Discovery II
ENGINE - V8
12-2-74 OVERHAUL
6. Reference mark main bearing caps to aid
assembly.
7. Remove 10 side bolts securing main bearing
caps to block.
8. Collect 'Dowty' washers from side bolts. Rear
side bolts have Allen heads.
9. Starting at the centre main bearing cap,
progressively loosen, then remove 2 bolts
securing each main bearing cap.
10. Release and remove main bearing caps.
CAUTION: Keep bearing caps, bearings and
bolts in their fitted order.
11. Remove and discard cruciform seals from rear
main bearing cap.
12. Remove crankshaft.
13. Remove main bearings from cylinder block and
main bearing caps.
14. Remove key from keyway.
15. Remove rear main sealing washers.
Inspect
1. Clean crankshaft journals and bearing
locations in cylinder block.
2. Inspect main bearings for wear and renew if
necessary. Main bearings are available in two
oversizes. If 2nd oversize bearing is being
fitted, it may be necessary to grind thrust
face of centre main bearing to achieve
correct end-float.
l
Main bearing 1st oversize = 0.254 mm (0.01
in).
l
Main bearing 2nd oversize = 0.508 mm
(0.02 in).
3. Check main bearing journals for wear and
scoring. Measure for ovality; taking 3
measurements at 120
°
intervals at each end
and at centre of journals.
l
Journal diameter - standard = 63.487 to
63.500 mm (2.499 to 2.520 in).
l
1st undersize journal = 63.223 to 63.246
mm (2.511 to 2.512 in).
l
2nd undersize journal = 62.979 to 62.992
mm (2.509 to 2.510 in).
l
Journal width - standard = 26.975 to 27.026
mm (1.061 to 1.064 in).
l
Maximum ovality = 0.040 mm (0.002 in)