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Somerville, Indiana | Whayne parts give the 46A manufactured in the same time frame as daveswia states. I have much more info from the D7 series, the D7E still had four of the D8Hs 6 cylinders. D7D 17A18692 has turbo, dry air cleaner, power steering, still dry brakes and turning clutches, oil master clutch, 5 spd forward 4 reverse with 5 th spd having no neutral or reverse capabilities, pony engine, hydraulics in 1960. Also same engine as the D7E apearance but 7E had increased cooling and different heads than did the early D7D series, 7E has a wider radiator, 180 hp compared to 140 in D7D late 17A, looks huge compared to the 7D, also has a belt driven generator instead of gear drive for the D7D. The D7F has either the 3306 or 333 depending on source and order, 3306 should be certain in later models as did the D6Cs. Whayne had two 7Fs in for certified rebuilt last year for the Army. They had around 1500 hours each on them.
The D8H surely has a turbo as its older sister D7D here has. The four cylinder version in the 7 holds 18 gallons of coolant and was one of my first indepth experiences with coolant cleanliness and treatment from the mechanics at Whayne.
There were many D8Hs working pulling scrapers when labor was cheap in comparison to iron. The D8K followed the 8H in around 1975, depending on overlaping series, and had the spacer plate engine as did many models of D7Gs. 7Gs were good tractors and were built for many years including past the D6E of the mid ninetys.
I really think the 8Ks had a more modern engine, can't advise what it was but sure it was different than the huge lumbering big block of the 7Ds, Es, and 8Hs. D7 17A 18692 has 1250 operating rpm on the tag. Not to run down the 'huge lumbering big blocks' as they seem to run forever - operator or service error usually puts them in the service bay. Low liners is one drawback to the older engines, that's why the spacer plate engine made its debute. When compression or coolant showed a low liner, the block was counterbored to accept a single spacer to bring the block back to specs.
Edited by dave morgan 12/12/2007 16:00
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D8h info Dave Morgan?
