Crankshaft and main bearings (page 2 of 4)

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 crankshaft.
12. Remove main bearings from cylinder block and main bearing caps.
13. Remove key from keyway.
14. 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)