TM 10-3930-660-34 3-7. CYLINDER HEAD ASSEMBLY - REPLACE/REPAIR (Cont’d) 5. MACHINE PARENT METAL INTAKE VALVE SEAT POCKETS AND INSTALL INTAKE VALVE SERVICE SEAT(S). NOTE Valve seats marked with one X at side of cylinder head have been ground once and if regrinding is necessary, a service seat must be installed. a. Machine parent metal intake valve seat pocket to the dimensions shown. NOTE #3823031 Valve Seat Installation/ Staking Tool is available from Cummins Engine Co., Inc. for installing and staking valve seats. b. Using a driver, push service seats (15) into machined pockets. c. Using a suitable staking tool, stake service seals into seal pockets. NOTE Grind service seats for a few seconds only to avoid making them too wide. d. Grind service valve seats lightly to ensure proper seat angle. Seat Angle Intake: 30° Exhaust: 45° e. Install valves in their designated locations and measure depth I. Limit I Depth: 0.039 - 0.060 inch 3-45