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INSTALLATION - TM-5-4210-220-12_303
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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REPAIR (cont) - TM-5-4210-220-12_305
TM 5-4210-220-12 4-15.  AUXILIARY POWER UNIT - Continued 4-15.8  Engine Intake and Exhaust Valves - Continued (22) Install   machine   screws   (1)   together   with engine lift bracket(s) and tighten to 25 ft lb (34 Nm). (23) Install   oil   breather   cover   (6)   and   ether start plug (3). (24) Install left hand and right hand shrouds as detailed  in  para.  4-15.9  INSTALLATION steps 7 thru 11. (25) Install  engine  on  base,  see  para.  4-15.1 ASSEMBLY    (26)  Install  engine  in  truck, see para. 4-15.1 INSTALLATION. REPAIR a.  Valve Guide Repair. (1) Remove cylinder head from engine and disassemble as detailed (2) If guides are worn they must be replaced with oversize guides. (3) Remove valve guide retaining rings. (4) Press guides out of cylinder head with a punch or using a suitable arbor and press. (5) Ream guide bores.  Do not use reamers more than 0.020 in. (0.5 mm) oversize. (6)  When  bore  is  true,  measure  bore  and  machine  replacement  oversize  guide  to  an  outside  diameter  of  0.0020  - 0.0024 in. (0.05 - 0.06 mm) in excess of bore. (7) Press in replacement guides and install retaining rings  (8) Install valves in guides and ensure valve movement is not restricted.  Ream internal diameter of guides as necessary. (9) Install cylinder head on engine as detailed in INSTALLATION preceding. b.  Valve Seat Repair. (1) Remove cylinder head from engine and disassemble as detailed in REMOVAL preceding. (2) If valve seats are severely worn they must be replaced. (3) Drill three or four 0.082 - 0.12 in. (2-3 mm) holes through valve seat. (4) Cut seat with chisel avoiding damage to seat housing. 4-166

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