Intake and Exhaust Valves/Specifications CTM2 (19APR90) 15-4 16, 18, 20 & 24HP Onan Engines AllTractorManuals.com 130495 TAPPETS Item New Specification Wear Tolerance Tapped O.D. 18.99—19 mm 18.90 mm (0.744 in.) 2. Tappet Bore (0.747—0.748 in.) 2. Tappet Bore I.D. 19.06—19.09 mm (0.750—0.751 in.) 19.15 mm (0.754 in.) 3. Tappet-To-Bore Clearance 0.04—0.08 mm (0.0015—0.003 in.) 0.15 mm (0.006 in.) Valve Seats Item New Specification Wear Tolerance 1. Valve Seat Angle 45˚ 2. Valve Seat Width 0.8—1.2 mm (0.031—0.047 in.) Valve Guides Item New Specification Wear Tolerance Valve Guide I.D. (B43E, 8.74—8.79 mm 8.84 mm (0.348 in.) B43G, B48G, T260 Engines) (0.344—0.346 in.) Valve Guide I.D.
(P218G, 7.14—7.16 mm 7.19 mm (0.283 in.) and P220G Engines) (0.281—0.282 in.) 2. Intake Valve Stem Clearance 0.03—0.06 mm 0.13 mm (0.005 in.) (0.001—0.002 in.) 3. Exhaust Valve Stem Clearance 0.06—0.10 mm 0.15 mm (0.006 in.) (0.002—0.004 in.) Valve Clearance Item New Specification Wear Tolerance 1. Intake Valve 0.13 mm (0.005 in.) 2. Exhaust Valve 0.33 mm (0.013 in.) M98,2015K,5 -19-10FEB87 15 4