Cylinder head

A Valve stem installed height

7. Insert intake and exhaust valves in the head and measure valve stem installed height.

Intake Valve Stem Installed Height:
Standard (New): 48.245 – 48.715mm
Service Limit: 48.965mm

Exhaust Valve Stem Installed Height:
Standard (New): 50.315 – 50.785mm
Service Limit: 51.035mm

8. If valve stem installed height is over the service limit, replace the valve and recheck. If still over the service limit, replace the cylinder head; the valve seat in the head is too deep.

CYLINDER HEAD

Warpage

Note: If camshaft-to-holder oil clearances are not within specification, the cylinder head cannot be resurfaced.

A Precision straight edge

1. If camshaft-to-holder oil clearances are within specifications, check the cylinder head for warpage.

• If warpage is less than 0.05mm cylinder head resurfacing is not required.
• If warpage is between 0.05mm and 0.2mm, resurface cylinder head.
• Maximum resurface limit is 0.2mm based on a height of 100mm.

2. Measure along edges, and 3 ways across centre.

Cylinder Head Height:
Standard (New): 99.95 – 100.05mm

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