6-22
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.
Connecting Rod Bushing Inside Diameter - Measure
4.11 Connecting Rod Assembly Weight Rank
When replacing a connecting rod, be sure to check the
weight rank of connecting rod. In one engine, all the con-
necting rods must be of the same weight rank.
Note: The weight rank of connecting rod assembled in en-
gine is also stamped on caution plate.
Connecting Rod Weight Rank Mark Location
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.
Connecting Rod Big End Bore Diameter - Measure
Item Standard value
Inside diameter of connecting rod bushing
70.020 to 70.040 mm
[2.7567 to 2.7575 in.]
Connecting rod bushing
inside diameter
Bushing inner surface roughness
Connecting rod
Connecting rod bushing
ٖٖٖ
1.6S
Weight rank list
Part No. Weight rank Weight
Allowable
value
37519-75020 A 14900 g [525.58 oz]
±30 g
[±1.05 oz]
37519-75030 B 15000 g [529.11 oz]
37519-75040 C 15100 g [532.64 oz]
37519-75050 D 15200 g [536.16 oz]
37519-75060 E 15300 g [539.69 oz]
37519-75070 F 15400 g [543.22 oz]
37519-75080 G 15500 g [546.75 oz]
37519-75090 H 15600 g [550.27 oz]
37519-76010 I 15700 g [553.8 oz]
37519-31020 M 16150 g [569.68 oz]
Weight rank mark location
Item
Nominal
value
Standard
value
Limit value
Round-
ness limit
Connecting
rod big end
bore diameter
ø131 mm
[5.16 in.]
131.000 to
131.025 mm
[5.1575 to
5.1585 in.]
Minimum:
130.950 mm
[5.1554 in.]
Maximum:
131.050 mm
[5.1593 in.]
0.100 mm
[0.0039 in.]
A
B
C
Front Rear
Measurement
direction
Measurement
point
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