Looking for help with Cummins 6CTA (8.3 liter medium duty diesel)

Equipment & Gear > Power Equipment & RV

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Skillet:
Update-

Our working theory is that someone swapped the flywheel out after it was test run somewhere along the way, but before it shipped to us... There is no starter available for this bellhousing/flywheel/ring gear combo. I have to give Cummins NW props on their response, however. They are airfreighting the correct starter/flywheel combo, and they are sending two techs (all on their dime) to help get this done tomorrow.

Boat is in the water now getting the electric drive stuff commissioned. As soon a they're done, we tear it apart again...

Lots of valuable lessons learned on this project.

pd:
Watching from the sidelines here. I must say that Cummins NW impresses me with their response.

EnglishSetter:
Sounds like you have a direction.

The only Cummins guru I know is Tony Athens at Seaboard Marine in SoCal.

www.sbmar.com.

Having pulled a 72C off a 6BT in the bilge of my 26 Shamrock, yeh, not fun.

What are you using for a flex plate? I didn't want to ever do this job again, so went with a Suredrive hub.

https://www.suredrivemarine.com/suredrive

Skillet:
They're using something similar to the suredrive, not sure if the brand. It came from Italy. That setup is pretty standard up here when you get into the 200+ hp continuous duty ratings.

As an aside, I put a suredrive in my own boat when Iput in a new gearbox for exactly the same reason you describe. Original setup was a damper plate, springs were broken. Had to have the folks at Suredrive custom build my hub center to match my oddball engine and gear combo (definitely not an of the shelf part). Expensive, but worth it.

EnglishSetter:

--- Quote from: Skillet on February 04, 2026, 10:22:33 AM ---They're using something similar to the suredrive, not sure if the brand. It came from Italy. That setup is pretty standard up here when you get into the 200+ hp continuous duty ratings.

As an aside, I put a suredrive in my own boat when Iput in a new gearbox for exactly the same reason you describe. Original setup was a damper plate, springs were broken. Had to have the folks at Suredrive custom build my hub center to match my oddball engine and gear combo (definitely not an of the shelf part). Expensive, but worth it.

--- End quote ---

Mine was 6BT to a Velvet drive 72C, so standard hub. Friends called it the flux capacitor damper.

Damper cam apart getting the splines out.

I'm curious on the hybrid set-up. I've seen "get-home" set ups using a (petrol) pony motor driving a belt driven sheave on the driveshaft. Wouldn't work for me as I have very little exposed shaft, but........

I know diesel electric is commonplace in ships and trains, but that's largely to let engines run where they're most efficient and let the electrics buffer the ups and downs. So I'm not sure where this technology is supposed to (as in the article) cut fuel costs by 50-60%

Now a nice Mr. Fusion on the other hand. ;)

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