RETAINER 3S2628 - Caterpillar

Check the valve clearance, adjust if necessary, every 1000 service hours with the engine stopped and the compression release in the RUN position. Turn the engine until the valve closes and the push rod is at its lowest point. To Adjust: Loosen the valve adjusting screw locknut (1), turn the adjusting screw (2) to allow the thickness gauge (3) to pass between the top of the valve stem and the end of the valve rocker at the correct clearance. Set the clearance for the inlet valves at .018 inch (.46 mm.) and for the exhaust valves at .030 inch (.76 mm.). Tighten the adjusting screw locknut and check the adjustment.
VALVE CLEARANCE ADJUSTMENT
1-Locknut. 2-Adjusting screw. 3-Thickness gauge.If adjustment is made with the engine stopped, turn the engine until the valve closes and the push rod is at its lowest point. Check Valve Rotators: Check the valve rotators with the engine running, after the valve clearance adjustment check has been made, to see if the valves rotate. The rotating of valves decreases carbon build up and uneven wear, thereby increasing the life of the valves. To check the rotation of the valves, observe the lines on the spring retainer. If the valves do not turn the valve rotators should be replaced. See your Caterpillar dealer.