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Old 06-03-2019, 02:12 PM   #1
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Cummins 6BTA 5.9 45 Min Impeller swap

Call me a happy camper. A couple of years ago I had my Cummins raw water pump replaced with a Seaboard Marine pump. This was the first time I replaced the raw water pump Impeller. What a great pump/Impeller design. Take off the cover plate. Twist lock the Impeller puller and 4 minutes with a racket wrench the Impeller is out.
Just make sure the new Impeller goes in with the puller ďWingsĒ facing out. Click image for larger version

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Old 06-04-2019, 09:02 AM   #2
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Ditto here. Also, I removed the fuel cooler per Tony Athens. Made accessing the pump for impeller changes much easier.
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Old 06-04-2019, 08:11 PM   #3
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Cummins 6BTA 5.9 45 Min Impeller swap

Quote:
Originally Posted by dwhatty View Post
Ditto here. Also, I removed the fuel cooler per Tony Athens. Made accessing the pump for impeller changes much easier.


I was thinking about doing that. What area / water temperatures do you cruise in? Iím in Florida with 88 degree summer waters.
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Old 06-05-2019, 06:30 AM   #4
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I was thinking about doing that. What area / water temperatures do you cruise in? Iím in Florida with 88 degree summer waters.

Maine. But email or talk with Tony Athens. I got the impression that his position is that the cooler is not needed on a recreational boat that isn't running hard all day. But I may misremember.
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Old 06-05-2019, 07:57 AM   #5
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I just replaced the impeller on my SeaMax (Seaboard Marine) water pump yesterday... 30 minutes, and not rushing. I will also remove the fuel cooler with the Seaboard kit sometime this year.
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Old 09-15-2019, 06:21 PM   #6
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I removed my fuel cooler from my 6BTA 5.9 Cummins and used the Seaboard kit, 2 hrs start to finish clean up. Nordic Tug in SC.
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Old 09-15-2019, 06:35 PM   #7
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I removed my fuel cooler from my 6BTA 5.9 Cummins and used the Seaboard kit, 2 hrs start to finish clean up. Nordic Tug in SC.

I have seriously considered removing the fuel cooler as well. I generally have about 100-150 gallons of fuel in the tank that Iím using at any given time. My tanks are outboard of the ER on either side and the hull is sitting in 52 degree water. I also am running my QSB 5.9 at a pretty low load, usually about 1,450 rpm which is about 30% load I think.

So, I donít think I need to cool my fuel and I wouldnít mind eliminating another potential point of failure in the system. I have to say though, I really hate dealing with fuel lines so I have avoided it.
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Old 09-15-2019, 07:42 PM   #8
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Dave,
I removed my fuel cooler this spring. I did not use the SB Marine kit, just removed the cooler and replaced one hose (at a local hose suppler). Therefore, I did not remove the fuel combo block. My first impeller change (in the Seamax pump) will be done this spring. Hopefully it will be easy!
The job was very straightforward, and I did not notice any negatives during this summer's cruising (about 200 hours). We cruise mostly at about 1/2 throttle.

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Old 09-15-2019, 08:16 PM   #9
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Dave,
I removed my fuel cooler this spring. I did not use the SB Marine kit, just removed the cooler and replaced one hose (at a local hose suppler). Therefore, I did not remove the fuel combo block. My first impeller change (in the Seamax pump) will be done this spring. Hopefully it will be easy!
The job was very straightforward, and I did not notice any negatives during this summer's cruising (about 200 hours). We cruise mostly at about 1/2 throttle.

Regards,
Tom


Thank Tom. Iíll look at that.

The first time I changed the impeller in my 5.9 I couldnít do it. I had a mechanic down on the boat to remove and service the aftercooler. I put my ego aside and asked him to do it. He couldnít either. I had removed the impeller without too much trouble but we couldnít put the new one in.

Hours later, we gave up. On a hunch, I pulled out another spare impeller that I had on board. The splines looks slightly different. This one slipped right in. The bad impeller was on the boat when i bought it, new it its package. The molded part number was correct. It just didnít fit.
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