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Old 11-01-2018, 06:34   #1
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Lombaradini LMG4000 water pump

Total shot in the dark, but does anyone have/know who really makes the seawater pump on a LMG4000 generator so that maybe I can find shaft seals for it. Been trying to get from dealers for days plus I can't accept that a flexible belt driven water pump on a $6k generator can possibly be $1k.
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Old 11-01-2018, 06:42   #2
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Re: Lombaradini LMG4000 water pump

Can you post a photo of the pump?
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Old 15-01-2018, 11:15   #3
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Re: Lombaradini LMG4000 water pump

Well when I get back ti the boat I’m going to be taking that pump out and if I can not identify it I’m going to find a replacement make. The thing I’m NOT going to do is pay over $1000 for an OEM pump on a generator that cost me $5600 less than 2 years ago!
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Old 15-01-2018, 12:16   #4
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Lombaradini LMG4000 water pump

This seems to be the best photo I could find, if itís the right one.Click image for larger version

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Old 17-01-2018, 15:54   #5
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Re: Lombaradini LMG4000 water pump

My Lombardini LDW1404M (marine engine, not generator) has a Swedish Johnson water pump">Raw water pump, as do many of these small diesels. Very likely yours is also a Johnson?

The seals on mine are standard oil lip seals, for both the water side and the oil side (my pump is engine driven).
Seal is GACO DPSM 122407 for a 12mm shaft (24 OD and 7 width). Cost is a few dollars.

I am very interested in the your photo showing a water filter, which might be common but new to me. I do have the usual strainer, but I have regular problems with grit scoring the shaft. A new shaft has damaged after 18months. I'm trying a narrower seal to move the wear spot of the lip seal itself. Any others suggestions?
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Old 17-01-2018, 16:04   #6
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Re: Lombaradini LMG4000 water pump

It took 2 weeks but I finally got part number and price $16 for the seals. But it also turns out that my pump is under warranty, so I’m waiting to see what they are going to do. If I get the seals I’ll definitely take measurements to find the real source.
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Old 17-01-2018, 16:13   #7
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Re: Lombaradini LMG4000 water pump

Usually there is a number on the seals, maybe starting with CR? Depending of course on who makes them.
I have had pretty good luck taking them to a Bearing and Drive store and they can usually take a caliper and give me a seal. Sometimes you can get a double lip seal that is otherwise identical. Iíve had better luck with double lip seals myself.
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Old 22-01-2018, 16:24   #8
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Re: Lombaradini LMG4000 water pump

It took weeks, but they are sending me a new pump under warranty. I’m still going to order some seals as they were only $16 as OEM
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Old 22-01-2018, 17:08   #9
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Re: Lombaradini LMG4000 water pump

Then you should be able to overhaul your old one, and have a spare?
Are they letting you keep the old one?
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