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4. Disassembly, Inspection and Reassembly of Engines
97
(2) Crankshaft
Mainly check seizure and wear of the crankpins and
journals. Since the crankshaft gear is shrink-fitted,
heat to 180 to 200 when extraction is necessary.
(a) Shaft portion color check
After washing the crankshaft, inspect it by means of
color check or a magnaflux inspector. Replace it if
cracked or heavily damaged. Slight defects shall be
corrected by grinding.
(b) Crankshaft bend
Support the crankshaft journals at both ends with
V-blocks. Use a dial gage and measure the runout at
the center journal while rotating the shaft to inspect the
bend.
Limit
0.02mm or less
(c) Crankpin and journal measurement
Measure the outside diameter, roundness and taper at
each crankpin and journal.
Correct by grinding if unevenly wear, roundness
exceeding the limit or insufficient outside diameter is
found. Replace if the defect is excessive.
Summary of Contents for 3TNV Series
Page 1: ...4TNV106 4TNV106T 4TNV94L 4TNV98 4TNV98T 3TNV82A 3TNV84 T 4TNV84 T 3TNV88 4TNV88 ...
Page 31: ...1 General 1 4 Engine External Views 16 ...
Page 32: ...1 General 1 5 Structural Description 17 ...
Page 156: ...9 Starting Motor 9 1 2 Components 141 ...
Page 157: ...9 Starting Motor 9 1 3 Troubleshooting 142 ...
Page 172: ...9 Starting Motor 9 2 3 Troubleshooting 157 ...
Page 175: ...9 Starting Motor 2 Removal of magnetic switch Remove the M6 bolts 10mm 2 160 ...
Page 185: ...9 Starting Motor 3 Brush 1 Check wear of the brush and the brush spring force 170 ...
Page 194: ...10 Alternator 179 10 1 6 Troubleshooting ...
Page 195: ...11 Electric Wiring 180 11 ELECTRIC WIRING 11 1 Electric Wiring Diagram ...
Page 213: ......