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INSTALLATION - TM-5-4210-220-34_202
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR - TM-5-4210-220-34_204
TM 5-4210-220-34 2-19. ENGINE - Continued (7)     Thread the valve spring compressor J7455 into one of the rocker shaft bolt holes in the cylinder head. Compress  the  valve  spring  only  sufficiently  to  install  the  locks.    Excessive  compression  could  damage stem oil seals (10). (8)     Apply pressure to the tool arm to compress the spring.  Install the two-piece taper valve lock (6). (9)     Give the end of the valve stem a sharp tap with a plastic hammer to seat the locks. (10)  Using spring checking gage J25076-B, note the gage reading the moment the exhaust valve starts to open. The minimum pressure must not be less than 20 lb (9.1 kg). (11)  Repeat for all valves. (12)  When   complete   install   the   injector   rocker arms,    and  push  rods.    Install  the  cylinder head on the engine as detailed in para.  2- 19.8. (13)  Place   the   valve   bridge   (5)   in   a   vise   and loosen  the  locknut  on  the  bridge  adjusting screw. (14)  Install  the  valve  bridge  on  the  valve  bridge guide (11). (15)  While firmly pressing straight  down    on  the pallet  surface  of  the  valve  bridge,  turn  the adjusting     screw     clockwise     until     it     just touches the valve stem. (16)  Turn the screw an additional 1/8 to 1/4 turn clockwise and tighten the locknut fingertight. To avoid bending the bridge guide or rear valve stem, never loosen or tighten the locknut with the bridge on the engine. (17)  Remove the valve bridge, install in a vise and while holding the screw tighten the locknut to 25 ft lb (34 Nm). (18)  Lubricate the valve bridge and guide with engine oil (item 17, Appendix B) and install bridge on the guide. (19)  Place a 0.0015 in.  (0.038 mm) (feeler gage under each end of the valve bridge.  While pressing down firmly on the pallet surface, both feeler gages must be tight.  If not tight, readjust screw. (20)  Adjust all bridges similarly. 2-209

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