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TM 10-3930-644-14&P
TOPIC 1. DESCRIPTION AND SPECIFICATIONS
A. DESCRIPTION
drive is provided by the crankshaft timing gear. A gear
The engine (Figure 1-1) is a four-stroke-cycle and L-type
located on the camshaft drives the oil pump shaft and its
head design, with the valves arranged in the engine
coupled distributor drive shaft.
The fuel pump is
block. The main body consists of a single unit cylinder
actuated by an eccentric cam located towards the rear of
block and crankcase with integrally cast cylinders.
the shaft.
The aluminum pistons have four rings: The top two for
The main and connecting rod bearings are of precision
compression, the third for scraping and the three-piece
construction.
bottom ring for oil control. The full floating piston pins
are retained by snaprings.
The entire length of the heat treated, steel forged
connecting rods is rifle drilled for pressure lubrication of
The front drive gear is keyed and pressed in place, and
the piston pins.
is sealed to the crankcase by a die cast filler block. The
rear shaft extension is sealed to the crankcase by a die
The cylinder head is constructed of special alloy iron
cast oil guard and a filler block.
with carefully engineered water passages to ensure
optimum cooling.
The camshaft rotates in bearings located in the three
main crankcase bulkheads. Camshaft
The intake manifold has individual porting (Figure 1-2)
whereby each cylinder is fed with the fuel-air mixture
individually and not influenced by other cylinders of the
engine.
Figure 1-1. Cylinder Block Disassembled
M-104-1
2-1B
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