wilperson

Does anyone know much about marine Cummings 302? They are in a 1974 pacemaker yacht. I can't find much info about their dependability. If parts are still available.

Dieselbuilder

do you mean 509?

wilperson

I was told it was Cummings 302 but I can't find any info on that motor any where.

6cylinders

Post a pic,,,,I really want to see that " G "

wilperson

This what I was told is in this boat.
Twin 302 Cummins engines non aspirated diesel - 300hp @ 1800 rpm, fresh water cooled

I saw the motors but didn't really look at them that close, I was browsing at that point.

6cylinders

V-8's ? Big sized, like bigger than a 8-71 Detroit and way bigger than a 3208 CAT?
Probably 903 Cummins for that power at that rpm.

6cylinders

http://grabcad.com/library/cummins-vt-903-m-engine--7

wilperson

I just sent the seller a message, he told me several times 302 Cummings

6cylinders

http://nationaldieselengineinc.com/w...ins-Engine.jpg


or smaller, this is a 555 Cummins, often called - triple nickle

Dr.Dizzle

There is no "G" in Cummins.

6cylinders

I had a 903, it was rated @ 290 HP, it used a lot of fuel .

Maybe it's a inline 6 cyl.,
yes 555 and 903 parts are getting a little hard to come by,
although you can get lots of military surplus 903 stuff.

wilperson

I hope it's not the triple nickels in this boat, because I hear you can't find parts for that motor

wilperson

Well I hope it's a simple error, and they are not attempting to mislead me.

Hvytrkmech

Marine applications are usually rated in HP. Displacement is the real question I'm seeing here. The 555 or triple nickel was rated out to 300 hp. However, they are the best anchors made. Read junk into that. Dig into it further prior to pulling the trigger in any sale.

Best of luck.

wilperson

Thanks for the feed back I will definitely dig lol.

Here is a reply they just sent me, does it hold water?
These are back in the days when they used truck engines, commercial refrigerator diesels, tractor and farm equipment diesels and converted them to diesels for marine. They also used military engines like the Catapiller that were developed actually as a throwaway engine but turned out to be one of the most solid engines of all time . I can only give you a list of the modern engines and you can compare and see how they rate with this engine. I also use resources such as retired merchant marine mechanics and they give me the stats as well. That way I double checked my research and they are the best resources since they've done it for many many years. But it's more like they know the engines like the back of of your hand rather than looking into technical data that has not been recorded on the Internet.