3-34
ENGINE
PISTON-RING-TO-GROOVE
CLEARANCE
Measure the side clearances
of
the 1 st and 2nd piston rings
using the thickness gauge.
If
any clearance reading exceeds the
service limit, replace both the piston and piston rings.
Itil:I
09900-20803:
Thickness
gauge
09900-20205:
Micrometer
(0 -
25
mm)
~
Piston-ring-to-groove
clearance
Service
Limit:
1 st: 0.18
mm
(0.0071 in)
2nd:
0.15
mm
(0.0059 in)
~
Piston
ring
groove
width
Standard:
1st:
0.78 - 0.
80
mm
(0.0307 - 0.0315 in)
1.30 - 1,
32
mm
(0.0512 - 0.0520 in)
2nd:
0.
81
- 0.83
mm
(0.0319 - 0.0327 in)
Oil:
2.01
- 2.03
mm
(0.0791 - 0.0799 in)
~
Piston ring
thickness
Stanaara:
1st
: 0.
71
- 0.76
mm
(0.0280 - 0.0299 in)
1.08 - 1.10
mm
(0.0425 - 0.0433 in)
2nd:
0.77 - 0.79
mm
(0.0303 - 0.0311 in)
PISTON
RING
FREE
END
GAP
AND
PISTON
RING
END
GAP
Measure the piston ring free end gap using the vernier calipers,
first,
and
then fit the piston ring squarely into the cylinder and
measure
the pi:ston ring
end
gap
usiny
LI
It::
llJit
;
klle~~
yCluye.
If
any measurement exceeds the service limit, replace the pis-
ton ring with a new one.
S 09900-20101: Vernier
calipers
~
Piston
ring free end
gap
Service
Limit:
1 st: 5.5
mm
(0.22 in)
2nd: 9.2
mm
(0.36 in)
S 09900-20803:
Thickness
gauge
~
Pistoll
r;IIg
end
gap
Service
Limit:
1 st: 0.50
mm
(0.020 in)
2nd:
0.50
mm
(0.020 in)
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