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ENGINE DIVISION SERVICE MANUAL
TM 5-4210-230-14&P-1
ENGINE
1, 3, 5 and 7 with No. 1 being at the front. The right and left
sides of "V" engines with cylinders numbered in the foregoing
manner are sometimes referred to as "even bank" and "odd
bank." The "odd" or "even" refers to the numbers of the
cylinders. For easy reference each cylinder number is cast on
the intake manifold directly over its respective. cylinder. The
firing order is 1-2-7-3-4-5-6-8. This information is also cast
on the top surface of the intake manifold.
Two "V" type fan belts driven by a pulley on the
crankshaft drive the water pump-fan combination and
alternator while another "V" type belt driven by the water
pump pulley drives the air compressor.
The water pump is mounted on the front of the engine and
supplies both cylinder banks. The alternator is mounted on
the right side of the engine with an adjustable strap to set the
proper belt tension.
A gear-type oil pump is internally mounted to the bottom of
the crankcase and is driven by a tang on the end of the
distributor shaft. The distributor, mounted in the front end of
the cylinder block assembly, is gear driven directly by the
camshaft resulting in reduced spark fanning.
NOTE: When timing the engine, attach the
timing light to the No. 1 spark plug and
adjust distributor to obtain proper initial
timing; see specifications and Figure 4.
ENGINE LUBRICATION SYSTEM
The oil pump is located in the left front corner of the
oil pan. The pump is driven from an extension on the
distributor which is gear driven from the camshaft. It draws
oil from the oil pan sump through a screen and tube
assembly. The oil pump contains an internal bypass set at 50
psig. The oil is filtered only, or cooled and filtered, before
entering the crankcase. Filter and cooler contain bypass
systems which allow oil to bypass them in the event that
either or both become plugged.
Fig. 4 Illustrating Timing Marks on Crankshaft Pulley Hub and
Engine Front Cover
1.
Timing mark
2.
T.D.C.
From the filter, oil feeds the main oil gallery which is
cross-drilled five places. The cross-drilling intersects vertical
drilling which feeds the main bearings and camshaft bearings.
The front cross-drilling intersects two additional vertical
drillings to provide full-main oil gallery pressure to the
individual tappet gallery. Oil is metered through the tappets,
up the push rods, across the rocker arms and onto the valve
tips. A front cam shaft thrust plate meters oil forward to
lubricate the camshaft drive gear, distributor gear and fuel
pump cam. Oil returns to the oil pan through drilled holes at
the front and rear of the cylinder head. These holes match
with holes in the crankcase to provide passage through the
crankcase into the oil pan.
CGES-210 Page 5
PRINTED IN UNITED STATES OF AMERICA
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