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Old 20-04-2010, 07:00   #16
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1gm & 2gm were different size pumps & not the same (I believe made for yanmar.)
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Old 20-04-2010, 08:09   #17
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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.
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Old 20-04-2010, 17:11   #18
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My manual shows the 1GM pump being driven off the oil pump shaft, whereas the 2GM pump is belt driven. Very different animals.
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Old 20-04-2010, 17:25   #19
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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!!
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Old 21-04-2010, 10:16   #20
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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
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Old 21-04-2010, 16:21   #21
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not so 128170-42200 for 1GM & 128270-42000 for 2GM. They appear to be different. I only have experience with the 1GMs
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Old 21-04-2010, 16:29   #22
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Right you are Bill, and wrong I am (again).
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Old 04-05-2010, 03:45   #23
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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
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Old 04-05-2010, 04:52   #24
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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.
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Old 04-05-2010, 06:43   #25
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Yes Tropicat, I'll second that. Bill Adams was very helpful.

Cheers from Melbourne (Oz)

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Old 04-05-2010, 08:16   #26
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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?
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Old 04-05-2010, 18:04   #27
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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
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Old 04-05-2010, 20:07   #28
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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.
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Old 24-09-2013, 01:44   #29
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Re: 2GM Seawater Pump - Rebuild or Replace ?

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..........
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