S46, S56, S66, RB75 +4X4

Phaser Engine Sections 12A-10/11

Cylinder head assembly

Continued From Next

Valve guides

To inspect 12A-10

Check the valve guides for wear. The maximum clearance between the valve stem and the bore of the guide is 0,13 mm (0.005 in) for inlet valves and 0,15 mm (0.006 in) for exhaust valves. If the clearance with a new valve fitted is more than the limit, then a new valve guide must be fitted.

To remove and to fit 12A-11
Special tools:
Remover/replace for valve guides (main toot). PD. 1 D Adaptor for use with PD.1 D, PD. 1 D-1 A Adaptor for use with PD.1 D and PD.1 D-1 A, PD1 C-6

To remove
Fit the removal and replacement tool and the adaptor and pull the valve guide out of the cylinder head (A).

To fit
1 Clean the parent bore for the valve guide.

2 Lubricate the outer surface of the new guide with clean engine lubricating oil.

3 Fit the valve guide with the reduced diameter for the valve stem seal at the top. Use the tool, adaptor and distance piece to pull the valve guide into the cylinder head (B). When fitted correctly, the top of the valve guide will have a protrusion of 15,10 mm (0.594 in) above the valve spring seat.

Continue