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INSPECTION - TM-5-4210-220-34_201
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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INSTALLATION (cont) - TM-5-4210-220-34_203
TM 5-4210-220-34 2-19. ENGINE - Continued 2-19.7    Exhaust Valves - Continued (9)     Clean  the  inside  of  the  valve  guides  with  brush  J5437  to  remove  all  gum  and  carbon  deposits  from  the guides.  Check the spiral grooves are clean. (10)  Inspect the valve guides for fractures, chipping, scoring, or excessive wear.  Measure the valve guide inside diameter with a pin gage or inside micrometer. (11)  Measure the outside diameter of the valve stems with a micrometer.  If the clearance exceeds 0.005 in.  (0.13 mm), replace valve guides as detailed in REPAIR following. (12)  Inspect  the  valve  seat  inserts  for  excessive  wear,  pitting,  cracking  or  an  improper  seat  angle.    The  proper angle for the seating face of the valve is 30 deg., and the angle for the insert is 31 deg.  If a valve seat has been reground to such an extent that the grinding wheel contacts the cylinder head, install a new insert. (13)  Check the contact area between the valve and valve seat by applying a light coat of Prussian Blue or similar paste onto the valve seat. (14)  Bounce the valve on the insert and check there is a line of contact around the whole seat. If not or the line is wavy repair the seats as detailed in REPAIR following. WARNING Dry  cleaning  solvent  P-D-680  (safety  or  Stoddard’s  solvent)  is  potentially  dangerous.    Avoid  repeated  and prolonged  breathing  of  vapors  and  skin  contact  with  the  liquid.    Do  not  use  near  open  flame,  arcing equipment or other ignition sources.  Always wear eye protection and protective clothing.  The flash point of P-D-680 is 100 to 138 deg.  F (30 to 59 deg.  C). (15)  Wash all components with dry cleaning solvent.  Be sure all contaminants are removed. INSTALLATION (1)     Check valve guides are totally clean.  Lubricate the valve stems with gear oil (item 15, Appendix B) and slide the valves into the guides.  Be sure valves are installed in same location as noted in step 12 of REMOVAL preceding. (2)     Hold  the  valves  in  place  with  a  piece  of  masking  tape  (item  18,  Appendix  B)  and  turn  cylinder  head  over. Place a board beneath the valves to hold them in place. (3)     Install valve spring seats (9). (4) If new oil seals (10) are being installed, place the plastic seal installation cap on the end of the valve stem.  If the cap extends more than 1/16 in.  (1.6 mm) below the groove on the valve stem, remove cap and cut off excess length. (5)    Lubricate  the  installation  cap  with  gear  oil  (item  15,  Appendix  B)  and  start  the  seal  carefully  over  the  valve stem.  Push the seal down slowly until the seal rests on top of the valve guide.  Remove the installation cap. (6)     Install the valve springs (8) over the guide and place spring caps (7) on top of spring. 2-208

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