6-33. PISTON REPAIR - Continued
Matchmark piston pin, piston crown, piston
skirt and piston pin bearing before removal.
(9) Remove piston pin (9).
Separate piston crown (10) from piston skirt (11).
Remove metal seal ring (12) from piston crown (10).
Remove piston pin bearing (13).
Dry cleaning solvent P-D-680 is potentially
dangerous. Avoid repeated and prolonged
breathing of vapors and skin contact with the
liquid. Do not use near open flame, arcing
equipment or other ignition sources. Always
wear eye protection and protective clothing.
The flash point of P-D-680 is 100 to 138 deg.
F (38 to 59 deg. C).
(1) Clean all metal parts with dry cleaning solvent (Item 3, Appendix E).
(2) Clean ring grooves and oil holes in pistons with paint brush (Item 44, Appendix E) and dry cleaning
Compressed air used for cleaning purposes
will not ex- ceed 30 psi (207 kPa). Use only
with effective chip guarding and personal
protective equipment (gog- gles/shield,
(3) Dry parts with compressed air.
(4) Inspect all parts for damage. Replace damaged parts.
(5) Check fire ring groove (1) of piston crown (2) with piston
groove gauge tool (Appendix B, Section III, Item 49).
Piston crown, bearing, and pin must be
replaced as an assembly.
(6) Slide groove gauge completely around groove (1). If wire
is below flush at any one area, replace crown (2).