Intake and Exhaust Valves/Intake and Exhaust Valves IMPORTANT: Do not lap valves. The sharp seating surface between the valve and seat will be removed resulting in shorter valve life. 16. If valve faces are worn, burned or pitted, grind valves to a 44 degree face angle (A) following manufacturers instructions. If valve face margin (B) is less than 0.787 mm (0.031 in.) after grinding, replace valve. M36267 -UN-29AUG88 M98,2015K,13 -19-08OCT85 CTM2 (19APR90) 15-7 16, 18, 20 & 24HP Onan Engines AllTractorManuals.com 130495 14. Measure valve stem outside diameter.
B43E, B43G, B48G, AND T260 VALVE STEM SPECIFICATION Item New Parts Wear Tolerance -UN-29AUG88 Exhaust Valve 8.66—8.67 mm 8.64 mm (0.341—0.3414 in.) (0.340 in.) Intake Valve 8.70—8.71 mm 8.66 mm (0.3425—0.3429 in.) (0.341 in.) M35308 P21G AND P220G VALVE STEM SPECIFICATIONS Item New Parts Wear Tolerance Exhaust Valve 7.061—7.074 mm 7.05 mm (0.2780—0.2785 in.) (0.2775 in.) Intake Valve 7.099—7.112 mm 7.07 mm (0.2795—0.2800 in.) (0.2783 in.) 15. If diameter is less than wear tolerance specification, replace valve. M98,2015K,12 -19-10FEB87 15 7