Gasket - cylinder head (page 9 of 9)

Make

Land Rover

Model

Discovery II (UK)

Section

Overhaul

Engine - Td5Gasket - cylinder head · page 9 of 9

24. Compare figures obtained with camshaft bearing clearance: l Camshaft bearing clearance = 0.04 to 0.10 mm (0.002 to 0.004 in)
25. If any bearing clearance is found to exceed figures given, repeat the above procedures using a new camshaft. If, after repeating the clearance check using a new camshaft the clearances are still excessive, a new cylinder head and camshaft carrier assembly must be fitted.
26. Remove all traces of Plastigage using an oily cloth, do not use a scraper.
27. On completion, discard camshaft carrier bolts.
28. Check free length of valve springs: l Free length = 46.75 to 47.25 mm (1.84 to 1.86 in)
29. Replace valve springs as a set, if springs are to be refitted, keep them in their fitted order.
30. Clean carbon from valves, check valves for burning, pitting or cracking; replace as necessary.
31. Clean carbon from valve seat inserts, remove all loose particles on completion.
32. Check valve seat inserts for pitting and burning. It is not permissible to recut or replace valve seat inserts.

33. Remove carbon deposits from valve guides using tool LRT-12-186 inserted from the combustion chamber face side of cylinder head. Ensure all loose particles of carbon are removed on completion.
34. Check and record diameter of each valve stem: l Valve stem diameter - Inlet = 6.907 to 6.923 mm (0.2719 to 0.2725 in) l Valve stem diameter - Exhaust = 6.897 to 6.913 mm (0.2715 to 0.2721 in)
35. Renew any valve if stem diameter is less than specified.
36. Check and record valve stem to guide clearance using the following procedures.
37. Insert each valve into its respective guide.
38. Extend valve head 10 mm (0.375 in) out of valve seat and position a DTI gauge to rear of valve head.
39. Move valve towards front of cylinder head and zero DTI gauge ensuring that stylus of gauge remains in contact with valve head.
40. Move valve towards rear of cylinder head, record gauge reading to give valve stem to guide clearance: l Inlet valve = 0.025 to 0.059 mm (0.0009 to 0.0023 in) l Exhaust valve = 0.035 to 0.069 mm (0.0013 to 0.0027 in)
41. If stem to guide clearance exceeds figures given and valve stem diameters were as specified, cylinder head assembly must be replaced; it is not possible to replace valve guides.
42. Repeat above procedures for remaining valves. Keep valves in their fitted order.
43. Check face angle of each valve, renew any valve with incorrect face angles, do not attempt to recut. l Valve face angle - inlet = 29° 48' ± 12' l Valve face angle - exhaust = 44° 48' ± 12'
44. Lap each valve to its seat using grinding paste.
45. Apply Prussion Blue to valve seat, insert valve into guide and press it firmly, without rotating on to seat.
46. Remove valve and check that a continuous, even line of Prussian Blue has been transferred on to valve face. Note that line does not have to be across whole width of valve face.
47. Remove all traces of grinding paste on completion.
48. Check valve head stand down using the following procedures.

09 Engine