The Ford Barn

BrandonAv8 · 02-20-2013, 10:50 PM

I need some help. I just ordered a model b waterpump for my model b engine.
When I went to install the pump it did not sit flush with the head. When I compared it to the one that I took off it looked like the impeller stuck out a little farther. I was wondering if anyone ran across this or I just have a defective pump. Thanks Brandon

Carter · 02-20-2013, 11:15 PM

Make sure it is not just the end of the impeller shaft hitting inside the head.

Joe K · 02-20-2013, 11:15 PM

Probably not defective, but they may have assembled the pump with the pump shaft a little "proud" of the impeller, this in expectation of wear on the boss inside the cylinder hear (look in the round hole where you mount the pump and you'll see the boss. As the boss wears your free play on the shaft increases.)

This extra may be their "norm" to provide as they may be expecting users to chuck the shaft in a lathe and turn back this shaft to create for themselves the target 0.005 to 0.010 end play.

Talk with your supplier about this. You may be able to give him some dimensions over the phone and he can determine if your pump is indeed defective or maybe he has another one which will fit better and save you the lathework.

Joe K

BrandonAv8 · 02-20-2013, 11:24 PM

Thanks Joe. Sounds like I will call them and hopefully get some answers.

Geo. H · 02-21-2013, 01:18 AM

Are you running a stock head? The one with a big "C" on it? That head has a CR of about 4.6 to one. I run a B engine, but with a 5.9 CR Model A head. That also means I use a Model A water pump. Works for me.

columbiA · 02-21-2013, 01:44 AM

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I ran across the same problem when I installed a new shaft with impeller already pressed on in my B wp.The pump was about 3/8" short of meeting the head.I had to remove the repro impeller & install the old one,then it fit OK.The front of the new one was not machined deep enough.One more instance of crappy repro parts.I also drilled a 3/32" hole thru the imp & shaft & installed a roll pin.Sometimes when an imp is reused,they will not fit quite as tight as they should.If the imp was to come loose,the fan could propel itself into the rad.

BrandonAv8 · 02-21-2013, 07:19 AM

That is my problem. My impeller is to worn to put it in. I'll call today to see if I can return it.

02-20-2013, 10:50 PM	#1
BrandonAv8 Junior Member Join Date: Jan 2013 Location: Rhode Island Posts: 7	Model b waterpump help I need some help. I just ordered a model b waterpump for my model b engine. When I went to install the pump it did not sit flush with the head. When I compared it to the one that I took off it looked like the impeller stuck out a little farther. I was wondering if anyone ran across this or I just have a defective pump. Thanks Brandon

02-20-2013, 11:15 PM	#2
Carter Senior Member Join Date: May 2010 Location: New Castle, PA Posts: 383	Re: Model b waterpump help Make sure it is not just the end of the impeller shaft hitting inside the head.

02-20-2013, 11:15 PM	#3
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Model b waterpump help Probably not defective, but they may have assembled the pump with the pump shaft a little "proud" of the impeller, this in expectation of wear on the boss inside the cylinder hear (look in the round hole where you mount the pump and you'll see the boss. As the boss wears your free play on the shaft increases.) This extra may be their "norm" to provide as they may be expecting users to chuck the shaft in a lathe and turn back this shaft to create for themselves the target 0.005 to 0.010 end play. Talk with your supplier about this. You may be able to give him some dimensions over the phone and he can determine if your pump is indeed defective or maybe he has another one which will fit better and save you the lathework. Joe K __________________ Shudda kept the horse.

02-20-2013, 11:24 PM	#4
BrandonAv8 Junior Member Join Date: Jan 2013 Location: Rhode Island Posts: 7	Re: Model b waterpump help Thanks Joe. Sounds like I will call them and hopefully get some answers.

02-21-2013, 01:18 AM	#5
Geo. H Senior Member Join Date: May 2010 Posts: 374	Re: Model b waterpump help Are you running a stock head? The one with a big "C" on it? That head has a CR of about 4.6 to one. I run a B engine, but with a 5.9 CR Model A head. That also means I use a Model A water pump. Works for me.

02-21-2013, 01:44 AM	#6
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: Model b waterpump help Sponsored Links (Register now to hide all advertisements) I ran across the same problem when I installed a new shaft with impeller already pressed on in my B wp.The pump was about 3/8" short of meeting the head.I had to remove the repro impeller & install the old one,then it fit OK.The front of the new one was not machined deep enough.One more instance of crappy repro parts.I also drilled a 3/32" hole thru the imp & shaft & installed a roll pin.Sometimes when an imp is reused,they will not fit quite as tight as they should.If the imp was to come loose,the fan could propel itself into the rad.

02-21-2013, 07:19 AM	#7
BrandonAv8 Junior Member Join Date: Jan 2013 Location: Rhode Island Posts: 7	Re: Model b waterpump help That is my problem. My impeller is to worn to put it in. I'll call today to see if I can return it.