Komatsu PW160-7H Operation & Maintenance Manual page 304

SERVICE PROCEDURE
2. Starting engine
Start the engine according to "STARTING ENGINE (158)" keep
running the engine at low idling for 10 minutes, and carry out the
following procedure.
3. Bleeding air from cylinders
1. Run the engine at low idling, for 5 minutes after engine start.
Extend and retract each cylinder 4 - 5 times without operating
it to the end of its stroke. (Stop approx. 100 mm before the
end of the stroke)
2. Next alter engine speed to Max., and operate each cylinder to
the end of its stroke 3 - 4 times.
3. After this, operate each cylinder 4 - 5 times to the end of its
stroke to completely bleed the air.
NOTICE
If, at first, the engine is run at high speed or the cylinder
is operated to the end of its stroke, the air inside the cylinder
may cause damage to the piston packing or other parts.
304
MAINTENANCE
PW160-7H VEAM390100