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Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
4.16 Connecting Rod Bearing Thickness - Measure
Measure the thickness of connecting rod at its center.
If the value exceeds the limit, replace both upper and lower
connecting rod bearing shells with new ones as a set.
When the crankshaft is re-ground due to wear of crank pin,
use the undersize bearing.
For the crankshaft grinding procedure, refer to "Crankpin
and Crank Journal - Grind" of "INSPECTION AND
REPAIR OF BASIC ENGINE."
Note: Replacement shells for undersized connecting rod
bearing are available in sizes of 0.25, 0.50, 0.75 and
1.00 mm [0.0098, 0.0197, 0.0295 and 0.0394 in.]
Connecting Rod Bearing Thickness - Measure
4.17 Connecting Rod Bend and Twist - Inspect
(1) Measure the dimensions of C and L as shown in illus-
tration to check the bend and twist of connecting rod.
Straighten the connecting rod with a press so that the
measurement value meets the standard.
If the value exceeds the limit, replace the connecting
rod with a new one.
Note: Tighten the connecting rod cap to the specified torque
and check the bend and twist.
(2) To inspect the connecting rod with the piston installed,
turn the piston upside down and place it on a surface
plate. Insert a round bar having the same diameter as
the crankpin into the big-end bore, and measure the
height of the bar with dial gauge.
Connecting Rod Bend and Twist - Inspect
Deflection of Connecting Rod - Measure
Measurement
at the center
of bearing
Item Size Nominal value Standard value Limit value
Connecting rod bearing
thickness at center
Standard
3.000 mm
[0.1181 in.]
2.957 to 2.970 mm
[0.1164 to 0.1169 in.]
2.930 mm
[0.1154 in.]
Under size
0.25 mm
[0.0098 in.]
3.125 mm
[0.1230 in.]
3.082 to 3.095 mm
[0.1213 to 0.1219 in.]
3.055 mm
[0.1203 in.]
0.50 mm
[0.0197 in.]
3.250 mm
[0.1280 in.]
3.207 to 3.220 mm
[0.1263 to 0.1268 in.]
3.180 mm
[0.1252 in.]
0.75 mm
[0.0295 in.]
3.375 mm
[0.1329 in.]
3.332 to 3.345 mm
[0.1312 to 0.1317 in.]
3.305 mm
[0.1301 in.]
1.00 mm
[0.0394 in.]
3.500 mm
[0.1378 in.]
3.457 to 3.470 mm
[0.1361 to 0.1366 in.]
3.430 mm
[0.1350 in.]
Item Standard value
Connecting rod bend and twist
(C/L, C/D)
0.05/100 mm [0.0020/3.94 in.] or
less
Piston pin
Connecting rod twist
Connecting rod bend
L
C
C
L
C
L
C
100 [3.937]
0.05 [0.002]
L
=
=
Unit: mm [in.]
Tightening torque
Bolt ID mark "AL" and "AU":Þ“
637 ± 31.9 N·m {65 ± 3.25 kgf·m} [470 ± 23.5 lbf·ft]
2-time tightening method [wet]
100 [3.937]
0.05 [0.002]
C
D
D
C
0.05 [0.0020]
Unit: mm [in.]
Surface plate
100 [3.94]
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