Mitsubishi Fuso CANTER FE85DE6SLGP, Руководство по ремонту

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11-84
Grinding of crankshaft
CAUTION
• If the crankshaft is ground to an undersize, the main bear-
ings must be replaced with the undersize ones of the corre-
sponding undersize.
• See the table of the service standards for the dimension of each
part, and collect the parts as follows.
• Do not change the center-to-center distance A between the jour-
nal and pin.
A: 60 ± 0.05 mm
• Do not change the journal width B and the pin width C.
B: 33.5 mm (No. 1 journal)
35 mm (No. 2 to No. 4 journals)
35 mm (No. 5 journal)
C: 41 mm (No. 5 journal)
• Finish the fillets D smoothly.
D: R4 mm
• Carry out a magnetic inspection to check for cracks possibly
caused by grinding. Also, check that the harness of the surface
has not dropped below Shore hardness number (Hs) 75.
• Replace the crankshaft if defects are evident.
Crankshaft undersize dimensions (Unit: mm)
• When grinding, turn both the crankshaft and the grinder counter-
clockwise as viewed from the crankshaft front end.
• When finishing the crankshaft with whetstone or sandpaper, ro-
tate the crankshaft clockwise.
Inspection: Distortion of upper crankcase top surface
• If the measurement exceeds the specified limit, grind the crank-
case top surface with a surface grinder.
• Limit the amount of removed metal to make sure that the amount
of piston projection above the crankcase top surface stays within
the standard value range. (See the PISTON AND CONNECT-
ING ROD section.)
Undersizes
0.25 0.50 0.75 1.00
Finished journal
diameter
No. 1, 2, 4, 5 85.68 to 85.70 85.43 to 85.45 85.18 to 85.20 84.93 to 84.95
No. 3 85.66 to 85.68 85.41 to 85.43 85.16 to 85.18 84.91 to 84.93
Finished pin diameter 64.69 to 64.71 64.44 to 64.46 64.19 to 64.21 63.94 to 63.96
Out-of-roundness 0.01 or less
Taper 0.006 or less
+0.039
0
+0.2
0
CRANKSHAFT AND CRANKCASE