Discovery II (LT) V8-4.0L (2002)
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19. Using feeler gauges, measure and record clearance between piston and left hand side of cylinder- viewed from the front of cylinder block.
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Piston to bore clearance = 0.020 to 0.045 mm (0.001 to 0.002 in).
20. Insert piston rings into cylinder bore, use the piston to hold the rings square to bore and check the ring gap.
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1st compression ring = 0.030 to 0.050 mm (0.012 to 0.02 in).
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2nd compression ring = 0.040 to 0.065 mm (0.016 to 0.026 in).
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Oil control ring rails = 0.38 to 1.40 mm (0.015 to 0.055 in).
21. Remove piston rings from bore.
22. Fit oil control ring rails and expander, ensuring ends butt and do not overlap.
23. Fit 2nd compression ring marked 'TOP' with marking uppermost in 2nd groove.
24. Fit 1st compression ring in first groove either way round.
25. Check piston ring to groove clearance.
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1st compression ring= 0.020 to 0.060 mm (0.0008 to 0.0024 in).
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2nd compression ring = 0.020 to 0.052 mm (0.0008 to 0.0020 in).
26. Position oil control expander ring joint and ring rail gaps all at one side, between gudgeon pin and away from LH side of piston - viewed from
front of piston. Position the gaps in ring rails approximately 25 mm (1.0 in) each side of expander ring joint.
27. Position compression rings with gaps on opposite side of piston between gudgeon pin and RH side of piston - viewed from front of piston,
28. Thoroughly clean cylinder bores.
29. Lubricate piston rings and gudgeon pin with clean engine oil.
30. Lubricate cylinder bore with clean engine oil.
31. Using a suitable piston ring clamp, compress piston rings.
32. Insert connecting rod and piston into its respective cylinder bore, ensuring domed shaped boss on connecting rod faces towards front of engine on
RH bank of cylinders and towards rear on LH bank of cylinders.
33. Clean connecting rod journal and bearing cap.
34. Lubricate connecting rod journal and connecting rod bearings.
