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 TM 55-1905-219-14-7
3-173. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS
a. The cylinder block serves as the main structural part of the engine. Transverse webs provide rigidity and
strength and ensure alignment of the block bores and bearings under load.
b. The block is bored to receive replaceable cylinder liners. The cylinder block is designed to provide water
cooling below the air inlet port belt. An air box between the cylinder banks and extending around the cylinders at the air
inlet port belt conducts the air from the blower to the cylinders. Air box openings on each side of the block permit
inspection of the pistons and compression rings through the air inlet ports in the cylinder liners. The air box openings in
the cylinder block assembly are about 1 7/8 inch x 3 1/8 inch (4.76 x 7.94 cm) and are covered with cast covers. The
camshaft bores are located on the inner side of each cylinder bank near the top of the block.
c. The upper halves of the main bearing supports are cast integral with the block. The main bearing bores are
line-bored with the bearing caps in place to ensure longitudinal alignment. Drilled passages in the block carry the
lubricating oil to all moving parts of the engine.
d. The top surface of each cylinder bank is grooved to accommodate - a block-to-head oil seal ring. Each water
or oil hole is counterbored to provide for individual seal rings.
e. Each cylinder liner is retained in the block by a flange at its upper end. The liner flange rests on an insert
located in the counter- bore in the block bore. An individual compression gasket is used at each cylinder. When the
cylinder heads are installed, the gaskets and seal rings compress to form a tight metal-to-metal contact between the
heads and the block.
f. Cylinder block assemblies include the main bearing caps and bolts, dowels and the necessary plugs. Since the
cylinder block is the main structural part of the engine, the various subassemblies must be removed from the cylinder
block when an engine is overhauled.
3-3016
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