>Cougarjack wrote,
>.............Jim and listers,
>In my archive of Ford tractor info, I find no mention of any "GP'
>designated engine for any tractor. (possibly I misunderstood and you were
>referring to the GP mil-vehicle?) .......
Yes, the GP motor was for the 1941 1/4 ton truck.
>The NAA tractor (there was never an "NNA" tractor) was first sold in 1953
>with the 134 cu in "Red Tiger" OHV engine. This engine was the global
>replacement for the flathead, and continued on through the rest of the
>"hundred series" tractors, the 600, the 700, the 800, the 900, etc. and on
>into the thousand series units.
That was a typo on my part and should have read NAA.
> The Ford 9N, 2N and 8N tractors all had a four cylinder flathead
> engine, NOT an overhead valve.
The basic 9N motor was the basis for the motor in the GP as well as
the 0N, 1NC, 2NC as well. The GP motor was a 9N with a fuel pump, higher
compression head, pistons, "hotter" cam which gave it more horsepower. The
9N family of motors are functionally interchangeable and I have seen
tractors with GP motors in them and vise versa for the GP. Of course this
was not a factory installation.
> Production on the flathead was terminated with the 1952 model
> year. Note also that the two engines were NOT interchangeable, as the
> entire tractor design was different. Unless there were M151
> engines around in 1953, I'd have to conclude that the tractor engine
> was first off the board. I have a 1955 tractor with the OHV engine, and
> the similarity is unmistakeable.
The M-151 motor was indeed designed first. The motor was
designed for the Truck, Utility, 1/4 ton T-122 in accordance with OCM 33521
of January 4, 1951, under contract No. DA-20-018-ORD-11283. The motor is
shown with full details photos and specifications in the Ford Motor Company
Design Study for the Ordnance Corps dated January, 1952.
The tractor motor was developed along with the jeep motor and the
Tractor Division produced many of the Ford MUTT's. There was even an
attempt by the Tractor Division to market the M-151 to farmers as a
"Specialized Farm Vehicle". This was not possible as the dies and tooling
were Government owned.
Jim Gilmore MVPA # 5843
Member Ist Michigan AOD Chapter MVPA
Great Lakes Chapter MVPA
Ohio Motor Pool Chapter MVPA
Red Ball Chapter MVPA
Ontario Military Vehicle Association
Midwest Military Vehicle Assocation
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