replaceiing cumming in 4788-gctid382280

[Guest]

I have a bad port engine in my 4788, 370 HP Cumming. :sorrow: Had Cumming Mid-South on the boat and they recommend replacing with a rebuild. By mesuring it looks like it will go though the cabin door. Looking for source for engine and any advice on pulling engine.

Thanks

Larry Boater

[Guest]

Larry, one of the members here, ksanders, just completed a refit on a 4788, including engine replacement. He's probably the best source of current info....

What is the problem wht the engine? Can you do an in-frame rebuild?

[The_Other_Gary]

Call tony Athens at Seaboard Marine in SF, he will have them on the floor and he ships anywhere.

at the very least his quote will keep others honest.

[ksanders]

The port engine can come right up and out the door.

My best recommendation is to hire the most professional full service outfit you can to do the job. The firm you hire should have a track record of vessel repower work. I would not hire a one man shop, or the low bidder for this kind of work. Hire the best in your area. They should of course be a Cummins authorized dealer.

The question you have to ask is why did your engine go out in the first place.

Find the root cause of the engine failure and fix it. That way you will not have to go through this again.

Expect to pay between $25 and 30K for the complete job. The engine cost will be around $16K for the Cummins Reman package, and $21K for the repower package per engine.

The difference is that the reman package does not come with the relays, alternator, or starter. If you go with the reman, have these rebuilt and or replaced.

[Guest]

I purchased the boat used and this motor would not pull full RPM s. I had Cummins out and they determined that the throttle was not opening all the way. Adjusted and it was ok. I pulled the boat next spring and had the props redone. There was the problem. The prop on the bad engine was 24.5 pitch and the other was 22.5. So the port engine was over working. Not sure how many hours the previous owner had with the wrong pitch prop. Set both props at 24. It ran fine for 2 years. This spring running the boat the port engine stated blowing smoke and overheating. After shut down found that oil is coming out the dip stick and the turbo. Had the oil analyzed and has heavy aluminum. Most likly from piston wear.

Thanks for the information.

Larry Boater

[boatworkfl]

Pau Hana wrote:
Larry, one of the members here, ksanders, just completed a refit on a 4788, including engine replacement. He's probably the best source of current info....

What is the problem wht the engine? Can you do an in-frame rebuild?

If he has a 6BT series engine it will need to be bored.

[ksanders]

Larry Boater wrote:
I purchased the boat used and this motor would not pull full RPM s. I had Cummins out and they determined that the throttle was not opening all the way. Adjusted and it was ok. I pulled the boat next spring and had the props redone. There was the problem. The prop on the bad engine was 24.5 pitch and the other was 22.5. So the port engine was over working. Not sure how many hours the previous owner had with the wrong pitch prop. Set both props at 24. It ran fine for 2 years. This spring running the boat the port engine stated blowing smoke and overheating. After shut down found that oil is coming out the dip stick and the turbo. Had the oil analyzed and has heavy aluminum. Most likly from piston wear.

Thanks for the information.

Larry Boater

OK, the stock props were 24 pitch. From the factory, with normal loadout, your boat is overpropped.

I would highly recommend you drop 2" off of your prop pitch.