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INSTALLATION - TM-5-4210-229-14P_403
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TM-5-4210-229-14P Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Valve seat inserts installation
TM 5-4210-229-14&P 6-6. CYLINDER HEAD AND VALVES MAINTENANCE (Continued). j. Valve seat replacement. (1)   Remove  valve  seats  with  a  slide  hammer  and expanding    screw    with    pre-cup    puller.        Two pre-cup  pullers  are  available  for  service;  one  for intake, one for exhaust valves. Cleaning solvent (Appendix D, Item 54) is both toxic and flammable.  Keep off skin.  Use only in  a  well-ventilated  area  and  avoid  prolonged breathing   of   vapors.      Keep   away   from   open flames. (2)   Clean  counter  bore  (in  head)  to  assure  pro-per valve  seat  mating  and  good  heat  transfer.    Use cleaning solvent (Appendix D, Item54) and brass wire brush (Appendix D, Item7). (3)   If right fit is not assured between mating surfaces of   valve   seat   and   cylinder   head   counterbore, install oversize valve seat inserts as follows: (a)   Take    a    light    cut    from    bottom    in    insert counterbore  in  cylinder  head  to  dimensions shown below: OVERSIZE              INTAKE EXHAUST INSERT .002 in 1.998-1.999 in. 1.626-1.627 in. (50.75-50.77 mm) (41.30-41.33 mm) .015 in. 2.011-2.012 in. 1.639-1.640 in. (51.08-51.10 mm) (41.63-41.66 mm) (b)   Maintain radii shown when enlarging counterbore for oversize inserts. NOTE Chilling   will   prevent   metal   scraping   at counterbore, ensuring maximum contact of mating surfaces. (4) Valve seat inserts installation. (a) Chill valve set inserts and driver tool in dry ice  or  liquid  freon  for  one  half  hour  before installing. (b) Align insert to avoid cocking. (c) Press   insert   into   cylinder   head   using   an arbor   press   and   insert   driver.      Exert   an even  pressure  of  500  ft-lb  (2225  N.m)  for five seconds to assure proper seating. (d) Insert  should  be  recessed  into  head  when properly seated. k. Coat valve stems with clean engine oil (Appendix D, Item 36) prior to inserting them from the bottom of the head. 6- 11

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