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 TM 55-1905-220-14-10
5-19. CAMSHAFT ASSEMBLY AND GEAR TRAIN - MAINTENANCE INSTRUCTIONS.
6.
Lubricating oil is supplied under pressure to the
bearings via angular drilled passages in the rear of
the cylinder block, which lead from the main oil
gallery to each rear end bearing. From the rear end
bearings, the oil passages through the drilled oil
passages in the camshafts to the intermediate
bearings and to the front end bearings.
7.
A camshaft front pulley (integral weight) is attached
to the front end of the left bank camshaft and a
water pump drive gear (bolt-on weight) is attached
to the front end of the right bank camshaft. A
camshaft gear is attached to the rear end of each
camshaft. The pulley and the gears are retained on
the camshafts with a retaining nut.
b. Camshaft gears
1.
The camshaft gears, located at the flywheel end of
the engine, mesh with each other and run at the
same speed as the crankshaft. Either one of the
gears may be driven by the crankshaft timing gear
through an idler gear, depending upon engine
rotation. Viewing the engine from the gear train end,
the right hand camshaft gear has right hand helical
teeth and the left hand camshaft gear has left hand
helical teeth. The idler gear mates with the right
hand camshaft gear on right hand rotation engines.
2. Since the two camshaft gears must be in time with
each other, timing marks are stamped on the rim of
both gears. Also, since these two gears as a unit
must be in time with the crankshaft, timing marks
are located on the idler gear and the crankshaft
gear.
5-317
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