Just acquired a beast, it is a 398 serial # is 66B 6498. The arrangement # is almost unreadable but what I can make out is 9 11 7?
Who out there can tell me the year it was made? Only thing I was told is, it is about 900 HP.
It is air start and came with the air compressor and tanks and radiator. Also has a small generator that is belt driven off the front of the crankshaft. It is a hefty thing and will need to get some #s off it to see how big it is. This unit has a hydraulic clutch that runs a 25 groove pulley that I am not aware of what is was driving.

Hi, 1951D2.
LURVE yer new paperweight. Here is some more information on it.

mship.no/engines-equipment/207-caterpillar-d398.html

inventory.powerzone.com/invimages/58246/...8_D399_SpecSheet.pdf

Have fun.

Just my 0.02.

From the cat handbook no 10
D398 JWAC Jacket water aftercooled Max Hp 1170 at 1300 RPM Intermittent 975 at 1300 continuous 750 at 1200 rpm weight 12,445 lbs
D398 SCAC separate circuit aftercooled Max Hp 1275 at 1300, Intermittent 1075 at 1300 , continuous 850 at 1200 rpm weight 12,555 lbs both 2945 cu in.

a real beast for sure!!

Like three D339 D7E engines in one block.

Heres a sweet pump for the basement, yea I know, a little overkill.

Thanks for your reply's guys, This will be my biggest engine that I will have and I just could not let it be scrapped. Still trying to get the history nail down so I will know more of its history.



This it showing up on the truck.


obviously the radiator



Starting to get it unloaded.

I should of mentioned that the pulley on the rear end of this beast is a 25 groove v- belt.

One of the younger techs was over in Kodiak and had to do a valve adj on one in a boat was complaining on having to work on somthing So old....
I was suppose to do A inframeon on one in Petersburg this summer but the town wet full hydro and I guess decide to not use it

Fine old engine.....

Still curious if any one knows what year it is?

"1951D2" wrote:

Still curious if any one knows what year it is?

What a cool unit. Will we be seeing it at Rollag soon?

That is where it will show up and live. Lots of work to be done before that. I am now looking for a gravity box or anhydrous undercarriage to put under neath it.