TM 9-2320-302-34
0027 00-11
ROCKER ARM ASSEMBLIES MAINTENANCE - CONTINUED
0027 00
ADJUSTMENT - CONTINUED
b.
Bar engine in direction of rotation and observe intake and exhaust valve rollers at any cylinder that is close to TDC
(top dead center). Choose a cylinder that has exhaust valves almost completely closed. Just as exhaust valves are
closing, intake valves will start to open. This is the valve overlap period.
VALVE OVERLAP PERIOD
EXHAUST VALVE
ROCKER ARM
ASSEMBLY
EXHAUST VALVE
CLOSING
FUEL INJECTOR
ROCKER ARM
ASSEMBLY
CAMSHAFT
ROCKER
ARM SHAFT
CYLINDER
HEAD
INTAKE VALVE
ROCKER ARM
ASSEMBLY
INTAKE VALVE
STARTS TO OPEN
