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08-11-2020, 09:29 AM
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#1
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Guru
City: Port Townsend Washington
Vessel Name: " OTTER "
Vessel Model: Ocean Alexander Europa 40
Join Date: Nov 2009
Posts: 2,378
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Onan MDJE7.5 Raw water pump
The salt water pump on my trusty old 7.5kw onan genset is slowly giving up the ghost, these pumps are notoriously expensive to repair or replace. The unit is a slot driven direct bolt on unit and very rare. Others have written about replacing the unit with a March (or other) electric pump. Looking for any new or additional info anybody has regarding this..
Thanks
HOLLYWOOD
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08-11-2020, 09:38 AM
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#2
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Senior Member
City: Colonial Beach, VA
Vessel Name: Tatoosh
Vessel Model: 1979 49ft Marine Trader RPH
Join Date: Jun 2019
Posts: 365
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That is what I am planning on doing. I bought a small March pump, but have not yet installed it. My WP is still good though, so no hurry. I may have a spare of two for you. I will look if your interested.
-Rich
__________________
"Everything on your boat is broken.... You just don't know it yet."
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08-11-2020, 04:03 PM
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#3
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Guru
City: Port Townsend Washington
Vessel Name: " OTTER "
Vessel Model: Ocean Alexander Europa 40
Join Date: Nov 2009
Posts: 2,378
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Quote:
Originally Posted by Redhook98
That is what I am planning on doing. I bought a small March pump, but have not yet installed it. My WP is still good though, so no hurry. I may have a spare of two for you. I will look if your interested.
-Rich
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Thanks for the offer, I am currently considering buying a decent copy of the entire genset we currently have as a spare parts donor, the electric pump option seems to check a few of the boxes to lessen maintenance and keep the noisemaker in the boat for the future.
HOLLYWOOD
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08-11-2020, 04:21 PM
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#4
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Guru
City: North Carolina for now
Join Date: Aug 2011
Posts: 6,348
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Call Depco and discuss your options. They have all the parts, or the whole pump, or can rebuild it for you, and discuss alternatives. The pump authorities.
http://online.anyflip.com/ucrc/jfuq/...dex.html#p=134
__________________
George
"There's the Right Way, the Wrong Way, and what some guy says he's gotten away with"
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08-11-2020, 05:04 PM
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#5
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Guru
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 4,984
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Can you get too little flow rate and overheat? I am supposing with a position displacement engine it would be hard to get too much. You could screw up and not have the pump shut down along with the generator and flood it. These issues bugged me; so I chose to leave my MDJE fully stock except for the miserable little POS heat exchanger which I junked in favor of a much bigger copper/nickel unit which I mounted off the genny.
__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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08-13-2020, 03:03 PM
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#6
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Guru
City: Southern Maine
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 2,717
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I use a March pump in place of the belt-driven pump on my 7.5 MDJE. It's worked great for several years now. It's wired directly to the generator output, so no way it can run without the motor running. It cools fine, the flow seems at least as good as, if not better than, the old pump.
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08-13-2020, 04:22 PM
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#7
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Senior Member
City: Chesapeake Bay
Vessel Name: Patty Ann
Vessel Model: Mainship 34 MK1 1980
Join Date: Jan 2014
Posts: 410
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I replaced our failed pump with a March pump on a MDJA 3.5KW and wired it to the output ,no chance of flooding the engine. The pump works better than the original with no problems.
__________________
David
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08-13-2020, 11:31 PM
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#8
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Senior Member
City: La Conner
Join Date: Jan 2013
Posts: 120
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I switched to a electric and ran for 4 years. It was wonderful. I am trying to pm you the instructions which were given to me by another member edelweiss
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08-14-2020, 12:06 AM
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#9
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Guru
City: Port Townsend Washington
Vessel Name: " OTTER "
Vessel Model: Ocean Alexander Europa 40
Join Date: Nov 2009
Posts: 2,378
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Quote:
Originally Posted by Bigsalmonfish
I switched to a electric and ran for 4 years. It was wonderful. I am trying to pm you the instructions which were given to me by another member edelweiss
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I got the info, Thanks again
HOLLYWOOD
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