Failed Graf Water Pump:

Sir Sam · **Posted:** Sat Dec 31, 2016 4:26 pm

Video:

https://www.youtube.com/watch?v=NXhZtVE3Jtc

In followup to this thread:

viewtopic.php?f=5&t=85777&p=902734&hilit=water+pump+not+pumping#p902734

jws84_02 · **Posted:** Sat Dec 31, 2016 4:32 pm

Wow. For some reason there wasn't any sound for me on the video. I think it's on my end(bad service). Do you know how many miles was on the pump

Sir Sam · **Posted:** Sat Dec 31, 2016 5:08 pm

jws84_02 wrote:

Wow. For some reason there wasn't any sound for me on the video. I think it's on my end(bad service). Do you know how many miles was on the pump

Went and checked. 172 miles.

LMWatBullRun · **Posted:** Sat Dec 31, 2016 6:35 pm

Wow!

Graf has a good reputation.

Had?

Hmmmm.

Mountainman · **Posted:** Sat Dec 31, 2016 7:19 pm

This will make me feel the bearings on the new ones for sure. Thanks for the post

Sir Sam · **Posted:** Sat Dec 31, 2016 9:32 pm

Mountainman wrote:

This will make me feel the bearings on the new ones for sure. Thanks for the post

The bearings and seals are all perfect, just the brass impeller did not stay pressed onto the shaft.

Mountainman · **Posted:** Sat Dec 31, 2016 11:54 pm

Sir Sam wrote:

Mountainman wrote:

This will make me feel the bearings on the new ones for sure. Thanks for the post

The bearings and seals are all perfect, just the brass impeller did not stay pressed onto the shaft.

OK, thanks. I guess I'll hold both sides and test them with a little pressure. Do you have another one to compare it to to see if it's something we can identify visually?

Sir Sam · **Posted:** Sun Jan 01, 2017 12:04 am

Mountainman wrote:

Sir Sam wrote:

Mountainman wrote:

This will make me feel the bearings on the new ones for sure. Thanks for the post

The bearings and seals are all perfect, just the brass impeller did not stay pressed onto the shaft.

OK, thanks. I guess I'll hold both sides and test them with a little pressure. Do you have another one to compare it to to see if it's something we can identify visually?

Also really nothing to see - either it spins or it doesn't. As you can see it moves very easily. It was tight when installed, maybe heat caused it to loosen enough to spin?

GordnadoCRD · **Posted:** Sun Jan 01, 2017 12:19 am

Isn't Graf the OEM manufacturer?

Sir Sam · **Posted:** Sun Jan 01, 2017 1:26 am

GordnadoCRD wrote:

Isn't Graf the OEM manufacturer?

Nope. The OEM pump is a VM branded water pump. Construction of the OEM pump is different than the GRAF pump.

flman · **Posted:** Mon Jan 02, 2017 12:33 pm

So much for the highly acclaimed Graf? :roll:

Mountainman · **Posted:** Mon Jan 02, 2017 1:05 pm

Whoever pressed the impeller onto the shaft should have noticed that it was loose, unless a machine assembles them? I bet we can catch this by testing it with a good amount of counter force, but not too much, maybe?

Jay ne Ohio · **Joined:** Sun Dec 12, 2010 5:49 pm **Posts:** 216

I bought one last week. Not sure whether I want to install it now. I will look at it closely and see if I can see any issues.

Sir Sam · **Posted:** Mon Jan 02, 2017 3:28 pm

Mountainman wrote:

Whoever pressed the impeller onto the shaft should have noticed that it was loose, unless a machine assembles them? I bet we can catch this by testing it with a good amount of counter force, but not too much, maybe?

Well it wasn't loose when it was installed. Maybe the press fit wasn't as tight as it should have been.....but how would you know? You would have to measure pressing force during install, I'm not sure thats part of the assembly step.

Sir Sam · **Posted:** Mon Jan 02, 2017 3:30 pm

Jay ne Ohio wrote:

I bought one last week. Not sure whether I want to install it now. I will look at it closely and see if I can see any issues.

Always good to look over parts before install. Bear in mind lots of other Graf pumps have been installed and we haven't had reported issues with those. Still nothing is perfect and parts do fail.

GordnadoCRD · **Posted:** Mon Jan 02, 2017 3:47 pm

I would guess if it's supposed to be a friction fit, if you mechanically hold the pulley, and can put a rag around the impeller to protect your hand, and cannot by hand, spin it on the shaft, it's probably safe to use. Wouldn't try that with a plastic one though.

LMWatBullRun · **Posted:** Mon Jan 02, 2017 4:31 pm

Sir Sam wrote:

Jay ne Ohio wrote:

I bought one last week. Not sure whether I want to install it now. I will look at it closely and see if I can see any issues.

Always good to look over parts before install. Bear in mind lots of other Graf pumps have been installed and we haven't had reported issues with those. Still nothing is perfect and parts do fail.

I suppose if both components are metal, then you could drill it and pin it.

papaindigo · **Posted:** Mon Jan 02, 2017 4:35 pm

I'm sort of surprised it's not pinned or keyed to the shaft.

GordnadoCRD · **Posted:** Mon Jan 02, 2017 5:04 pm

X2

I wouldn't do it myself though, if it's still under warranty.

Sir Sam · **Posted:** Mon Jan 02, 2017 7:10 pm

GordnadoCRD wrote:

X2

I wouldn't do it myself though, if it's still under warranty.

Meh, not worth trying to fix. Too much is riding on the water pump working. If the bearings fail the rockers go out. For the trouble of pulling the Jeep apart you might as well just replace it.

Failed Graf Water Pump:

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