Lrt-12-037

12. Check condition of valve springs.

13. Check valve stem to guide clearance using the
14. Insert each valve into its respective guide.
15. Extend valve head approximately 13 mm (0.6
16. Move valve towards front of cylinder head and
17. Move valve towards rear of cylinder head and
10. Check the following valve dimensions. Renew
18. Renew valve guides as necessary.

valves as necessary. l Valve head diameter 'A': Inlet = 39.75 to 40.00 mm (1.56 to 1.57 in). l Valve head diameter 'A': Exhaust = 34.23 to 34.48 mm (1.35 to 1.36 in). l Valve stem diameter 'B': Inlet = 8.664 to 8.679 mm (0.341 to 0.342 in). l Valve stem diameter 'B': Exhaust – 4.0 litre engines up to engine nos. 55D 05677A; 56D 50787A and 97D 05504A = 8.651 to 8.666 mm (0.340 to 0.341 in). l Valve stem diameter 'B': Exhaust – 4.0 litre engines from engine nos. 55D 05678A; 56D 50788A and 97D 05505A and all 4.6 litre engines = 8.641 to 8.656 mm (0.340 to 0.341 in)

11. Check installed height of valve. 19. Using valve guide remover tool l Valve installed height, end of valve to base of spring seat, 'C' = 44.163 to 45.288 mm (1.741 to 1.802 in).

• Valve
• springs must be replaced as a complete
• set.

l Valve spring free length = 48.30 mm (1.90 in). l Valve spring fitted length = 40.40 mm (1.59 in). l Spring load - valve closed = 339 ± 10 N (76 ± 2.25 lbf). l Spring load - valve open = 736 ± 10 N (166 ± 2.25 lbf).

following procedures:

in) out of valve seat and position a DTI gauge to rear of valve head.

zero DTI gauge ensuring that stylus of gauge remains in contact with valve head.

record gauge reading to give valve stem to guide clearance. l Valve stem to guide clearance 'D': Inlet = 0.025 to 0.066 mm (0.001 to 0.002 in). l Valve stem to guide clearance 'D': Exhaust – 4.0 litre engines up to engine nos. 55D 05677A; 56D 50787A; 97D 05504A = 0.038 to 0.078 mm (0.0015 to 0.003 in). l Valve stem to guide clearance 'D': Exhaust – 4.0 litre engines from engine nos. 55D 05678A; 56D 50788A; 97D 05505A and all 4.6 litre engines = 0.048 to 0.088 mm (0.0019 to 0.0035 in).

LRT-12-037

press valve guide into combustion face side of cylinder head.