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Old 18-04-2010, 04:15   #1
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2GM Seawater Pump - Rebuild or Replace ?

My pump is dripping pretty badly and obviously needs some TLC. Since it's such a small thing I'm wondering if it's worth rebuilding with new seals etc, or just best to replace it?

cheers, lockie
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Old 18-04-2010, 05:03   #2
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Though the kits are pricey for what they are, if your pump can be rebuilt it's going to be far less expensive than a new Yanmar replacement.
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Old 18-04-2010, 05:14   #3
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new ones are about $225
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Old 18-04-2010, 05:17   #4
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new ones are about $225
Kewl, where?
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Old 19-04-2010, 01:51   #5
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Yeah, tell us where please! The only prices I can find are multiples of that number (orders of magnitude in Oz)!

cheers, lockie
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Old 19-04-2010, 04:26   #6
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Bearing services for seals & bearings.
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Old 19-04-2010, 04:29   #7
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In the past I have found Minards to be quite reasonable with prices compared to the official Yanmar dealers. I don't have any recent experience with them. They will ship anywhere in the world.

Minards Diesel | Yanmar Engines & Parts Specialist
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Old 19-04-2010, 04:38   #8
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The issue with rebuilding these pumps isn't necessarily just getting new seals. It only takes a small amount of silt to work it's way between the shaft and the seal to wear a groove in the shaft. In which case you have to find a sleeve to fit around the shaft and still fit the new seal.

Two years ago I paid $155.00 USD for a new pump from a local Yanmar distributor.
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Old 19-04-2010, 06:49   #9
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The issue with rebuilding these pumps isn't necessarily just getting new seals. It only takes a small amount of silt to work it's way between the shaft and the seal to wear a groove in the shaft. In which case you have to find a sleeve to fit around the shaft and still fit the new seal.

Two years ago I paid $155.00 USD for a new pump from a local Yanmar distributor.

Wow that is cheap. I'm buying from the wrong guys. Please, where is your Yanmar distributor? Last time I was qouted between $400-$500 for a new Yanmar pump. The re-build kits were a little over $100.
If I could buy a new pump for $155 I'd buy two today.
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Old 19-04-2010, 08:43   #10
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The water pump on my Yanmar's 1GM10 and 2GM are the same part number in my recollection.

I bought from
Yanmar Distributor Marine Pro of Central Florida - Complete Re-power Service

I have no connection with this company other than being a satisfied customer..
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Old 19-04-2010, 18:27   #11
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I'm wondering how hard it would be to make a new shaft, using a $2 piece of 316SS bar and 30 minutes on my friend's lathe!
Anyone done this?

cheers, lockie
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Old 19-04-2010, 21:08   #12
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Can you lathe hardened steel?
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Old 19-04-2010, 21:27   #13
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No problem machining 316SS - it's harder than mild steel, but not all that much.

I was talking to the local Johnson pumps bloke who suggested using a duplex stainless (much harder and more corrosion-resistant than the standard 316 shafts). Now that might be a challenge to turn on a lathe with normal tool steel. Anywway, the old shaft has lasted many years until now, and the engine is not a pup by any means, so I reckon 316 would see it out.

By the way, Johnson have pumps which look surprisingly similar to the Yanmar one (guess who makes them for Yanmar!). The one in question is listed for less than $300 at pumpvendor.com, so I'll check it's dimensions and if it fits, I might go that way.
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Old 20-04-2010, 01:58   #14
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I had a vague re-collection that the 1GM & 2 GM seawater pumps were Jabsco pumps.

Anyone know more??????????
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Old 20-04-2010, 05:01   #15
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I had a vague re-collection that the 1GM & 2 GM seawater pumps were Jabsco pumps.

Anyone know more??????????
I believe I read this as well.
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