Intake and Exhaust Valves/Intake and Exhaust Valves 30. Remove valve seats using a blind-hole puller. M36952 -UN-25JAN90 M98,2015K,22 -19-08OCT85 CTM2 (19APR90) 15-10 16, 18, 20 & 24HP Onan Engines AllTractorManuals.com 130495 26. Measure valve seat width after cutting. Valve seat width must be 0.8—1.2 mm (0.031—0.047 in.). 27. If seat is too wide after cutting, use a 30 degree valve seat cutter to narrow seat to specifications. -UN-29JAN90 IMPORTANT: Do not lap valve seat. Doing so will result in shorter valve life. 28. Clean the valve seats, valve guides, and valves with solvent or a vacuum. M36275 M98,2015K,20 -19-08OCT85 15 10 29.
After valve grinding or seat cutting, check valves for a tight and uniform seat. Apply dye to valve face. Install and hold valve against seat and turn slightly. -UN-29JAN90 Remove valve and look for a fine clean line on valve face. The line must be at the center of valve face and have no open spots. If necessary, cut valve seat again or replace valve seat. M36276 M98,2015K,21 -19-08OCT85