4-15. AUXILIARY POWER UNIT - Continued
4-15.10 Engine Piston and Piston Rod.
This task covers
Shop Equipment, Automotive
Maintenance and Repair,
APU Shutdown (see para. 2-12)
Engine Dismounted from Base
(see para. 4-15.1)
Cylinder Head Removed (see para. 4-15.9)
12, Appendix E Emery Cloth
17, Appendix E Lubricating Oil
500.4601.003 011 Pan Gasket
520.4730.030 Cylinder Head Gasket
520.4730.031 Cylinder Head Gasket
520.4730.032 Cylinder Head Gasket
520.4730.033 Cylinder Head Gasket
500.4400.015 Valve Cover Gasket
500.4740.018 Push Rod Cover Seal
500.4740.025 Push Rod Cover Seal
Remove oil pan plug (1) and drain oil from
Remove oil pan capscrews (2) and washers
Remove oil pan (4) and discard gasket (5).
Rotate flywheel until piston is at bottom dead
center of its stroke.
Bend back retaining washer plate tabs and
remove capscrews (6) and washer plate (7).
Remove bottom cap of piston rod together
with bearing half.
Tap piston and piston rod upwards out of
Remove bearing half from lower end of piston
Remove piston pin retaining ring and push
piston pin out of piston and piston rod.
Separate piston and piston rod.