Rebuild Yanmar water pump???

malyea

malyea

.
Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
So I was wiggling my table leg and my wife said, "hey, the water pumps leaking"......

Sure enough when our Yanmar 2GM (sea water cooled only) is idling, water drips out of the pump 1 drip every 3.175 seconds (drip slows to every 31.237 seconds at 2200 rpm)....

We might be taking her 180+ nm down the ICW to St Aug soooo, has anyone rebuilt a water pump using the rebuild kit (seals, bearings, clips, etc)?

The pumps only 33 years old and r/r costs over $450 and the kit may be less than half (and if it's just the seal ... Less than $10)......

Rebuild or replace the pump.....that is the question....

I'd place a premium on someone's opinion if they've actually done it ;)
 
woodster

woodster

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Sep 15, 2009
6,243
S2 9.2a Fairhope Al
i have rebuilt 5 and if they are not worn bad on the cover plate and the hump you can do this and trust them to work great it does not hurt to have a spare in the stash ready just in case just leave the impeller out till you need to change out the pump
 
malyea

malyea

.
Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
woodster said:
i have rebuilt 5 and if they are not worn bad on the cover plate and the hump you can do this and trust them to work great it does not hurt to have a spare in the stash ready just in case just leave the impeller out till you need to change out the pump
Click to expand
Armie also thinks I should rebuild it.......so he can learn from my mistakes ;)
 
Charles Erwin

Charles Erwin

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Jan 30, 2012
1,139
Nor'Sea 27 "Kiwanda" Portland/ Anacortes
These pumps are built by Johnson for Yanmar. They are very simple. The bearings (there are two) and the shaft lip seal (one) are completely standard at any bearing supply house. Installation of these new parts is simple as well.

I have not been able to find the shaft seal with stainless or bronze garter spring. So I put RTV into the spring slot so the spring is sealed from seawater.

If the shaft is scored it is unlikely you will have any success by polishing the shaft. In that case a new shaft is about $65 Yanmar.

I don't see anything in the factory kit you can't get or make. I think the total of the parts and a hand made cover gasket are worth about $25 - apart from the shaft.

Charles
 
Johnb

Johnb

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Jan 22, 2008
1,455
Hunter 37-cutter Richmond CA
My raw water pump got rebuilt by a mechanic 15 years ago and has been problem free for over a 1000 hours.
 
kito

kito

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Sep 13, 2012
2,011
1979 Hunter Cherubini 30 Clemmons
I rebuilt the water pump on my ysm12. I believe a new Yanmar water pump was about $330. Impeller, seals, gaskets etc was a lot cheaper. If you can operate a wrench and a screwdriver then it's a no brainer. Just be easy with the impeller plate screws. They are soft and the slots will round out fast. I actually used a small vise grip on mine so not to even mess with them.
 
B

Benny17441

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May 24, 2004
7,158
CC 30 South Florida
Once you disassemble the pump one time it will be real easy to do it again. With this in mind I would not be too pressed to rebuild the whole thing and would just consider replacing those parts that have or may be close to failing. So far you are looking at a gasket and perhaps a seal. Where is the leak at front or at the impeller cover? Is there any play in the shaft or are the bearings getting noisy? If yes or no that may give you an early indication of what you may expect to find and the scope of the job.
 
Nereussailor

Nereussailor

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Mar 22, 2004
733
Hunter 30 Vero Beach
I just rebuilt mine on my 2gm about a month or two ago. Real simple to do. Mine was leaking at the shaft seal and it was time for a new impeller. The hardest part was getting the old shaft seal out. A brass drift worked for that. Besides gaskets, the impeller and the shaft seals That's all I needed to replace. It's been working great every since. I replaced the impeller about 7 years ago and expected it to be trashed. I was surprised by how good of shape it was in and kept it for a spare.
 
Charles Erwin

Charles Erwin

.
Jan 30, 2012
1,139
Nor'Sea 27 "Kiwanda" Portland/ Anacortes
For what it is worth the (my) shop rule is renew the whole works.

After all one cannot replace the shaft seal unless one removes the shaft. And one cannot remove the shaft without removing the bearings along with it.

Those who do not follow this rule get to do it all over again when the old bearings quit on you. And they will quit - probably at the most inconvenient moment.

So please consider doing the whole job.

Charles
 
woodster

woodster

.
Sep 15, 2009
6,243
S2 9.2a Fairhope Al
Charles Erwin said:
For what it is worth the (my) shop rule is renew the whole works.

After all one cannot replace the shaft seal unless one removes the shaft. And one cannot remove the shaft without removing the bearings along with it.

Those who do not follow this rule get to do it all over again when the old bearings quit on you. And they will quit - probably at the most inconvenient moment.

So please consider doing the whole job.

Charles
Click to expand
+1
 
seadaddler

seadaddler

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Dec 19, 2006
5,813
Hunter 36 Punta Gorda
Rebuild/Ken 13559

I rebuilt my sea water pump a few years ago and with the help of Ken 13559
and after checking to make sure the leak is not from the pump cover.
I got all the parts from Yanmar dealer even though the seal was the problem
I decided to replace all the seals and bearing's.
I need to look for the photo of the exploded view of the pump and how to take apart the pump and press off the bearing's all with a vise and properly sized
sockets is how I did it.
My pump was for my 3YM30 but I think same as the pump for Yanmar 2GM & 3GM.
Nick
 
kloudie1

kloudie1

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Nov 6, 2006
10,047
Hunter 34 Mandeville Louisiana
That pump uses two, 6200 two seal bearings and a 10257 oil seal; commonly available stuff. If you are lucky, the shaft won't be too worn where the seal contacts .. if so, a new shaft will be needed.. the seal is only $8 from the Yanmar guys (#104211-42100)
Seals are designated by ID, OD, and thickness, so the seal ID is 10 mm, the OD is 25mm, and it is 7mm thick. If ya get the parts and take it to a good machine shop, they'll rebuild it for not too much money.
 
woodster

woodster

.
Sep 15, 2009
6,243
S2 9.2a Fairhope Al
new shaft

Category:Engine Parts & Accessories > Yanmar Engines and Parts
Manufacturer: Yanmar
Part Number: 124070-42061
Description:
Pump Shaft
Part #124070-42061 from Yanmar

Our price: $64.05 - each
 
B

Benny17441

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May 24, 2004
7,158
CC 30 South Florida
Charles Erwin said:
For what it is worth the (my) shop rule is renew the whole works.

After all one cannot replace the shaft seal unless one removes the shaft. And one cannot remove the shaft without removing the bearings along with it.

Those who do not follow this rule get to do it all over again when the old bearings quit on you. And they will quit - probably at the most inconvenient moment.

So please consider doing the whole job.

Charles
Click to expand
I stand corrected, it is not the complexity of the job but the unfortunate timing that a pump component might choose to fail that may support a complete rebuild. If the seal has failed there is bound to be excessive shaft play due to worn bearings. Do replace those and the spacer.
 
Nereussailor

Nereussailor

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Mar 22, 2004
733
Hunter 30 Vero Beach
Mine started leaking after hooking a hose up to the intake to test a rebuild while in a cradle. if I turned the hose on just a little, it would suck it flat. If I turned it on slightly more, it would leak out of the seal. No winning there so I rebuilt the pump too.
 
malyea

malyea

.
Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
Just ordered the rebuild kit from W.W. Williams in Savannah. Yanmar part number
K28270-42000.....we'll see how it goes.
 
malyea

malyea

.
Dec 15, 2009
236
'87 Irwin 43 Sea Breeze
Got the kit, disassembled the pump...almost...I need to figure a good way to press off the two shaft bearings and then press on the two new shaft bearings.
 
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