5
5-43
4st 60 2019
a
b
c
30) Inspection of Piston Ring Side Clearance
1. Measure piston side clearance. Replace piston and piston
rings as a set if the clearance is over specified value.
Piston Side Clearance :
Top Ring a : 0.04 to 0.08 mm (0.0016 to 0.0031 in)
Second Ring b : 0.01 to 0.05 mm (0.0004 to 0.0020 in)
Oil Ring c : 0.03 to 0.13 mm (0.0012 to 0.0051 in)
Functional Limit :
Top Ring a : 0.10 mm (0.0039 in)
Second Ring b : 0.07 mm (0.0028 in)
Oil Ring c : 0.15 mm (0.0059 in)
Replace oil ring when top ring or second ring is
replaced.
31) Inspection of Piston Rings
1 Push piston ring 1 into ring gauge 70.000 mm (2.75591
in) parallel to top edge. Measure at the top or bottom of
cylinder bore with no wear.
2. When ring gauge is not available, use piston crown to push
piston ring 1 into to cylinder.
3. Measure piston ring closed gap a. Replace if the gap is over
specified value.
Piston Ring Closed Gap a :
Top Ring : 0.20 to 0.35 mm (0.0079 to 0.0138 in)
Second Ring : 0.35 to 0.50 mm (0.0138 to 0.0197 in)
Oil Ring : 0.20 to 0.70 mm (0.0079 to 0.0276 in)
Functional Limit :
Top Ring : 0.55 mm (0.0217 in)
Second Ring : 0.70 mm (0.0276 in)
Oil Ring : 1.00 mm (0.0394 in)
a
1
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