipping not viable.
Phil NZ

Also make sure the bolts are not to long if they bottom out the gasket
is not getting squeezed tight and the leak looks like the seal is leaking.
If I recall the bolts are 7/8" long. G.M.