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SECTION 10
INSPECTION AND RECONDITIONING
Stuck, Broken Rings
Figure 10-12. Common Types of Piston and Ring Damage.
Service
Some important points to remember when servicing
piston rings:
1. If the cylinder block does not need reboring and if
the old piston is within wear limits and free of
score or scuff marks, the old piston may be
Magnum M18 and M20 service replacement pistons
are available in STD bore size, and in .003", .010",
:020", and .030" oversizes.
Replacement pistons in-
clude new piston ring sets and new piston pins.
reused.
Service replacement piston ring sets are also avail-
2. Remove old rings and clean up grooves. Never
able separately for STD/.003" (same ring set for both
reuse old rings.
sizes), .010", 1020", апа .030" oversized pistons. Al-
3. Before Installing new rings on piston, place top
ways use new piston rings when installing pistons,
two rings, each in tum, in its running area in cylin-
Naver reuse. old rings:
der bore and check end gap (see Figure 10-13).
The cylinder bore must be deglazed before service
This gap should be .010"/.032" in a used cylinder
ring sets are used.
bore and .010"/.023" in a new cylinder bore.
10.11
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