ENGINE
3.33
Piston
Ring
Feeler Gauge
Piston Ring-to-Ring Groove Clearance
Top Ring Limit: 0.0019” ± 0.00069”
(0.0475 ± 0.0175 mm)
Second Ring Limit : 0.0017” ± 0.00049”
(0.0425 ± .0125 mm)
PISTON RING INSTALLED GAP
1. Place each piston ring (A) inside cylinder (B)
using piston to push ring squarely into place as
shown. (See next page)
25-50mm
B
A
C
Piston Ring Installed Gap
Top Ring: 0.01181” ± 0.00393”
(0.30 ± 0.10 mm)
Second Ring Limit: 0.01476” ± 0.00492”
(0.375 ± 0.125 mm)
Oil Ring Limit: 0.00984” ± .00393”
(0.25 ± 0.10 mm)
Top Ring Limit: 0.01083” ± 0.00295”
(0.275 ± 0.075 mm)
Second Ring Limit: 0.0177” ± 0.00394”
(0.45 ± 0.10 mm)
Oil Ring Limit: 0.0177” ± .00984”
(0.45 ± 0.25 mm)
600
700
NOTE: Ring should be installed with the mark on the
ring facing upward.
2. Measure installed gap with a feeler gauge (C) at
both the top and bottom of the cylinder.
REMINDER: A difference in end gap indicates
cylinder taper. The cylinder should be measured
for excessive taper and out of round.
3. If the bottom installed gap measurement exceeds
the service limit, replace the rings. If ring gap is
smaller than the specified limit, file ring ends until
gap is within specified range.
NOTE: Always check piston ring installed gap after
re-boring a cylinder or when installing new rings. A
re-bored cylinder should always be scrubbed
thoroughly with hot soapy water, rinsed, and dried
completely. Wipe cylinder bore with oil immediately to
remove residue and prevent rust.
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