Workshop Manual

14–6 REPAIR STANDARDS
Major Name
Inspection Item
Nominal Assembly
Limit Repair Procedure Comments
Category
of Part Dimension Standard Value
Dia. 80
Uneven wear on journal (3.1496) 0.05
Replace
and pins
Dia. 64
(0.002)
(2.5197)
Journal Diameter 6BG1
Center 79.905 – 79.925 Bearing only (3.1459 – 3.1467)
Replace
Other 79.919 – 79.939 Bearing (3.1464 – 3.1472)
4BG1 All Bearing
79.905 – 79.925
Replace
(3.1459 – 3.1467)
Pin Diameter
63.924 – 63.944
Replace
(2.5167 – 2.5175)
Journal and pin finish Ellipse and precision (taper and taper 0.007 ellipse) (0.0003) Journal and bearing arc
Use those with projection
spread
and proper arc; take care with back side fit
Clearance
6BG1
Center 0.039 – 0.098
between journal
Bearing only (0.0015 – 0.0039)
and bearing
Other 0.025 – 0.084 0.11
Replace bearing
Bearing (0.0010 – 0.0033) (0.0043)
4BG1 All Bearing
0.039 – 0.098
(0.0015 – 0.0039)
Journal bearing Undersize bearings cannot undersize be used Crankshaft end play
0.15 – 0.33 0.4
Replace thrust bearings
Measure at crankshaft’s
(0.006 – 0.013) (0.016) No. 4 bearing thrust surface
Crankshaft runout
0.05 or less 0.4
Replace
(0.002) (0.016)
Perform lapping on gears
Ring gear with burrs; in cases of
severe damage, replace.
Crankshaft balance
36 or less Check dynamic balance
(Ref. value)
(g-cm) At ends of journal
Main Operating Parts
Crankshaft
Do not attempt to grind: always replace with new parts