Intake and Exhaust Valves/Intake and Exhaust Valves 2. Measure valve clearance using a feeler gauge. VALVE CLEARANCE SPECIFICATION Item Specification Intake Valve (A) . . . . . . . . . . . . . . . . . . . . . . . 0.13 mm (0.005 in.) M36284 -UN-29JAN90 Exhaust Valve (B) . . . . . . . . . . . . . . . . . . . . . . 0.33 mm (0.013 in.) M98,2015K,33 -19-08OCT85 3. If necessary, hold tappet and turn tappet screw to adjust valve clearance. M36285 -UN-29JAN90 CTM2 (19APR90) 15-15 16, 18, 20 & 24HP Onan Engines M98,2015K,34 -19-08OCT85 AllTractorManuals.com 130495 MEASURE AND ADJUST VALVE CLEARANCE 1. Turn the flywheel clockwise until the intake valve opens and then closes.
Continue turning flywheel until the TDC (top-dead-center) mark (A) on the flywheel is -UN-29JAN90 upward. Both valves (B) must be closed and the piston (C) must be at the top of its compression stroke. If the valves are open, the piston is on the exhaust stroke and the M36282 flywheel must be turned one revolution. -UN-29JAN90 M36283 M98,2015K,32 -19-08OCT85 15 15