Measuring Piston Pin Bore Diameter And Piston Pin Outside Diameter; Inspecting Connecting Rod Bend And Twist6-13 - Mitsubishi Heavy Industries SL Series Service Manual

4.5 Measuring piston pin bore diameter and
piston pin outside diameter
Measure the piston pin bore diameter and piston pin outside
diameter. Replace if the limit is exceeded.
Item Nominal
Piston pin out- ø 23 mm
side diameter [0.91 in.]
Clearance
between piston
pin bore and -
piston pin out-
side diameter
4.6 Inspecting connecting rod bend and twist
(1) Measure the dimensions of C and L in the illustration to
check bend and twist of the connecting rod. Straighten
the connecting rod with a press to meet the standard.
If the standard is exceeded after correction, replace the
connecting rod with a new one.
(2) In general, a connecting rod aligner is used to check
bend and twist.
Note: Before checking bend, tighten the connecting rod cap
to the specified torque.
(3) 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 using a dial gauge.
Item Standard
0.05/100 mm
Bend and twist of
[0.0020/3.94 in.]
connecting rod
or less
Standard Limit
22.944 to 23.000 mm
-
[0.9033 to 0.9055 in.]
0.006 to 0.018 mm 0.050 mm
[0.0002 to 0.0007 in.] [0.0020 in.]
Limit
0.15/100 mm
[0.0059/3.94 in.]
INSPECTION AND REPAIR OF BASIC ENGINE
Measuring
locations
Measuring piston pin bore and piston pin
C 0.05 0.0020
[ ]
L 100 3.94
C
L
Piston
pin
Connecting rod twist
Inspecting connecting rod bend and twist
Measurement with connecting rod aligner
C
A
Measuring bend of connecting rod
Measuring
directions
C 0.05 0.0020
[ ]
L 100 3.94
L
C
Connecting rod bend
Unit: mm [in.]
B
6-13