nissan Workshop Repair Guides

Nissan and Datsun Workshop Service and Repair Manuals

Drive Belts, Mounts, Brackets and Accessories > < Engine - New Valve Clearance Specification|Page 1072
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Valve: Service and Repair

When valve head has been worn down to 0.5 mm (0.020 inch) in margin thickness, replace valve.
The grinding allowance for the valve stem tip is 0.2 mm (0.008 inch) or less. 

Drive Belts, Mounts, Brackets and Accessories > < Engine - New Valve Clearance Specification|Page 1072