Water Pump Help

[Kevin Vogel]

Hello

Does anyone have any idea how to get the water pump apart? I'm a novice (at mechanical work) and scratching my head on this one. I see the key pin way inside, but it's difficult to get to it with any tool. Will this pump break down any other way? I see a small pin on the side, but not sure if I should try to knock it in or risk damage. Help anyone.

I bought the seal repair kit, but it won't help if I can't get the pump apart.

Thanks

Kevin

[Patrick Tipton]

TM 9-1772 says use a 3 leg puller to remove the impeller.  You will find the carbon washer, seal and seal spring on the inside of the impeller - held in place with a lock ring.

I am personally leery of pulling impellers because they are fragile little beasts and they have often been on these shafts for decades.  I like to use a puller to remove the pulley (not sure what that pin is in your picture - not shown in parts manual).  My puller was made by @Rob W and threads into the fan mounting holes....then presses the shaft so the pulley pops off.  From there, remove the clip in the weep hole in the last picture and you can press out the shaft and impeller.  Then you can press off the impeller.  It takes longer to write than it does to do.

Regards, Patrick

[OZM29C]

This is how I got my pulley off. I have made a strong back adaptor that bolts to the pulley flange. At the centre of the flange/adaptor I have added a hole which allows a drift to be positioned against the water pump shaft which in turn allows the pulley to be pressed off using a hydraulic press. The picture below better shows what I am describing.

[Patrick Tipton]

[5280Beltfed]

I used a big three jaw puller on the pulley, then pulled that retainer clip. Move to the press and place a large socket to clear the bearing/shaft on the front of pump while still supporting the casting. I use a small 1/4” socket to press the shaft/bearing thru the impeller into the big socket until it’s free and the shaft bearing combo will be almost out. Easy on the three jaw I’ve broken and bent pulleys on other vehicles in the past. 
Just an FYI if you have a large bearing separator big enough that the bolt holes clear the pulley I’d use that instead of the three jaw.
I noticed on my weasel pumps that the clearances of the impeller to housing had run-out. I corrected it by chucking the housing in the lathe and truing it. I didn’t have the manual at the time so I set the clearance to .013” and everything seems to be ok 😂 and still haven’t checked to see what it should be at so look it up!

Are you replacing the bearing shaft combo? It corrodes where the brass seal touches the shaft and that’s why they start leaking out the weep hole thru the bearing I use the impeller kit and a new bearing/shaft combo when rebuilding

Edited October 30, 2020 by 5280Beltfed

[Kevin Vogel]

Thanks for all the help guys.

I think I will print this info out and try to get a local mechanic to do this for me. I don't have the tools. I'll photo copy the book pages got from you Patrick a while back. I got the repair kit from Dave Yamulla (just came in the mail today).

Thanks

Kevin

[Patrick Tipton]

Sounds good Kevin.  For what its worth, the Harbor Freight hydraulic press is about $150 and goes on sale regularly.  Great thing to have in a shop and while it is not a great unit, it does work fine for these types of applications.

Patrick

[OZM29C]

@Kevin Vogel I have posted these photos and info here on the forum in a separate thread but I will post again to help you out. More that likely when you get your pump apart, the mechanical seal surface will be either worn or corroded. In my case as you can see in the photos, my seal surface was beyond redemption. I chose to machine and fit a replacement 316 stainless steel collar. Any competent machine shop could do this job. I used a generic Chinese water pump bearing and also machined it to size. I have had my engine running on a test stand and so far so good. The photos will better show what I am describing. Good luck with your repair.

Water pump bearing.pdf Water_pump_integral_shaft_bearings.pdf

[5280Beltfed]

58 minutes ago, OZM29C said:

@Kevin Vogel I have posted these photos and info here on the forum in a separate thread but I will post again to help you out. More that likely when you get your pump apart, the mechanical seal surface will be either worn or corroded. In my case as you can see in the photos, my seal surface was beyond redemption. I chose to machine and fit a replacement 316 stainless steel collar. Any competent machine shop could do this job. I used a generic Chinese water pump bearing and also machined it to size. I have had my engine running on a test stand and so far so good. The photos will better show what I am describing. Good luck with your repair.

Water pump bearing.pdf 53.95 kB · 0 downloads Water_pump_integral_shaft_bearings.pdf 265.85 kB · 0 downloads

Love it! I’d totally do that too instead of sealant. When I sold my resto-mod pickup the buyer asked if there were any special parts needed for the conversion. I said no not really🤪

[Lighthorse 31]

On 10/30/2020 at 3:48 PM, Patrick Tipton said:

TM 9-1772 says use a 3 leg puller to remove the impeller.  You will find the carbon washer, seal and seal spring on the inside of the impeller - held in place with a lock ring.

I am personally leery of pulling impellers because they are fragile little beasts and they have often been on these shafts for decades.  I like to use a puller to remove the pulley (not sure what that pin is in your picture - not shown in parts manual).  My puller was made by @Rob W and threads into the fan mounting holes....then presses the shaft so the pulley pops off.  From there, remove the clip in the weep hole in the last picture and you can press out the shaft and impeller.  Then you can press off the impeller.  It takes longer to write than it does to do.

Regards, Patrick

Hey Patrick (or anyone else who can help),

  The shaft is stuck solid in the body of my pump. It does spin and run really nice though. I can probably just leave it for now, but would really like to change, or at least inspect everything inside while it's out. However, the shaft is stuck solid into the body. Just to clarify, does it press out from the pully side toward the impeller side? If I place a socket or something of the right size against the bearing outer race and press there will I be reasonably assured not to damage the bearing?

 

Mark

[Patrick Tipton]

Mark - if you have a press....do it like this - exact same process......if you don't have a press...get one!🤣

 

 

[42rocker]

I've  used my HF press for a long time. Helped me with many a project. 

Good Luck on your water pump.

Stay Safe Everyone.

Later 42rocker

[Lighthorse 31]

2 hours ago, Patrick Tipton said:

Mark - if you have a press....do it like this - exact same process......if you don't have a press...get one!🤣

 

 

Well there it is! Guess I'm getting a press. Thank you sir!

[42rocker]

If you get HF then add the few extra dollars and get the 20 ton press.

Later 42rocker

[Lighthorse 31]

2 hours ago, 42rocker said:

If you get HF then add the few extra dollars and get the 20 ton press.

Later 42rocker

Totally, thanks for the advice rocker. Now I just need to find room for it in the garage. I did manage to convince our mechanic at work that he "needs" a sand blasting cabinet. So at least I don't need to get one of those, ha ha ha!

[Larry Mass]

Hi all my t15 water pump decided to start leaking now i am wandering if this is the right pump on it now and what would be the new number for a replacement. Crazy thing is i had the engine out and contemplated changing it but decided not to as the bearings were good now i have to change it in the machine.  I knew it would bite me in the ass.

Thanks 

Larry 

[Patrick Tipton]

Happens to me every time.  Thought - "fix this"....next thought...."its fine - we don't have time".  Result - 15 minute fix becomes 5 hour project.@Larry Mass🤣

I sent you another note - you need to get connected with Charlie S - who has a very nice T15 and can help you sort this out.

[M29]

That looks like the correct one

Dan

[Larry Mass]

Thanks guys i am amazed at how much help you can find on this site, so much knowledge thanks again. 

Larry