Mitsubishi 4DQ3 Service Manual page 16

(2) Crankpins
{a) Inspect each crankpin for surface flaws such as
roughing, scratches, pitting and bums, and, as
necessary, repair the crankpins by grinding to
the next undersize or replace the crankshaft.
(b) Mike each crankpin to take a total of four
readings to detennine the wear, out-of-round
and taper. If any of the limits is exceeded,
repair by grinding to the next undersize or
replace the crankshaft.
Specifications
Standard
Item
6 5 -0.0lS
Diameter of
-0 . 035
journals
(2 559 - o.o oos9
· _-0.00138
Out of round-
ness of crank-
O.Ql (0.0004),
pins and journals
max
Taper of crank-
pins and journals
58 - o . o Js
Diameter of -0.0SS
crankpins
c 2 28 r o.
·
-0 . 00217
0.03-0.089
Fit of journals
(0.0012-
in main bearings
0.00350)
Unit: mm (in.)
Repair
Service
limit
limit
-0.15
-0.9
(- 0.0059) (-0.035)
0.03
(0.0012)
•
-0.20
001J s )
(-0.008)
0.2
(0.0079)
Uneven
wear:
0.03
(0.0012)
Miking crankshaft crankpins