V8 Engine 3.5 3.9 4.2
ENGINE
50
OVERHAUL
3. Measure each journal for overall wear and
ovality, make 3 checks at 120
°
intervals.
Main bearing journal diameter = 58.409 to
58.422 mm (2.29 to 2.30 in)
Maximum out of round = 0.040 mm (0.002 in)
Big-end bearing journal diameter = 50.800 to
50.812 mm (1.99 to 2.00 in)
Maximum out of round = 0.040 mm (0.002 in)
If measurements exceed permitted maximum,
regrind or fit new crankshaft.
NOTE: Crankshaft main bearings are
available in 0.254 and 0.508 mm (0.01 and
0.02 in) oversizes. When fitting 0.508 mm
(0.02 in) oversize bearings, centre main bearing,
which controls crankshaft end-float, has thrust
faces increased in thickness by 0.254 mm (0.01
in). Therefore if 0.508 mm (0.02 in) oversize
bearings are to be fitted, 0.127 mm (0.005 in)
must be machined off each thrust face of centre
main bearing shell to achieve correct end-float.
Ensure an equal amount of material is removed
from each thrust face.
Crankshaft dimensions:
Bearing journal radius - all journals except rear main
journal A = 1.90 to 2.28 mm (0.075 to 0.09 in).
Rear main bearing journal radius B = 3.04 mm
(0.012 in)
Bearing journal diameter C :
Standard = 58.409 to 58.422mm (2.29 to 2.3 in).
0.254 mm (0.01 in) undersize = 58.154 to 58.168
mm (2.290 to 2.300 in)
0.508 mm (0.02 in)undersize = 57.900 to 57.914 mm
(2.280 to 2.281 in)
Bearing journal width D = 26.975 to 27.026 mm
(1.062 to 1.064 in).
Bearing journal diameter E :
Standard = 50.800 to 50.812 mm (1.99 to 2.00 in).
0.254 mm (0.01 in) undersize = 50.546 to 50.558
mm (1.98 to 1.99 in)
0.508 mm (0.02 in) undersize = 50.292 to 50.305
mm (1.97 to 1.98 in)
1. Check crankshaft spigot bearing for wear,
replace if necessary:
Spigot bearing inside diameter = 19.177 +
0.025 - 0.000 mm (0.75 + 0.001 - 0.000 in)
