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Group 21 Engine Body
Grinding dim. for undersize crankshaft
Crankpin diam. undersize 0.25 [0.0098], mm [in]
Finishing dimension .. 124.68–124.70 [4.9087–4.9094]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff.e 0.02 [0.0008] max
Crankpin diam. undersize 0.50 [0.0197], mm [in]
Finishing dimension .. 124.43–124.45 [ 4.8988–4.8996]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Crankpin diam. undersize 0.75 [0.0295], mm [in]
Finishing dimension .. 124.18–124.20 [4.8890–4.8898]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Crankpin diam. undersize 1.00 [0.0394], mm [in]
Finishing dimension .. 123.93–123.95 [4.8791–4.8799]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Journal diam. undersize 0.25 [0.0098], mm [in]
Finishing dimension .. 169.67–169.69 [6.6799–6.6807]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Journal diam. undersize 0.50 [0.0197], mm [in]
Finishing dimension .. 169.42–169.44 [6.6701–6.6709]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Journal diam. undersize 0.75 [0.0295], mm [in]
Finishing dimension .. 169.17–69.19 [6.6602–6.6610]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Journal diam. undersize 1.00 [0.0394], mm [in]
Finishing dimension .. 168.92–168.94 [6.6504–6.6512]
Roundness ................ Dia. Diff. 0.01 [0.0004] max
Cylindricity ................ Dia. Diff. 0.02 [0.0008] max
Grinding the crankshaft
Refinish the crankshaft according to the dimensions
of the undersize main bearing and connecting rod
bearing.
When grinding the crank pins and journals, be sure to
produce the same fillet radius as the original. They
should have a hardness of 590 (Vickers Hardness
Number). If necessary, re-harden the crank pins and
journals, and inspect them for cracks by conducting a
Magnaflux (magnetic particle) test. After grinding, fin-
ish the journals and crank pins to 0.2 Ra.
131
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