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Old 06-07-2013, 07:50 PM   #21
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Your concerns along with their shortened lifespan due to over propping was the main reason I bought a boat that was a repower candidate.

That way I know the engines history and am less likely to receive a visit from mr big bill
Yessir!!! Over propping is also their enemy...and the enemy of any high strung recreational marine diesel. Under prop them a little and they will last forever.

The boat/engines I bought have only 350 hours on them. "Marine age" is always a concern but not much damage can be done from over propping in that period of time. Also, the engine survey showed no symptoms of damage due to these concerns. I will be getting new props and be basically shooting in the dark on the pitch. It left the factory with 23x28 and Timjet said his boat was over propped at 23x27. So I am gonna go with 24 pitch. He is gonna go with 22. His boat is VERY similar to mine(Carver 355) with the same engines. I think we will be in the ballpark. My boat goes in the yard on Monday!...new props...shafts...and rudders.
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Old 06-07-2013, 08:05 PM   #22
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Yessir!!! Over propping is also their enemy...and the enemy of any high strung recreational marine diesel. Under prop them a little and they will last forever.

The boat/engines I bought have only 350 hours on them. "Marine age" is always a concern but not much damage can be done from over propping in that period of time. Also, the engine survey showed no symptoms of damage due to these concerns. I will be getting new props and be basically shooting in the dark on the pitch. It left the factory with 23x28 and Timjet said his boat was over propped at 23x27. So I am gonna go with 24 pitch. He is gonna go with 22. His boat is VERY similar to mine(Carver 355) with the same engines. I think we will be in the ballpark. My boat goes in the yard on Monday!...new props...shafts...and rudders.
Under propping is a great idea.

When I repowered our boat we went from a 24x24 to a 24x22.

This spring I tried a wot test after a year and a half of time on them and the bottom paint. Was able to reach 2960 rpm with egt of slightly under 900
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Old 06-07-2013, 08:13 PM   #23
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Perfect...assuming it is a 2800rpm motor. How heavy is your boat???
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Old 06-07-2013, 09:03 PM   #24
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Perfect...assuming it is a 2800rpm motor. How heavy is your boat???
The factory says 30k empty I think

I tested it full fuel full water, skiff, all my junk

Probably 37k or so but that's a guess

The engines are 330 cummins
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Old 06-07-2013, 11:10 PM   #25
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The engines are 330 cummins
I had the Cummins dealer over to my boat today to service the complete raw water system and change the impeller. The tech was an ex Navy guy (7 years) who worked on diesels in the service. I ask him for his honest opinion of the 330B engines and he said "they are the best engines Cummins ever built."
He also said that the Navy is full of them...admirals barges, captains gigs, etc.
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Old 06-08-2013, 12:10 AM   #26
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I had the Cummins dealer over to my boat today to service the complete raw water system and change the impeller. The tech was an ex Navy guy (7 years) who worked on diesels in the service. I ask him for his honest opinion of the 330B engines and he said "they are the best engines Cummins ever built."
He also said that the navy is full of them...admirals barges, captains gigs, etc.

Cool!

Thanks!
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Old 06-08-2013, 03:31 AM   #27
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I had the Cummins dealer over to my boat today to service the complete raw water system and change the impeller. The tech was an ex Navy guy (7 years) who worked on diesels in the service. I ask him for his honest opinion of the 330B engines and he said "they are the best engines Cummins ever built."
He also said that the Navy is full of them...admirals barges, captains gigs, etc.
Any word on the after cooler???
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Old 06-08-2013, 09:50 AM   #28
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Changed out the impellers on my Cummins BT5.9M yesterday. Anybody think I waited a little too long. The 2nd picture is the debris, pump vanes I took out of the port tranny cooler inlet.
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Old 06-08-2013, 10:17 AM   #29
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Any word on the after cooler???
I forgot to mention that the after cooler was fine.

The impeller interested me as the old one was very stiff when flexing the vanes while the new one's vanes flexed easily. Because of this difference in flexibility, it would follow that the new impeller will not see the forces the old one did and may not pump as efficiently. Has anyone else noticed this difference or does an impeller "work harden" during its life?
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Old 06-08-2013, 10:32 AM   #30
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Mine seem stiffer after 2 years of service than the new ones that replace them which are pliable.
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Old 06-08-2013, 11:00 AM   #31
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I forgot to mention that the after cooler was fine.
Awesome news!!!!
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Old 06-08-2013, 10:35 PM   #32
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I've cleaned my aftercoolers twice in the 3 years I've owned the boat. I can do it fairly quickly now that I've learned a few tricks.
I don't know why the Cummins aftercoolers seem to justify more discussion than others. I would think the same issues would be common to all marine aftercoolers. The Cummins aftercoolers core is brass and the housing aluminum. The brass and aluminum do come in contact and are always in salt water. However my experience is I've had no problems with my coolers and when I cleaned them the second time they really didn't need it. I do however fresh water flush my engines so I think that may be why.
I've heard Cummins does have a kit to change the aftercoolers from raw water to coolant. However that does not help the other items in the raw water cooling system; heat exchanger, oil cooler and fuel cooler. A fresh water flush system will help protect all the raw water components from "marine age" and is far easier & cheaper to install.
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Old 06-09-2013, 03:29 AM   #33
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Hi. Iīve installed a waterfilter after the impellerpump on my two last boats = two filters and peace of (my) mind.
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