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Yes - it's crucial that you acquire parts books for any engines you want to swap parts between .. so you can compare parts and design changes. Some engineering changes are very subtle, and can cause you grief, if improperly mixed.
Thanks, Oz and Kelly for the run down on the D8 13000. Some points to be aware of when swapping engine parts!
Yes, there were some substantial engineering upgrades to the 13A engines, based on rapidly improving technology, related to steels, and alloys, in the early 1950's.
So to recap, increases in HP before the 13A were accomplished by upping the RPM, using a stronger spring or lighter weights, different injector pump cam and letting the rack open up more.
With the 13A a change to valve timing and beefier pistons on top of these tweaks?
Accompanying the increases were the change to precision bearings, improvements in crankshaft and piston design and metallurgy, oil delivery/cooling as well as the screw-in injector heads. There were defenitely some key turning point changes!
Yes they were, as I understand it, the pusher was build from 13A1 through 13A234 and equipped with the 3H1906 Transmission Group. The newer standard D8 Tractors retained the same 13A series of serial numbers as the former D8 Pusher Tractor. For pusher applications a pusher arrangement 3H5676 was offered. This was the new standard D8 Tractor equipped with heavy duty track roller guards, and the 2000 pound counterweight, a 3H1906 Transmission Group and crankcase guard. The later D8 Tractors came with the larger fuel Tank more commonly know as the “Bubble Tank” which became effective with machine SN 13A959. (Caterpillar Service Magazine, June 11, 1954)
Kelly - I'm a little short on Service Magazines, Service Reporters and general new model releases in the 1953-1954 period.
Was the 13A available in a "Standard D8" form, as well as the "Pusher D8"? If so, what were the differences?
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