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Old 27-03-2018, 08:35   #1
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Yanmar 2GM20F raw water pump

Does anyone have the Johnson pump crossover number for a Yanmar 721575-42702 water pump">raw water pump? I'm looking for the major repair kit and possibly a new spare pump also. I know that it will be a lot cheaper than a Yanmar OEM one. They want around $550 for a new pump!
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Old 27-03-2018, 08:41   #2
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Re: Yanmar 2GM20F raw water pump

Call Depco Pump

Depco Pump Company

page 125 of the marine catalog

http://online.anyflip.com/ucrc/jfuq/...dex.html#p=126
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Old 27-03-2018, 09:47   #3
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Re: Yanmar 2GM20F raw water pump

Thanks DotDun! But I think these are all the Yanmar part numbers? I'm looking for the Johnson replacement part numbers.
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Old 27-03-2018, 10:07   #4
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Re: Yanmar 2GM20F raw water pump

Is there a number on the cover plate? Like F4B-9xx ??
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Old 27-03-2018, 10:52   #5
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Re: Yanmar 2GM20F raw water pump

No, I wish! that would point me right to it probably.
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Old 27-03-2018, 11:17   #6
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Re: Yanmar 2GM20F raw water pump

is this OpenCPN forum ?
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Old 27-03-2018, 12:59   #7
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Re: Yanmar 2GM20F raw water pump

Gyro, I have no clue? I just need help with this matter and I think ideally I would like this posted in "The Daily Cruiser" that's emailed to all the Members every day. But I don't know how to get into that forum?
Usually that Forum generates lots of discussion and help on matters!
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Old 27-03-2018, 13:12   #8
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Re: Yanmar 2GM20F raw water pump

Click on the Exclamation triangle down left to ask a moderator to move the thread to the correct sub-forum....

Your are not the first and there will be more for sure.
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Old 27-03-2018, 14:45   #9
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Re: Yanmar 2GM20F raw water pump

bcn- thanks thats great! But how do I show them or reference the thread to them? Should I cut and try to paste the whole thing?
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Old 27-03-2018, 14:54   #10
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Re: Yanmar 2GM20F raw water pump

Just clicking on the red triangle references the thread and post.
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Old 27-03-2018, 15:15   #11
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Re: Yanmar 2GM20F raw water pump

Great, thanks will do!
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Old 27-03-2018, 18:38   #12
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Re: Yanmar 2GM20F raw water pump

I keep seeing F4B903. You might call these people to verify.

Yanmar 128397-42500 Engine Cooling Pump Bronze

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Old 27-03-2018, 19:27   #13
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Re: Yanmar 2GM20F raw water pump

Thanks jimbunyard! I've sent them an email to see if thats the right one.
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Old 27-03-2018, 21:45   #14
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Re: Yanmar 2GM20F raw water pump

^^ FWIW, Yanmar uses different water pumps depending on the country of manufacture of the engine, date of manufacture and also the country of sale.

For instance, my current 2GM20 which has serial number beginning with "E" used a different RW pump than my previous 2GM20 that didn't have an "E" serial number. The E stands for Europe and my previous engine was built in Japan.

Even Yanmar dealers get this wrong occasionally. I have ordered parts for the RW pump complete with engine model and serial numbers and received the wrong parts.
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Old 27-03-2018, 21:50   #15
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Re: Yanmar 2GM20F raw water pump

Also FWIW, I find buying the lip seal and and bearings from the local bearing shop is way easier and pretty cheap. Just got 2 bearings and a lip seal for another Yanmar RW pump this week for $6 each for the bearing and $3 for the seal. Impellers can be sourced from most decent boat shops.

Of course you got to know the size you need or take the old ones with you
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