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2.3.3 Piston and Connecting Rod (Continued)
2.3.3.d Piston Ring Gap
1. Insert the piston ring into the lower part of t he cylinder
(the least worn section). Use the piston to square the
ring in the cylinder .
2. Measure the ring gap with a feeler gauge.
3. If the gap exceeds the allowable limit, replace the
ring.
Top Ring
(Keystone Type)
Factory
Specification
0.20 to 0.35 mm
0.0079 to 0. 013 in.
Allowable Limit 1.25 mm / 0.0492 in.
Second Ring
Factory
Specification
0.40 to 0.55 mm
0.016 to 0. 021 in.
Allowable Limit 1.25 mm / 0.0492 in.
OilControlRing
Factory
Specification
0.25 to 0.45 mm
0.0099 to 0. 017 in.
Allowable Limit 1.25 mm / 0.0492 in.
2.3.3.e Piston Ring to Groove Clearance
1. Clean the rings and the ring grooves, and install each
ring in its groove.
2. Measure the clearance between the ring and its
groove with a feeler gauge (with the ex ception of the
top ring, Keystone Type, which cannot be accurately
measured with a feeler gauge).
3. If the clearance exceeds the allowable limit, replace
the ring.
4. If the clearance still exceeds the a llowable limit after
replacing the ring, replace the piston.
Second Ring
Factory
Specification
0.093 to .128 mm
0.00367 to 0. 00503 in.
Allowable Limit 0.20 mm / 0.0079 in.
OilControlRing
Factory
Specification
0.020 to 0. 060 mm
0.00079 to 0. 0023 in.
Allowable Limit 0.15 mm / 0.0059 in.
2.3.3.f Connecting Rod Alignment
NOTE
Since the I.D. of the connecting rod small end
bushing isthebasis of thisprocedure, check the
bushing for wear before proceeding.
1. Install the piston pin into the connecting rod.
2. Install the connecting rod o n theconnecting rodalign-
ment tool.
3. Put a gauge over the piston pin and move it against
thefaceplate.
4. If the gauge does not fit squarely agains t the face
plate, measure the space between the pin of the
gauge and the face plate.
5. If the measurement exceeds the allowable limit, re-
place the connecting rod.
Connecting Rod
Alignment
Allowable Limit 0.05 mm / 0.002 in.