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REPAIR - TM-5-4210-220-34_204
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Exhaust Valve And Valve Seat Regrind
TM 5-4210-220-34 2-19. ENGINE - Continued b. Exhaust Valve Bridge Guide Repair NOTE The     valve     bridge     guide     cannot     be repaired, replace as detailed following. If the guide is broken refer to instructions 6 thru 9 following. (1)    File    or    grind    two    diametrically    opposite notches 0.06 in.  (1.6 mm) deep in the side of the guide approximately 1.25 1.5 in.  (32 38 mm) from the upper end. (2) Place spacer J7091-3 over the guide. (3)     Slide guide remover J7091-5 over the guide and aline the set screws with the notches in the guide.  Tighten the set screws firmly. (4)     Place spacer J7091-4 over the guide remover and thread the nut on the remover. Turn it clockwise to withdraw the guide from the head. (5)     For installation of a valve bridge guide refer to step 10 following. (6)     To remove a broken exhaust valve bridge guide, drill a hole approximately 0.5 in. (13    mm)    deep    in    the end of the guide with a # 3, 0.213 in. (5.41 mm) drill bit. (7)     Tap the guide with 1/4 in.  - 28 bottoming tap. (8)     Thread remover J7453 into the guide and attach slide hammer J2619-01 to the tool. (9)     One or two sharp blows with the puller weight will remove the broken guide. (10)  Apply retaining compound (item 23, Appendix B) to the undercut end of the new valve bridge guide. (11)  Start the guide straight into the cylinder head. (12)  Place installer J7482 over the guide and drive it into place. The  installer  will  properly  position  the  guide  to the correct height in the cylinder head. c. Valve Seat Insert Repair (1)     Turn cylinder head bottom side up and support on wooden blocks. (2)     Use the cam operated valve insert puller J23479-35 and collet J23479-33 to remove the insert from the head. (3)  Clean the valve insert counter bore and the new valve seat insert. 2-211

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