If Inspection reveals excessive clearances, 0.03 mm (0.0012 in) or more, between the valves and the valve body bores, replace the entire valve body rather than attempt rework. If one or more valves are sticking from varnish deposits or burns resulting from deteriorated oil or overheating, you may be able to clean the valves and valve bodies. Always use crocus cloth, which is a very fine type of cutting material. Never use emery cloth, as it is too coarse and can scratch the valves or valve borest Scratches can lead to future deposds of varnish Or foreign matter. During cleaning, do not remove the sharp edges of the valve. When edges are rounded or scratched, entry is provided for dirt or foreign matter to work into the sides of the valves and hinder valve move- ment. The valves may be cleaned using alcohol or lacquer thinner. The valve bodies can be dip cleaned with a good carburetor cleaner or lacquer thinnert Do not leave valve bodies submerged in carburetor cleaner longer than five minutes, Rinse parts thoroughly and dry. Lubricate all parts in clean A.TtFt before reassemv bly. 1. Check valves for signs of burning. Replace if beyond clean-up. 2 Check all strainer for general condition. Fteplace if necessary. saraos Control Valve Body (Cont'd) 3. Check separator plate for scratches or damage. Replace if necessary. Scratches or score marks can cause oil to bypass correct oil passages and result in system malfunction. sATacv 4. Check all passages in upper and lower valve bodies for varnish deposits, scratches or other damage that would impair valve movement. C'heck threaded holes and related bolts and screws for stripped threads; replace as needed 5. Test valve springs for weakened load condition. Refer to Valve Body Spring Chart for spring specifications, ASSEMBLY 1. Reinstall the six steel balls in upper valve body. AT-27