Crankshaft - Inspection

15. Check core plugs in cylinder block for corrosion or signs of leakage, seal replacement plugs with Loctite 243.

Crankshaft - Inspection

1. Check crankshaft main and big-end bearings for scoring, wear and ovality, make 3 checks at 120° intervals in centre of journals. l Main bearings = 62.0 mm ± 0.013 mm (2.441 in ± 0.001 in). l Big-end bearings = 54.000 mm ± 0.01 mm (2.125 in ± 0.0004 in).
2. Crankshafts may not be reground, only one size of main and big-end bearing shell is available and if journals are found to be scored, oval or worn, crankshaft must be replaced. Main and big-end bearing shells and thrust washers must be replaced whenever they are removed.
3. Check crankshaft spigot bush for wear, replace if necessary using the following procedures:
4. Secure crankshaft in a suitably padded vice.
5. Tap a thread in spigot bush to accommodate a suitable impulse extractor.
6. Fit impulse extractor to spigot bush.
7. Remove spigot bush.
8. Clean spigot bush recess in crankshaft.
9. Fit new spigot bush to crankshaft using a suitable mandrel.

Reassembly

1. Fit oil squirt jets, fit Torx screws and tighten to 8 Nm (6 lbf.ft).
2. Lubricate new, grooved, main bearing shells with engine oil and fit to cylinder block.
3. Lubricate new thrust washers with engine oil and fit, grooved side facing outward, to recess in each side of No.3 main bearing in cylinder block.
4. Lubricate crankshaft journals with engine oil and using assistance, position crankshaft in cylinder block.
5. Lubricate new, plain, main bearing shells with engine oil and fit to main bearing caps.
6. Fit main bearing caps in their original fitted positions ensuring reference marks are aligned.
7. Fit and lightly tighten new main bearing cap bolts. Do not lubricate bolt threads.
8. Starting with No.3 main bearing cap and working outwards, tighten main bearing cap bolts to: l Stage 1 - 33 Nm (24 lbf.ft) l Stage 2 - Further 90°

CAUTION: Do not carry out stages 1 and 2 in one operation.

9. Check that crankshaft rotates smoothly.

10. Attach a magnetic base DTI to front of cylinder block with stylus of gauge on end of crankshaft.