Intake and Exhaust Valves/Intake and Exhaust Valves CTM2 (19APR90) 15-11 16, 18, 20 & 24HP Onan Engines AllTractorManuals.com 130495 31. Clean valve guides using a valve guide brush. 32. Measure valve guide inside diameter and determine valve stem clearance (valve guide I.D. minus valve stem O.D.).
-UN-29JAN90 VALVE GUIDE SPECIFICATIONS Item New Part Wear Tolerance Valve Guide 8.74—8.79 mm 8.84 mm M36277 Diameter (B43E, (0.344—0.346 in.) (0.348 in.) B43G,B48G,T260 Valve Guide 7.14—7.16 mm 7.19 mm Diameter P218G (0.281—0.282 in.) (0.283 in.) and P220G) Intake Valve 0.03—0.06 mm 0.13 mm Stem Clearance (0.001—0.002 in.) (0.005 in.) Exhaust Valve 0.06—0.10 mm 0.15 mm Stem Clearance (0.002—0.004 in.) (0.006 in.) If valve guide diameter exceeds specifications, replace valve guide. If valve stem clearance exceeds wear tolerance specification, replace valve guide, valve, or both. M98,2015K,23 -19-10FEB87 15 11