3
3.63
PISTON / PISTON RING INSPECTION
1. Measure piston ring to ring land clearance with a
thickness gauge (A) inserted between bottom edge
of ring (B) and piston ring land (C). Replace both
piston and rings if clearance exceeds service limit.
2. Repeat for 2nd ring.
PISTON RING REMOVAL
1. Carefully remove top compression ring
q
by hand or
using a ring removal pliers.
CAUTION
Do not expand the ring more than necessary to remove
it from the piston or the ring may break or lose radial
tension.
Carefully expand ring and lift it off the piston.
2. Repeat procedure for second ring
w
.
3. Remove (3 piece) oil control ring
e
. Remove top rail
first, then bottom rail, then the expander.
PISTON RING INSTALLED GAP
1. Place each piston ring
q
inside the cylinder . Use the
piston to push the ring squarely into cylinder.
2. Measure installed gap with a feeler gauge
w
at both
the top and bottom of the cylinder.
NOTE
A difference between top and bottom end gap
measurements is a general indication of cylinder taper
(wear). The cylinder should be measured for taper and
out of round.
3. If the installed gap measurement exceeds the service
limit, replace the rings.
MEASUREMENT
Piston Ring Installed Gap
Top: 0.014" ± 0.008" (0.36 ± 0.20 mm)
Second: 0.014" ± 0.008" (0.36 ± 0.20 mm)
Oil Control Rails:
0.0196" ± 0.010" (0.50 ± 0.25 mm)
IMPORTANT
Always check piston ring installed gap when installing
new rings and/or a new cylinder.
ENGINE / COOLING SYSTEM
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