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Allis Chalmers Discussion Forum

B water pump replacement

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Author  [Modern View]

11-08-2011 04:23:33

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Hi, A friend needs me to come out and replace the
water pump in his '51? B. He does not have a book
and I'm not a true mechanic. Anything tricky? Rad
need to come off? Thanks for anything. Chuck

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11-09-2011 15:57:21

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 Re: B water pump replacement in reply to chuck41, 11-08-2011 04:23:33  
Many thanks to each of you for responses. I may
need to do soon so needed some confidence. Chuck

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11-09-2011 16:57:46

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 Re: B water pump replacement in reply to chuck41, 11-09-2011 15:57:21  
If I where you and you do not have a problem with the thermostat I would not even try to look at it. Reason I say that is you stand a 80% chance the bolts will brake and then you have a big problem on your hands. BTDT and the last one I did I had to weld nuts on the broken off pieces of bolt so they could be removed and new ones put back in

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Paul from MI

11-08-2011 18:07:22

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 Re: B water pump replacement in reply to chuck41, 11-08-2011 04:23:33  
Might as well plan on replacing the thermostat while you are there. Frequently rusted through, so may as well fix it, or at least check it out. Good luck,

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11-08-2011 19:57:14

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 Re: B water pump replacement in reply to Paul from MI, 11-08-2011 18:07:22  
you try taking those two 5 inch long bolts out of the thermostat housing and your liable to snap one off. THey will be 50% rusted thru inside.. Then you will have to remove wiht vice grips or drill out. Not saying that looking at thermostat is not a good idea, but you may be in for more than you thought if you remove the thero housing.

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Dick L

11-11-2011 11:02:42

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 Re: B water pump replacement in reply to steve(ill), 11-08-2011 19:57:14  
Never snapped on off Steve. I put heat on the thread area of the head before I put a wrench on the bolt.

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11-08-2011 07:56:11

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 Re: B water pump replacement in reply to chuck41, 11-08-2011 04:23:33  
Pull the hood off and from there you should pretty much see all that has to be done to it. The hardest part will be the hose since it is probably old and will not want to come off

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bjb in Tx from Ne

11-08-2011 04:57:49

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 Re: B water pump replacement in reply to chuck41, 11-08-2011 04:23:33  
If I recall correctly I think you do have to take the radiator off. Having the radiator off also makes removing and replacing the lower water pipe much easier. Make sure you replace the hoses at this time too.

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Mark - IN.

11-09-2011 17:06:23

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 Re: B water pump replacement in reply to bjb in Tx from Ne, 11-08-2011 04:57:49  
I don't remember if I had to take the radiator off or not. The only thing that I remember being odd though were adjusting screws on the pulley for the fan blade. I can't remember if were one or two or three where the bolt head was inside, between the pulley and the water pump, and the nuts and lock washers were outside of the pulley. Those adjusting bolts moved the fan blade closer to the radiator, or away from the radiator towards the engine. They were old, and I kind of remember one breaking, so I ended up replacing two or three, however many there were.

Hood has to come off. Radiator though? I can't remember.

Overall, was pretty simple. Again, onlu oddity was the adjusters of the fan blade that mounted to the pulley.

Good luck.


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11-09-2011 17:22:49

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 Re: B water pump replacement in reply to Mark - IN., 11-09-2011 17:06:23  
Mark just to let you know the pulley has 2 bolts to lock it I know because I have one laying right here on the desk

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