300Tdi Discovery
Tdi
21
REPAIR
23. Remove rocker cover.
24. Remove nuts and bolts and withdraw rocker
shaft assembly.
25. Remove push rods, store as an identified set to
allow refitment to same location.
26. Remove valve stem caps.
27. Evenly slacken, then remove, bolts retaining
cylinder head to block. Two of the bolts also
secure the air cleaner mounting bracket.
28. Lift off cylinder head and remove gasket.
Refit
29. Ensure face of cylinder block is thoroughly clean.
30. Select new gasket of correct thickness.
CAUTION: Three thicknesses of gasket are
available, different thicknesses are
identified by the number of small holes
punched in the right hand side of the gasket. One
hole identifies the thinnest gasket and three holes
the thickest. When renewing gaskets the gasket
being fitted must be of the same thickness as the
one removed. Therefore if the removed gasket had
two holes punched in the side the replacement
gasket must also have two holes punched in the
side.
31. Place gasket on cylinder block with identification
holes positioned towards rear on right hand side
and side marked TOP uppermost.
32. Clean mating face of cylinder head.
33. Lower cylinder head onto block ensuring correct
location with dowels.
