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Exhaust Valve Removal
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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INSTALLATION - TM-5-4210-220-34_202
TM 5-4210-220-34 2-19. ENGINE - Continued (8)     Compress the valve spring and remove the two piece tapered valve lock (6). (9)     Release the tool and remove the spring cap (7), valve spring (8) and spring seat (9).  Repeat steps 6 thru 9 for each valve, as required. (10)  Turn the cylinder head over using care to keep the valves from falling out of the head. (11)  If the valves are to be reused, number each valve to facilitate reinstallation in the same location.  Withdraw the valves from the cylinder head. (12)  Remove the cam followers and push rod assemblies as required.  See para.  2-19.4. INSPECTION 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). Death or serious injury could occur if compressed air is directed against the skin.  Do not use compressed air for cleaning or drying unless the pressure is/has been reduced to 30 psi (2.11 kg/cm2) or less.  When working   with   compressed   air,   always   use   chip   guards   eye   protection   and   other   personal   protective equipment. (1)     Clean the springs with dry cleaning solvent (item 10, Appendix B) and dry them with compressed air.  Inspect springs for pitting or fractures.  Replace any damaged spring. (2)     Install each spring in spring tester J22738-02.  Replace  any  spring  which  compresses  to  less  than  1.80  in. (45.7 mm) with a load of 25 lb (11.3 kg). (3)     Inspect the valve spring seats and caps for wear.  Replace if worn. (4)     Examine the contact surfaces of the exhaust valve bridge guides, bridges and adjusting screws for wear and galling.  Replace excessively worn components. (5)     Inspect valve face and seats.  Black carbon deposits on the face could indicate blow-by due to a faulty seat. Deposits extending from the seats  to  the  valve  guides  may  result  from  cold  operation  due  to  light  loads  or using of too heavy a grade of fuel. (6)     Rusty brown valve heads with  carbon  deposits  forming  narrow  collars  near  the  valve  guides  is  evidence  of high temperature due to overloads, inadequate cooling or improper timing. (7)     Clean  the  valve  stems.    Inspect  for  scuff  marks  or  scratches.    The  valve  faces  must  be  free  from  ridges, cracks or pitting.  If necessary reface the valves or install new valves.  If valve heads are warped, replace the valves. (8)     If there is evidence of engine oil running down the exhaust valve stem into the exhaust chamber, creating a high oil consumption condition, replace the valve guide oil seals (see INSTALLATION following). 2-207

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