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Chapter 6 INSPECTION AND REPAIR OF BASIC ENGINE
(4) Measure the inside diameter of the connecting rod
bushing.
If the value is out of the standard, ream the inside diam-
eter to the standard.
Item
Inside diameter of connecting rod bush-
ing
4.11 Connecting Rod Assembly Weight Rank
When replacing a connecting rod, be sure to check the
weight rank of the connecting rod, and use the connecting
rod having the same weight rank mark. All the connecting
rods in one engine must have the same weight rank mark.
Weight rank list
Part No.
Weight rank
32619-81110
A
32619-81210
B
32619-81310
C
32619-81410
D
32619-81510
E
32619-81610
F
32619-81710
G
32619-81810
H
Note: The weight rank of connecting rod assembled in en-
gine is also stamped on caution plate.
4.12 Bore Diameter and Roundness of Connecting Rod Big End - Measure
Measure the connecting rod bore diameter at front and rear
ends respectively in the directions A, B and C as shown in
illustration.The roundness is determined by subtracting the
minimum value from the maximum value among measure-
ments of A, B and C.
If the value exceeds the limit, replace the connecting rod
with a new one.
Nominal
Standard
Item
value
value
Connecting
110.000 to
rod big end
ø110 mm
110.022 mm
bore diame-
[4.33 in.]
[4.3307 to
ter
4.3316 in.]
6-20
Standard value
58.020 to 58.040 mm
[2.2843 to 2.2850 in.]
Allowable
Weight
value
7100 g
[250 oz.]
7200 g
[254 oz.]
7300 g
[257 oz.]
7400 g
[261 oz.]
±20g
[0.71 oz.]
7500 g
[264 oz.]
7600 g
[268 oz.]
7700 g
[271 oz.]
7800 g
[275 oz.]
Round-
Limit value
ness limit
Minimum:
109.950 mm
[4.3287 in.]
0.100 mm
Maximum:
[0.0039 in.]
110.050 mm
[4.3327 in.]
Bushing inner surface
roughness
1.6S
Ra0.4μm
Connecting rod
bushing
Connecting rod
Connecting Rod Bushing Inside Diameter - Measure
Connecting Rod Weight Rank Mark Location
A
B
Front
C
Measurement
Measurement
point
direction
Connecting Rod Big End Bore Diameter - Measure
Inside diameter of
connecting rod bushing
Weight rank mark location
Rear
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