ELECTRONICS GP-ENGINE RATINGS 2054594 - Caterpillar

The valve clearance adjustment should be checked every 2000 service hours. To check the adjustment remove the carburetor and valve cover. The valve clearance check or adjustment should be made when the engine is hot. To check, crank the engine until the valve closes and the valve lifter is at its lowest position. To Adjust: Turn the adjusting screw until there is .008 inch (0.2 mm.) clearance at (2) between the adjusting screw and the end of the valve stem. Check this clearance with a thickness gauge (1).
STARTING ENGINE VALVE CLEARANCE ADJUSTMENT
1-Thickness gauge. 2-There should be .008 inch (0.2 mm.) clearance at this point.