CLEANING AND INSPECTION .WARNING. Skysol-100 mixture is combustible. Use mechanical ventilation whenever product is used in a confined space, is heated above ambient temperatures, or is agitated. DO NOT use or store near heat, sparks, flame, or other ignition sources. Keep container sealed when not in use. Contact with Skysol-100 may cause skin irritation. Use chemical resistant gloves. In case of skin contact, remove any contaminated clothing and wash skin thoroughly with soap and water. Wash contaminated clothing before reuse. Eye contact may cause irritation, tearing, or blurring of vision. Use face shield or goggles when eye contact may occur. In case of eye contact, flush eyes with large amounts of water for at least fifteen (15) minutes or until irritation subsides. Inhalation may cause irritation to upper respiratory passages. DO NOT have food or drink in the vicinity. 1. Clean valves (4) with Skysol-100 and dry with lint-free rag. 2. Clean and polish valves (4) with rag. 3. Inspect valves (4) for warpage, cracks, pits. burns, scoring, and galling. Mark for resurfacing if pitted, burned, or scored. Discard valve(s) if warped, cracked, or galled. NOTE Valve guides may be distorted during installation. 4. Use bore gauge to ensure inner diameter of valve guide (5) will allow proper travel of valve (4). If valve guide (5) inner diameter does not conform to the following, replace valve guide (5). a. 0.3181 in. (8.080 mm) maximum. b. 0.3163-0.3171 in. (8.035-8.055 mm) minimum. 5. Check keeper grooves (3) for wear. Replace valves (4) if damaged. 6. Inspect valve face (1) for scratches. Perform valve facing if damaged. 7. Inspect valve seat mating surface (2). If valve does not conform to the following specifications, perform valve facing, task c. a. Intake valve 29.00° - 29.50°. b. Exhaust valve 44.75° - 45.25°. 8. Inspect diameter of valve head. If valve (4) does not conform to the following specifications, replace valve (4). a. Intake valve 1.845-1.855 in. (46.86-47.12 mm). b. Exhaust valve 1.570-1.580 in. (39.88-40.13 mm). FACING CAUTION Ensure valve facing machine is in alignment before work begins. Facing valves with tooling out of alignment will result in damage to equipment. Grinder wheels are easily damaged. Working with damaged grinder wheels may result in damage to equipment. Inspect grinder wheels before grinding valves. NOTE Valves and valve seats that are correctly machined do not require the use of a lapping compound to make an air tight seal. 1. Grind valve face (1) to remove marks and scratches. 2. Grind valve seat mating surface (2) to the proper angle as follows: a. Intake valve 29.00° - 29.50°. 0355 00-4 TM 9-2320-386-24-1-2 0355 00 VALVE MAINTENANCE (Contd)