TM 9-2320-272-24-4 - JATONKAM35s HOME ON THE WEB

TM 9-2320-272-24-45-5. VALVE SEAT INSERTS MAINTENANCE (Contd)c. Counterboring1. Clamp base (2) of counterbore cutter (7) to cylinder head (3) near valve insert seat bore (4). Ensurecounterbore cutter (7) is securely clamped before starting electric drill motor (1).NOTEAllow cutter to turn several revolutions at exact moment theproper depth in cylinder head is reached to ensure a perfectly flatbottom of bore for valve seats to seat.2. Center counterbore cutter (7) in valve seat insert bore (4) and valve guide mandrel (6).3. Cut counterbore (5) 0.006-0.010 in. (0.1524-0.2540 mm) deeper than valve seat insert thickness toallow staking (peening) of cylinder head (3) to secure valve seat insert.Eyeshields must be worn when cleaning with compressed air.Compressed air source will not exceed 30 psi (207 kPa). Failure todo so may result in injury to personnel.1. Blow cylinder head (3) out with compressed air.WARNINGDrycleaning solvent is flammable and toxic. Do not use near openflame and always have a fire extinguisher nearby when solventsare used. Use only in well-ventilated places, wear protectiveclothing, and dispose of cleaning rags in approved container.Failure to do this may result in injury or death to personnel and/ordamage to equipment.2. Clean opening and ports of cylinder head (3) with brush and drycleaning solvent.3. Dry cylinder head (3) with compressed air.e. InstallationCAUTIONValve seat inserts may be installed one time only. If valve seatinsert is not properly installed the first time, a new valve seatinsert must be installed.NOTEKeep valve seat inserts in cold storage until ready to install incylinder head. Install valve seat insert very quickly so roomtemperature does not have a chance to expand insert and make itdifficult to install.1. Drive valve seat insert (9) into valve seat insert bore (4) with valve seat insert tool until fully seated.2. Stake (peen) valve seat insert (10) into cylinder head (3) with valve seat insert tool and valve seatinsert staking tool.5-24