![]() Just like Mike I have a 17.5 HP Model 31C707 on a craftsman lawn tractor. NOTE: On some models, the nut and setscrew are positioned above the push rod ends. Check clearance again and re-adjust, if necessary. Hold rocker nut and tighten the rocker ball setscrew (B) to the torque valve of 45 lb-in. Using a feeler gauge (A, Figure 41), adjust rocker nut to obtain the clearance as listed on the bottom o this answer.Ĥ. Insert a narrow screwdriver or rod into the spark plug hole as a gauge, then slowly turn crankshaft counterclockwise until the piston has moved down the bore by 1/4” (6mm).ģ. This prevents the compression release from holding the valves open.Ģ. Turn crankshaft counterclockwise until piston is at top dead center on the compression stroke. NOTE: Check valve clearance while the engine is cold.ġ. :" Adjust Valve ClearanceĪll Models - Except Vertical Models 110000, 120000 Early Production O could probably provide you with a bit more in depth information, if I would know which engine model you have. Gump 01, here is a general idea about some of the B&S engines.
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