NOTE All valve guides are replaced the same. This procedure covers typical valve guides. REMOVAL Press valve guides (1) from bottom of cylinder head (2) to drive them out the top of cylinder head (2). INSTALLATION CAUTION Valve guide must be installed perpendicular to cylinder head to prevent damage to cylinder head. 1. Position and tap new valve guides (1) into cylinder head (2) until the top surface of the valve guides (1) protrude 0.886-0.926 in. (22.5-23.5 mm) above the cylinder head. 2. Press valve guides (1) into cylinder head (2). 3. Apply lubricating oil to valve guides (1). NOTE Intake and exhaust valves are different sizes. Use appropriate valve when performing step 4. 4. Using new valves (3), check if valve guides (1) allow for proper travel smooth insertion of valves (3). REAMING CAUTION Improper reaming of valve guide may result in damage to cylinder head. Ensure valve guide reamer is in proper alignment before work begins. 1. Using reamer, remove material from valve guides (1) to allow proper travel of valves (3). WARNING Compressed air source will not exceed 30 psi (207 kPa). When cleaning with compressed air, eye protection must be worn. Failure to do so may result in injury to personnel 2. Clear debris from valve guides (1) and cylinder head (2) with compressed air. INSPECTION 1. Use bore gauge and check inner diameter of valve guides (1) for the following dimensions: a. 0.3181 in. (8.080 mm) maximum. b. 0.3163-0.3171 in. (8.035-8.055 mm) miminum. 2. Replace valve guide(s) (1) if they do not conform to these requirements. 3. Install valves (WP 0355 00). 0357 00-2 TM 9-2320-386-24-1-2 0357 00 VALVE GUIDE MAINTENANCE (Contd)