Water pump won't fit now.
 

If it isn't one thing it is another.I go back to working on the engine ,take the water pump out I bought new and it will not go in the manifold,hung up somewhere where it cannot go all the way in One I took off was fine as far as fit,thought I was improving by buying a leakless pump. I cannot get through to Bratton's by phone and I doubt they will help it has been over a year and it is marked Bratton's but came from Mac's and they will not help.I swear I am going to get this running and stick with my '37.

Re: Water pump won't fit now.
 

Does the new pump have a collar with a set screw to adj end play?? Put the pumps side by side, what are the differences??
Paul in CT

Re: Water pump won't fit now.
 

I agree assess the differences and maybe let us know so we can help with a solution. Some pump shafts were made longer to be able to fit the clearance in a worn head stop.

Re: Water pump won't fit now.
 

shaft end may be to long hitting head? If so grind some off.

Re: Water pump won't fit now.
 

PM sent

Re: Water pump won't fit now.
 

If so you want to shoot for .006 clearance with the gasket in place. Usually 0 clearance without the gasket.

Re: Water pump won't fit now.
 

Seriously a Model A needed shaft clearance inside? It looks to me like the impeller o.d is bigger than the recess for it.Iam talking about a good 3/16" gap when it will not go in any further.I will measure o.d tomorrow with my original. No phone anwering at Bratton's mayby because of the ice and storm.

Re: Water pump won't fit now.
 

We rebuilt a pump last week with parts from Snyders. In the kit it was explained that the new impeller shaft was 1/4 inch longer to take up the distance in the head from a worn boss. It said to grind the end till the pump fit tight to the head, then put on the gasket and install. Grind slow, check often.
Marty

Re: Water pump won't fit now.
 

Don't just check the OD, compare and measure the length of the shaft and shaft past the impeller to the casting. Compare everything and let us know what you find.

Re: Water pump won't fit now.
 

Okay thanks for the info.You think that there would be instructions on this with a complete new pump.I am done for the day and will check lengths tomorrow.

Re: Water pump won't fit now.
 

Yes,I appreciate all the help and will check everything out tomorrow and report back. Mayby I can get a hold of Brattons and ask if this is the norm and why no instructions. It still looks to me like the leading edge of the impeller blades are hitting first.

Re: Water pump won't fit now.
 

Missing instructions could be an omission at the manufacture/packaging point.

Re: Water pump won't fit now.
 

Mine barely touched the new 6:1 head I had installed. Had I known then what I know now I would have ground considerably more from the impeller. I know right where the rpm limit is otherwise it pushes coolant out the overflow. No it's not a radiator or overheat problem, it just plain pumps too much.

Re: Water pump won't fit now.
 

You can download Bratton's instructions here. https://www.brattons.com/30-31-new-l...ater-pump.html


Bob

Re: Water pump won't fit now.
 

Got it,Thank You and all. I guess I will work on it tomorrow and should be good. I do have another concern.Don't most water pumps turn or spin pretty freely? This seems knda snug,not really tight but is that because of the packing and it will loosen up? Been awhile since I had a water pump that used packing instead of a seal.

Re: Water pump won't fit now.
 

If it spins without binding it should be fine. Lube it up and go!

Re: Water pump won't fit now.
 

Must be quite a pump if it can pump out more than it can pull in from the bottom of the radiator! :confused:

Re: Water pump won't fit now.
 

It will be, till used some.

Re: Water pump won't fit now.
 

Put some yellow crayon or such on the areas of the pump you suspect are touching, rotate the shaft and see where the crayon rubs off.

Re: Water pump won't fit now.
 

I agree , my experience has been that the water pump just pumps too much . Snyders suggested years ago to modify the impeller . I grind the tips of the impeller blades . Snyders offers a modified impeller . This is pictured on page A-140 and they give the info that you need . You can get a good idea where to grind by looking at the pics if you decide to do it yourself .This mod will also slightly reduce some of the power that an over pumping water pump will draw .