TM 9-2330-356-14
Power Train (Flg. 7-7)
(4) The valve opening and closing is timed by the
camshaft gear and crankshaft gear. The sequence is as
The power train includes the cylinder head and cylinder
follows:
block assemblies:
(a) Intake open, exhaust closed: Air is
a.
Cylinder Head Assembly.
drawn into cylinder while piston is moved down.
(1) The cylinder head assembly consists of the
(b) Intake closed, exhaust closed: Piston
intake and exhaust valves, valve springs, rocker arms,
moves upon compression stroke. Ignition occurs near top
shields, push rods, injection nozzles, and glow plugs.
dead center when fuel is injected.
(2) The valve lifters are driven by the camshaft,
(c) Intake closed, exhaust closed: Piston
and transfer motion to the intake and exhaust valves
moves down on power stroke, transferring force to
through the push rods and the rocker arms.
crankshaft.
(d) Intake closed, exhaust open: Piston
(3) When the push rod moves down, the valve
moves up, forcing burned gases out of open valve to
spring forces the valve to close against the valve seat and
exhaust system.
seal off the combustion chamber.
