Operation Manual

Job Card No.:
Engine:
Filing No.:
Piston
0178-07-297 5843
Servicing:
All rings of adrawn piston must be renewed. Only in
exceptional cases and after thorough inspection pi-
ston rings having run less than 1000 hours may be
refitted.
Job:
● Remove piston rings with piston ring pliers (1).
● Free piston from carbon.
● Carefully clean ring grooves, using a ring frag-
ment as scraper. Because of the chamfered face,
scrape with the inner side of the ring and be sure
not to damage the radii of the grooves and the
groove flanks.
● Smoothen minor friction and seizure marks on the
piston running surface with fine carborundum. In
the case of major defects or heavy scoring, renew
piston.
● Before refitting a cleaned piston, gauge the
grooves, see job 02.10.02.
● Fit the piston rings, starting with the lowest. Use
only piston ring pliers for this work.
“Top” on the piston ring flanks must always
point upward.
© 0785
02.10.01 Page 2 of 3
S/BVM 628
Fig. 1 Piston ring pliers
Tools:
- Piston ring pliers (Section 1.8)
Aid:
- Ground piston ring (100 mm long)
- Fine emery cloth, No. 250
- Carborundum
Spare parts:
- Set of piston ring
Job Card:
- 02.10.02
© 24 962 1