The Priest Kangaroo
Scan supplied via Mike Kendall
Both the Priest and Ram Kangaroo were powered by the Continental R975-C1 radial engine.
Early M3 Mediums tanks and Ram Cruiser tanks were fitted with the Continental R975-EC2, a licence produced Wright Whirlwind. Originally designed as an aero engine, the R975 was a 9 cylinder air-cooled radial engine with a capacity of 975 cubic inches. To make it more suitable for operation in tanks, the R975-C1 had a lower compression ratio so it could run on lower octane gasoline (80). Power output was [ 420 bhp ]. The C1 was produced in quantity by Continental Motors Corporation in Michigan. 
The top view shows the front of the engine dominated by the nine large black cylinders. This area of the engine was covered by a black fan and shroud so that cooling air would be blown back toward the cylinders (air cooled) when the unit was installed in the tank. The bottom illustration is of the rear of the engine and visible here are a number of interesting components. The unique white engine support surrounds the central portion of the case and extends to both sides where it attaches to the engine compartment walls (also white). Within the central circle of this mount can be seen the round carburettor at the twelve o'clock position and the central mounted generator below it. The exhaust pipes surround the engine and exit the tank at the rear hull overhang. To start a cold engine it was necessary to hand crank the drive shaft and turn over the engine a few rotations in order to redistribute oil evenly in all cylinders. Failure to due so before electrical starting would result in blown cylinders and cracked cases. Movies of tankers starting their radials by first hand cranking have led some to believe the engines were started this way, which they were not.

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