ZEST BOLT Service Manual

Revotron 1.2T 63 F. Cylinder Head Valve Guides : 1. Remove the valve guide oil seals and inspect the condition and fit of the valve guides in the cylinder head. 2. Replace the cylinder head when excessive clearance exists between the guides and the valve stem or the valve has stuck inside the guide. 3. Check the valve guide bore in the cylinder head. If the bore is damaged or out of round, or damaged, replace the cylinder head. 4. Replace the valve guide oil seals using the valve guide oil seal drift (2702 5890 06 17) Valve Guide Specification (Revotron 1.2T) Dimension Intake Valve Exhaust Valve Valve Guide Bore in Cylinder Head 12.99 (+0.003/-0.010) 12.99 (+0.003/-0.010) Valve Guide O.D. Normal : 13.0 (+0.046/+0.028) Normal 1 : 13.5 (+0.046/+0.028) Normal : 13.0 (+0.046/+0.028) Normal 1 : 13.5 (+0.046/+0.028) Valve Guide I.D. Normal : 7 (+0.020/+0.005) Normal 1 : 7 (+0.020/+0.005) Normal : 7 (+0.020/+0.005) Normal 1 : 7 (+0.020/+0.005) Valve Guide Length 39.5 mm 46 mm Note : Valve Guides and Valve Seats are separately not serviceable. They come along with the cylinder head as an assembly