Cummins 370 on Craigslist

Rick · Post by **Rick** » Mon Jul 12, 2010 11:50 am

There's 2 very interesting deals on Craigslist. 1. A Cummins 370 for $16.9K 2. A pair of 370's (no tranny's) for $8,800. Guess they both have failed aftercooler seals and water got into the borings. Does anyone know....is that a total rebuild ? Rick Ticket 85 SF Merc 454 MPI's Falmouth, MA

Post by **dougl33** » Mon Jul 12, 2010 1:11 pm

Frank Price could answer better than I can, but if the after-cooler was feeding the engine seawater its likely to need a total tear down.

Rick · Post by **Rick** » Mon Jul 12, 2010 1:24 pm

I thought so too. But that might be take apart - clean up and put back together. As opposed to buying a bunch of parts to get it going. This could be just a bunch of gaskets. Rick Ticket 85 SF Merc 454 MPI's Falmouth, MA

Post by **dougl33** » Mon Jul 12, 2010 4:05 pm

It will be a lot more than a bunch of gaskets.

franklyprice · Post by **franklyprice** » Mon Jul 12, 2010 4:14 pm

I would say that the pair of complete engines is a good deal. Even if they needed a complete rebuild, they wouldn't need any hard parts , like flywheels, etc. maybe not even exhaust manifolds. You wouldn't really know until you tear them down but since they run right now, I would bet the worst case would be an over bore, pistons, bearings , send the pumps out , probably new turbos. You could be into the pair for less than $20K. That's cheap for a fresh set of 370's

Rick · Post by **Rick** » Mon Jul 12, 2010 4:58 pm

Thanks Frank, definitely worth thinking about. I don't need them, so I could take my time and hopefully find some tranny's. Rick Ticket 85 SF Merc 454 MPI's Falmouth, MA

ckuppens · Post by **ckuppens** » Mon Jul 12, 2010 5:02 pm

Would it be worth having them surveyed or even bench tested by Cummins? I wonder if you could work something out with the seller to see what you would need to do to fix them. Maybe you spend a few bucks on the front end but if you are serious you will know exactly what you are getting into???

Rick · Post by **Rick** » Tue Jul 13, 2010 4:06 am

Good idea Chris but I think they'd have to open 'em up in order to see what was really going on. I can open them up....it's the getting back together that I'll struggle with ! Rick Ticket 85 SF Merc 454 MPI's Falmouth, MA

greysole · Post by **greysole** » Tue Jul 13, 2010 6:32 am

Rick Interesting, especially if you're not in a hurry, you can slowly work through it. Frank, What's your opinion on the 370s v the 330s that you put in. Did I read way back in one of your previous posts that if you were doing it over again you would go with the 370s?

franklyprice · Post by **franklyprice** » Tue Jul 13, 2010 3:31 pm

Gerard, I am a little perplexed about the Cummins 330 VS 370. The two are so similar that the only difference is pump settings and injectors yet it's OK to run the 370's at 2600 RPM cruise? It seems to me that if we run the 330 at 2600 RPM we would get the same performance and the same (reduced) engine life as the 370? The guys I know who have 370's are propped down to achieve more RPMa t cruise, so they have to run more RPM to get the same speed as the 330's. Just doesn't make sense to me. Now on the other hand, Yanmar , as in Brian Davin's boat, makes the power with more displacement than the smaller HP motors, so he seems to reap the benefits of having 370's. Now, all that said, after going 30Knots with my boat, if I was going to do it again I might look at a pair of Cummins C's at 450 HP and make it really fast. It would idle at 8 Knots or so but cruising at close to 30 when conditions permit would be unreal.

Sean B · Post by **Sean B** » Wed Jul 14, 2010 9:10 am

quote:if I was going to do it again I might look at a pair of Cummins C's at 450 HP Would they fit? Hell of an idea!

schultz · Post by **schultz** » Thu Jul 15, 2010 3:35 pm

Frank, Seamaster Marine is listing 450hp rebuilt 6CTA's for $13,500. Any idea of the physical diff and transmission requirements from the 6BTA?

franklyprice · Post by **franklyprice** » Thu Jul 15, 2010 4:35 pm

Cliff, I don't have any answers for that but the dimensions are easy to get from Cummins. I do think they are essentially the same dimensions as a Cat 3126 which is supposed to fit. I assume the next trans. size up from the ZF 220A?

Sean B · Post by **Sean B** » Thu Jul 15, 2010 10:45 pm

Not sure about the 33 FBC, but on the Sportfish model the overall length of the engine + gear has got to be a limiting factor. There are only so many inches of space between the shaft logs and the forward engine bulkhead. I think the 3126 (or C-series Cummings) is about the same size as the 3208, and (if I'm correct about that) with that size engine, there is no more room for any gear larger than the very small MG502-1. I think the size of the gear needed would make the assembly too big for the boat. Fun to think about though. Maybe on a FBC this length dimension is not a limitation (?)

Post by **dougl33** » Fri Jul 16, 2010 6:42 am

There's one FBC I know of running with 3126's. I think its Rich's boat (Catch 22). The guy who did my repower did the install.