|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
09-09-2016, 12:36 PM | #1 |
Member
Join Date: Jul 2016
Location: Princeton, LA
Posts: 77
|
Help Water Pump.
IMG_0220[2].jpg
IMG_0235[1].jpgI haven't own this car long and I notice there was too much end play in the water pump. About 1/2 inch. The fan will not go all the way on the shalt. I have some knowledge in mechanics so I know this isn't right. Question? Do I have the right water pump and wrong fan or the right fan and wrong water pump.
__________________
1931 Model A Coupe Wisdom is not a product of schooling, but of a lifelong attempt to acquire it. |
09-09-2016, 01:10 PM | #2 |
Senior Member
Join Date: May 2010
Location: So Cal
Posts: 8,741
|
Re: Help Water Pump.
The water pump has to be bolted to the head to check the end play as the shaft
movement is limited by part of the casting in the head. This casting wears and the end of the shaft can be built up, a longer shaft installed or a collar installed on the shaft to limit its movement. Bob |
Sponsored Links (Register now to hide all advertisements) |
|
09-09-2016, 01:11 PM | #3 |
Senior Member
Join Date: May 2010
Location: Pitt Meadows BC
Posts: 1,003
|
Re: Help Water Pump.
Fan and pump look compatible but the rear of the pump shaft is short allowing end play excess. Try changing the shaft or build in up with weld so do reduce the end play. I think it should only be .006. Check the head and see how much the thrust block in the pump housing is worn.
|
09-09-2016, 01:25 PM | #4 | |
Member
Join Date: Jul 2016
Location: Princeton, LA
Posts: 77
|
Re: Help Water Pump.
Quote:
__________________
1931 Model A Coupe Wisdom is not a product of schooling, but of a lifelong attempt to acquire it. |
|
09-09-2016, 01:31 PM | #5 |
Senior Member
Join Date: Apr 2011
Location: Davenport, Iowa
Posts: 2,108
|
Re: Help Water Pump.
Some repo shafts do not have the correct taper for original fans, and some repo fans do not have correct taper for original shafts. There was a run of both bad batches a few years ago with lots of similar complaints about not fitting. Is the fan metal or aluminum? 'Can't tell from your pump photos if these are original or older repo parts. A few years running repo parts in the water pump can cause them to look really old, especially if there is coolant leakage.
You can take a file and reshape the pump shaft end until the fan will fit on. I have also used a hand grinder to do the rough forming, followed by a hand file for final shaping. Go slow and fit often until the fan can be slipped snugly onto the shaft, far enough for the woodruff key to lock it into place. Ensure that the woodruff key is not too large or you'll never get the fan to fit. Marshall |
09-09-2016, 01:35 PM | #6 |
Senior Member
Join Date: Apr 2011
Location: Davenport, Iowa
Posts: 2,108
|
Re: Help Water Pump.
Sponsored Links (Register now to hide all advertisements)
Marshall |
09-09-2016, 02:30 PM | #7 |
Senior Member
Join Date: Apr 2011
Location: Davenport, Iowa
Posts: 2,108
|
Re: Help Water Pump.
To reduce the end play of the shaft, the impeller must be driven farther up the shaft. To do this, open the jaws of a well-anchored vise and place the pump in with the back of the impeller resting on top of the vise jaws. Tighten the vise just enough so that the jaws touch the nipple end of the shaft. This rests as much of the impeller backside surface area as possible on the vise. Now take a BFH and strike the castle nut end of the shaft several times. The end of the shaft is usually even with the castle nut, so no smashing harm will come to either. That's also why you are using a heavy hammer, requiring only a few forceful strikes instead of a lighter hammer and many strikes. In this case, fewer is better.
Anyway, as you strike the end of the water pump shaft, that will drive the shaft "down" and impeller "up" the shaft. After a few whacks, remove the pump from the vise and check for end play. You want the impeller to fit close to the rear bushing inside the water pump body, but not binding against it. That odd-shaped flat impeller spacer will help maintain the proper distance. If necessary, repeat this hammering process until the impeller is where it should be. You will note that it has moved by the change in color on the shaft where the impeller had been. Once you have attained the proper spacing, TEST FIT the pump to the cylinder head. You have effectively moved the shaft deeper into the cylinder head recess, so you may have file or grind away some meat on the end of the shaft to make it fits properly and still be able to spin. The idea is to have the end of the shaft spin inside the special flat recess just inside the head. That was originally intended to supply initial "pre-load" of the shaft. As the years passed, however, that area is probably well worn down. You may have to taper the end of the shaft after grinding because as you go up the shaft past the initial factory bevel, it gets thicker. Test fit the pump without a gasket first. When it is correctly fitted, you may feel a slight resistance when spinning the shaft. Now try test fitting with a gasket in place. No resistance should be felt. Then you are done. You could stake the impeller in place with a small Allen head set screw, but generally this is not necessary. Some guys may cringe at the suggestion of whacking the end of the water pump shaft with a BFH. But that impeller moves realtively easily. If someone who wears suspenders and a belt is worried about ruining the end of the shaft and/or castle nut, he can remove the nut and re-install it backwards until it is flush with the end of the shaft. Then bang away! I have made loose water pump shafts with too much end play serviceable again using this procedure on many Model A's. It works! Marshall |
09-09-2016, 02:32 PM | #8 | |
Member
Join Date: Jul 2016
Location: Princeton, LA
Posts: 77
|
Re: Help Water Pump.
Quote:
__________________
1931 Model A Coupe Wisdom is not a product of schooling, but of a lifelong attempt to acquire it. |
|
09-09-2016, 02:37 PM | #9 |
Senior Member
Join Date: Apr 2013
Location: Big pine Ca 93513
Posts: 797
|
Re: Help Water Pump.
Throw it in the ditch and buy a leakless.
|
09-09-2016, 02:43 PM | #10 | |
Member
Join Date: Jul 2016
Location: Princeton, LA
Posts: 77
|
Re: Help Water Pump.
Quote:
__________________
1931 Model A Coupe Wisdom is not a product of schooling, but of a lifelong attempt to acquire it. |
|
09-09-2016, 02:45 PM | #11 |
Member
Join Date: Jul 2016
Location: Princeton, LA
Posts: 77
|
Re: Help Water Pump.
Come to think of it, I have one coming. But I still would like to know how to repair this one. Thanks Johnny
__________________
1931 Model A Coupe Wisdom is not a product of schooling, but of a lifelong attempt to acquire it. |
09-09-2016, 02:57 PM | #12 |
Senior Member
Join Date: Apr 2011
Location: Davenport, Iowa
Posts: 2,108
|
Re: Help Water Pump.
Over the years, guys have staked their water pump impellers to the back of the shaft. Before you and your BFH go to work, look the impeller over for a slot head set screw or Allen head set screw. If present, remove that first.
Marshall |
09-09-2016, 04:55 PM | #13 |
Member
Join Date: Jul 2016
Location: Princeton, LA
Posts: 77
|
Re: Help Water Pump.
Thanks, will do.
__________________
1931 Model A Coupe Wisdom is not a product of schooling, but of a lifelong attempt to acquire it. |
09-09-2016, 05:10 PM | #14 |
Senior Member
Join Date: May 2010
Location: on the Littlefield
Posts: 6,156
|
Re: Help Water Pump.
I tapped the thrust surface in the head and put a pan head screw in it so standard stock shafts would fit. --- the water pump in the car for the last 25 years was made with parts removed to make a leak less pump---- the leak less pump has been replaced 3 times, still using my not leaking stock pump
|
09-09-2016, 05:37 PM | #15 |
Senior Member
Join Date: May 2010
Location: Maryland
Posts: 145
|
Re: Help Water Pump.
It looks to have extra spacers @ the impeller, that will make less room up front..
|
09-09-2016, 10:38 PM | #16 |
BANNED
Join Date: May 2012
Location: inside your RAM
Posts: 3,134
|
Re: Help Water Pump.
how did it work before you took it apart?
you can gently grind some off the nut using the side of your bench grinder stone
__________________
'31 180A |
09-09-2016, 11:56 PM | #17 |
Senior Member
|
Re: Help Water Pump.
This thin collar with a nylon washer goes on the front of the pump to keep the shaft and fan from moving back and forth.
__________________
What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do some thing about them. - Henry Ford II |
09-10-2016, 03:18 AM | #18 |
Senior Member
Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
|
Re: Help Water Pump.
|
09-10-2016, 05:31 AM | #19 |
Senior Member
Join Date: May 2010
Location: Rhode Island
Posts: 1,868
|
Re: Help Water Pump.
Buy a new fan if you have the same fitting problem with your new pump. As said some older fans were defective. They are made by one manufacturer and are all good now.
|
09-10-2016, 09:36 AM | #20 |
Senior Member
Join Date: Sep 2011
Location: canton,michigan
Posts: 312
|
Re: Help Water Pump.
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|