2GM Seawater Pump - Rebuild or Replace ?

[bill good]

1gm & 2gm were different size pumps & not the same (I believe made for yanmar.)

[Tropic Cat]

Originally Posted by bill good

1gm & 2gm were different size pumps & not the same (I believe made for yanmar.)

Really? According to my Yanmar engine manual. They are the same.

[lockie]

My manual shows the 1GM pump being driven off the oil pump shaft, whereas the 2GM pump is belt driven. Very different animals.

[bill good]

My service manual shows how easy it is to unbolt the pump from the 1GM . Can't work out why it takes me so long to do the same!!

[GordMay]

Both the 1GM & 2GM use the #128270-42000 Sea Water Pump Assembly, but (curiously) list different impeller numbers.
1GM ➥ http://www.yanmar.com.au/qrg/1gm.pdf
2GM ➥ http://www.yanmar.com.au/qrg/2gm.pdf

[bill good]

not so 128170-42200 for 1GM & 128270-42000 for 2GM. They appear to be different. I only have experience with the 1GMs

[GordMay]

Right you are Bill, and wrong I am (again).

[lockie]

Well, happy ending. Purchased the bits from Marinepro for a small fraction (literally) of the price the pirates here in Oz charge, and reco'd the pump myself. A new pump here costs about A$700!!!!!! No wonder we've got chips on our shoulders!

I wrote down the manufacturer and model number of the bearings and seal, so if I need to rec o it again, I can go to the local bearing shop and pay pennies for something Yanmar inflate many times over.

Cheers, lockie

[Tropic Cat]

Originally Posted by lockie

Well, happy ending. Purchased the bits from Marinepro for a small fraction (literally) of the price the pirates here in Oz charge, and reco'd the pump myself. ...

Marinepro is a good outfit. I just bought a set of Yanmar engine mounts and engine bits and pieces for much less than others were asking.

[lockie]

Yes Tropicat, I'll second that. Bill Adams was very helpful.

Cheers from Melbourne (Oz)

lockie

[Tellie]

Originally Posted by lockie

Well, happy ending. Purchased the bits from Marinepro for a small fraction (literally) of the price the pirates here in Oz charge, and reco'd the pump myself. A new pump here costs about A$700!!!!!! No wonder we've got chips on our shoulders!

I wrote down the manufacturer and model number of the bearings and seal, so if I need to rec o it again, I can go to the local bearing shop and pay pennies for something Yanmar inflate many times over.

Cheers, lockie

Ya wouldn't want to share the bearings and seal numbers with us would ya?

[lockie]

Bearings: NSK 6200ZZCM NS7S 605
Seal: NOK AEO279A

There you go. You obviously would also need a new gasket and impeller, and maybe a cover plate if both sides are heavily scored, but all the other metal bits you can clean up and reuse. So if the shaft isn't beyond cleaning up with some emery cloth, the rebuild should be pretty cheap.

We should start a people's revolution by posting all such generic spares!

Cheers, lockie

[shakey doug]

Lockie,
When using industrial seals you need to replace the inner contraction ring with an O ring as the standard steel ring lasts no time at all in a salt water enviroment.Would not reccommend emery cloth way to harsh, use 1200+ wet&dry.

cheers, Shakey.

[lockie]

Well Shakey you were right (but the seal did last 3 1/2 years before it chewed out).

Off to buy some 1200 W&D..........