JD water pump

[Shadow_storm56]

Just a quick question.... in most JD water pumps how much clearance is normal between the impeller and the suction side of the pump case. I was having flow issues but couldn't see issue with the pump so was going to try to take the impeller off. Undid the snap rings and tried to tap the shaft out or atleast enough to see the full impeller better. Realized it wasn't going to come apart without damage I put it back in place snap rings and all..

Impeller was a different distance from the back of the case. I realized with just gentle hammer taps I can make the impeller shaft move in and out enough to go from credit card between impeller and case to impeller jammed against the case. In my original pictures the impeller was further than that away yet.

So I'm like did I create this issue from tapping on it or is this my problem? Bearing going and making the impeller too far out. I can't even see what's moving to change the distance.

So long story short what distance should there be between the suction side of the case and the suction side of the impeller. I would figure it should almost touch just a hair of space but maybe not

Tell me what you think? That was the gap as of taking the pump off

 

[OntheRidge]

Just a thought...

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[Shadow_storm56]

Just a thought...

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I'm there too, much less active fourm.

 

[jimh406]

For the water pumps on cars/trucks I've worked on, they are pretty much self-clearancing. That is, if the parts are new, and you have the right gaskets, there is no thinking required.

As long as the impeller blades aren't rubbing, it's probably going to be fine.

 

[Shadow_storm56]

For the water pumps on cars/trucks I've worked on, they are pretty much self-clearancing. That is, if the parts are new, and you have the right gaskets, there is no thinking required.

As long as the impeller blades aren't rubbing, it's probably going to be fine.

This is the old pump, not getting good flow, nothing is plugged in the system and the only thing I can see is theres a fair bit of clearance on the suction side of that impeller. I always thought they were supposed to almost be touching the case

 

[NorthwoodsLife]

Tell me what you think?

Buy a brand-new JD water pump. Install it. And be done. JD and Yanmar make high quality equipment.

Respectfully, don't over think it. There is value in time and money by just replacing the whole darn thing.

 

[Yooper]

I just rebuilt the water pump on my Farmall H and it has more clearance than yours. I highly doubt your issue is the pump. What is happening that leads you in the direction of flow? How old is your tractor?

 

[Shadow_storm56]

I just rebuilt the water pump on my Farmall H and it has more clearance than yours. I highly doubt your issue is the pump. What is happening that leads you in the direction of flow? How old is your tractor?

4000 hours or so... 15 years ish. To put it simply as I already have another post on overall trouble shooting this machine it cannot push to the heater core except at high RPM. Had to put an electric pump in line to get heat as a temporary fix.

Also I looked online at videos of people changing them and sales videos trying to see that impeller clearance. From what I could see the clearance was barely anything. Hard to tell though

 

[mcfarmall]

I'm there too, much less active fourm.

Yes. JD's never break down

 

[Shadow_storm56]

Yes. JD's never break down

Right

 

[GeoHorn]

I ran across an overheating problem on my JD 4230 engine which was a water pump impeller which would spin on it’s shaft…thereby not moving much water under load. It looked perfect…but would spin on it’s own shaft. I replaced the entire pump and solved the problem after wasting much time replacing thermostat, cleaning radiator…and all the other things that could cause overheating …because the pump appeared to be in such good condition. It wasn’t until I discovered the impeller slipped on it’s own shaft before the problem was solved.

 

[Shadow_storm56]

I ran across an overheating problem on my JD 4230 engine which was a water pump impeller which would spin on it’s shaft…thereby not moving much water under load. It looked perfect…but would spin on it’s own shaft. I replaced the entire pump and solved the problem after wasting much time replacing thermostat, cleaning radiator…and all the other things that could cause overheating …because the pump appeared to be in such good condition. It wasn’t until I discovered the impeller slipped on it’s own shaft before the problem was solved.

This one when I looked at the new vs old the old had 1.5 x the impeller to casing clearance and just with a gentle hammer tap could slide in and out enough to go from that clearance to jammed against the case . I haven't gotten it on yet but I'd say it is definitely the pump

 

[GeoHorn]

BTW… My JD 4239 engine sits in an asphalt roller I use to compact my turf runways to keep the hogs off. Works great. But finding a water pump was a reach. I finally found a heavy-equipment replacement-parts dealer “up nawth” who educated me that the casting-number on the water pump could be used to discover the correct pump. (The shaft-length to accommodate the pulley was the issue) Solved the problem.
Here’s who helped me find the correct pump: https://www.conequip.com/