Crankshaft
Runout:
Check the crankshaft for runout and if the dial gauge reading ex-
ceeds the limit, replace the crankshaft.
NOTE:
Measure the runout at the center journal. Rotate the crank-
shaft slowly.
Crankshaft thrust play:
Measure this play with crankshaft set in the cylinder block in the
normal manner, that is, with the thrust bearing fitted and the
bearing caps installed. Tighten bearing cap bolts to specified
torque. Use a dial gauge to read the displacement in axial
(thrust) direction of the crankshaft. If the limit is exceeded, re-
place thrust bearing with new standard one or oversize one to
obtain standard thrust play.
Tightening Torque
(a): 46 N·m (4.6 kg-m, 33.5 Ib-ft)
Out-of-round and taper (uneven wear):
An unevenly worn crankshaft journal or crankpin shows up as a
difference in diameter at a cross section or along its length (or
both). This difference, if any, is to be determined from microme-
ter readings taken as shown in figure.
If any of the journals or crankpins is badly damaged or if the
amount of uneven wear in the sense explained above exceeds
the limit, repair (by re-grinding) or replace the crankshaft.
NOTE:
Where journal or crankpin re-grinding is necessary, finish
the diameter to the size necessary for the undersize bear-
ing. (Refer to Crankpin-to-bearing clearance of previous
page.)
6A-30
ENGINE MECHANICAL (F8B ENGINE)
Limit on crankshaft runout
0.06 mm (0.002 in.)
Item
Standard
Limit
Crankshaft thrust play
0.13 – 0.28 mm
(0.005 – 0.011 in.)
0.35 mm
(0.014 in.)
Thickness of
Standard
2.500 mm
(0.0984 in.)
Thickness of
crankshaft
Oversize:
0.125 mm
2.563 mm
crankshaft
thrust bearing
Oversize:
(0.0049 in.)
(0.1009 in.)
thrust bearing
Oversize:
0.250 mm
(0.0098 in.)
2.625 mm
(0.1033 in.)
Limit on uneven wear
0.01 mm (0.0004 in.)
