ENGINE 85 Fig. 8 Fig. 9 Fig. 10 Fig. 7 GRINDING OF VALVES 1 Clean removed valves. Remove oil deposit, carbon, etc. 2 Check valve for runout and damages Fig. 7. Valves with bent stem or burnt heads should be replaced. Noattempt shouldbemade tostraightenbent valves. 3 In case valve is free fromany defects other thanworn out seat, it can be re-machined on a valve grinding machine as follows a. Clamp valve on valve grindingmachine jaws as close as possible to valve head. b. Adjust grinding angle on graduated scale to achieve correct valve seat angle. c. Feedvalve slowly towards grindingwheel until wheel just touches valve head. Fig. 8. d. Grind at low feed until valve seat is just clean all around. e. Valve stemtip canbe ground to 0.5mmmaximumto clear pitting/wear on a valve grinder with suitable attachment. NOTE Following the grinding, valve head thickness should not be less than specified value.
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