8-14. CYLINDER COMPRESSION TEST (Cent)
Position rocker arms (5) over pressure
gage and adapter (15) and exhaust valves.
Install two rocker arm shaft bolts (4) and
torque to 90-100 Ib-ft (122-136 N-m).
Do not crank engine using starter
motor to obtain compression
pressure. Engine must be running
to obtain accurate reading.
Variation in compression pressures
between cylinders must not exceed
25 PSI (172 kPa) at 600 RPM.
Use spare fuel line to fabricate a
jumper connection between fuel
inlet and return manifold
connectors. Fuel line cannot be
reinstalled on engine.
Install spare fuel line (17) between inlet
manifold (18) and return manifold (19).
Avoid contact with hot
manifolds, pulleys, and
other moving parts to avoid
Wear proper ear protection
when running engine. Noise
volume of engine can cause
hearing loss or injury.
Protective turbocharger air
inlet shield must be
Installed prior to doing
maintenance when engine Is
running and air Inlet has
been removed. Contact with
rotating blades will cause
injury to personnel.
Run engine in clean area when air
intake ducting is removed. Dirt, dust,
and particles in unfiltered air can
enter engine and damage parts or
cause mechanical failure.
i. Start engine and run at 600 RPM. Record
pressure shown on cylinder tester gage.