As to truck use check for the 12 counter weight crankshaft that was used in the earlier truck engines. That crank was American made and some of the gen set engines (latter ones all got the 6 weight Japanese cranks). Seen an awful lot of the latter truck engines with the 6 weight cranks come back under warranty with busted crankshafts. Another difference between engines was the oil pans. Externally they may look the same but, internally they are baffled differently also they used cast iron and aluminum depending on use; get set, bulldozer, truck etc. And while on the subject of oil pans the one that's on your unit looks a bit odd in that it has what looks to be a pipe plug in the side up high by the front. Maybe another indicator that it's an earlier unit.

  Its been quite awhile since I looked at those things on a daily basis.  

dan

John(CO), Yes, it will be sharp looking painted Purple.

DougG, Yes, it is extremely heavy as a genset unit. I hired a semi-truck wrecker to boom it up onto my trailer. My AC706B forklift (6000 lb capacity) could lift up one end, pull it on it's skids, tilt it with it's forks, but would not lift it vertically. Serious weight!

Acdiesel, Yes, I'm very excited for this project to be going forward.

LeonR2013, I'll need to research the injectors further. I'm assuming much of it's fuel system is limited base on the genset's constant run application??

ACjack, Here are the photos you requested.

Prior to transport, I tried to research online the weight of the genset unit. There is not much info available for this older stuff. I did find some pdf of Onan/Allis 516 or 685 weighing around 5100 lbs dated 1979, and then Onan/Cummins 855 weighing 6100lbs dated in the 1980s. Anyway, I finally phoned Gateway Industrial (the company that initially sold it) and they could not put their hands on specs sheet because of it's age. Said they'd have to search archives. They told me the Onan generator is a 250KW level and to figure maybe 12,000 lbs. I think thats high cause my AC706B would probably not been able to lift one end much less drag it across the rock lot on its skids. 

The seller of the genset was impressed that my AC706B had a hydraulic safe limit so it would not lift something bigger than it could stabilize. Hats off to AC for doing a great job building safety into it's equipment. 

 

   Yes, and here's how we'd go about getting the crankshaft part number in the master catalog that I mentioned. 1st we'd look up  the catalog number for the engine (4390848); and on that page it would list the group numbers for all of the sub assemblies that make up the 4390848 engine assembly. We'd then take the group number for the crankshaft assembly and then go to that page and on that page you'd find a list for all of the parts that make up the crankshaft assembly "IE" part numbers for the bearings, any plugs, dowel pins, gears and the part number for the crankshaft. It wouldn't give you a description of the crankshaft. although at the time they were only using 2 kinds of crankshafts, the 12 counter weigh US made crank and the 6 counter weight Japanese crank. If my memory is correct the 6 weight crank went into the lower HP engines 16,000-21000 series and at some point  (later build) I believe the 25000 series gen sets also got the 6 weight cranks.

    The catalog and group numbers were all listed consecutively so it was possible to move several feet either right or left along that 8 foot "book" to find the info that you needed. Computers, who needs them 

   

What was this used to power when needed? A hospital?