Translations:KAVAN S15-S180A/R FS30-FS180AR - Instruction Manual/78/en

4. If the gap is narrower than 0.04 mm or wider than 0.10 mm, carefully loosen the lock nut on the rocker arm with a 5 mm wrench; turn the adjusting screw to increase the clearance about half a turn counter clockwise. Insert 0.04 mm feeler gauge between the rocker arm and the valve and gently screw the adjusting screw (clockwise) until it hits the feeler gauge.