Grinding Crankshaft - Mitsubishi S6S-Y3T61HF Service Manual

4.17 Grinding crankshaft

CAUTION
(a) When grinding crank journals, be sure to grind all
the journals to the same size.
(b) Finish the fillet radius to the specified dimension.
Grind the crankshaft journal (or pin) to the diameter that fits
the inside diameter of the next undersize main (or
connecting) bearing. By doing so, the fitness check with an
actual bearing can be omitted.
When grinding, be careful not to change the fillet radius and
width. If the surface hardness is considered to have been
reduced considerably, re-harden the crankshaft and check
for flaws by means of magnetic particle inspection.
Ensure that the surface finish accuracy of the crankpins and
journals is kept within the standard even after the correction
by grinding.
Item Undersize
0.25 mm
[0.0098 in.]
Crank 0.50 mm
journal [0.0197 in.]
0.75 mm
[0.0295 in.]
0.25 mm
[0.0098 in.]
0.50 mm
Crankpin
[0.0197 in.]
0.75 mm
[0.0295 in.]
Finished size
77.705 to 77.720 mm
[3.0592 to 3.0598 in.]
77.455 to 77.470 mm
[3.0494 to 3.0500 in.]
77.205 to 77.220 mm
[3.0396 to 3.0402 in.]
57.705 to 57.720 mm
[2.2718 to 2.2724 in.]
57.455 to 57.470 mm
[2.2620 to 2.2626 in.]
57.205 to 57.220 mm
[2.2522 to 2.2528 in.]
INSPECTION AND REPAIR OF BASIC ENGINE
R3 mm
[0.12 in.]
R3 mm
[0.12 in.]
Finished dimension of fillet R
R3 mm
[0.12 in.]
6-25