Connecting Rod Assembly Weight Rank; Bore Diameter And Roundness Of Connecting Rod Big End - Measure - Mitsubishi S6R Series Service Manual

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 bushing

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.
Weight rank list
Part No. Weight rank
37519-75020 A
37519-75030 B
37519-75040 C
37519-75050 D
37519-75060 E
37519-75070 F
37519-75080 G
37519-75090 H
37519-76010 I
37519-31020 M
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
131.000 to
Connecting
ø131 mm 131.025 mm
rod big end
[5.16 in.] [5.1575 to
bore diameter
5.1585 in.]
6-22
Standard value
70.020 to 70.040 mm
[2.7567 to 2.7575 in.]
Allowable
Weight
value
14900 g [525.58 oz]
15000 g [529.11 oz]
15100 g [532.64 oz]
15200 g [536.16 oz]
15300 g [539.69 oz]
±30 g
[±1.05 oz]
15400 g [543.22 oz]
15500 g [546.75 oz]
15600 g [550.27 oz]
15700 g [553.8 oz]
16150 g [569.68 oz]
Round-
Limit value
value ness limit
Minimum:
130.950 mm
[5.1554 in.] 0.100 mm
Maximum: [0.0039 in.]
131.050 mm
[5.1593 in.]
Bushing inner surface roughness
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
1.6S
Connecting rod bushing
inside diameter
Weight rank mark location
Rear