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Cylinder Head
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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inspection (cont) - TM-5-4210-220-34_210
TM 5-4210-220-34 2-19. ENGINE - Continued (5)     Lift head carefully from block.  Do not lay it flat bottom side down or drag it bottom side down. Lay it on 2 in. (50 mm) wood blocks to protect the cam followers and injector spray tips. (6)     Remove and discard the cylinder head compression gaskets (1), support shims (2), oil seals (3 and 4), and water seals (5). (7)     Drain  the  lubricating  oil  from  the  engine.    Draining  at  this  time  will  ensure  any  coolant  that  may  have contaminated the oil when the head(s) were removed is drained with the oil. INSPECTION NOTE If a service replacement head is to be installed, clean off all rust preventative compound before installing the pipe plugs.  Immerse the head in a bath of dry cleaning solvent (item 10, Appendix B) and scrub with a bristle brush.  Clean all passages using brush J8152 with an attached brass rod extension handle. A service replacement cylinder head includes the exhaust valve guides, valve seat inserts, water nozzles, injector tubes, pilot sleeves, valve bridge guides, valve spring seats and all necessary plugs, shims, studs, cover plates, gaskets, lockwashers, and nuts.  If complete disassembly of the cylinder head is necessary, remove the exhaust valves and injectors as detailed in para.  2-19.7 and para.  2-19.5 respectively. (1)     Steam clean the cylinder head; if the water passages are heavily coated with scale, remove all components including all pipe plugs, injector tubes and water nozzles and place head in an acid pickling bath until all scale is removed. 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 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. (2)     Clean   the   cylinder   head   components   with   dry   cleaning   solvent   (item   10,   Appendix   B)   and   dry   with compressed air. (3)     Before  a  cylinder  head  can  be  reused,  it  must  be  inspected  for  cracks.    Refer  to  para.    2-7  for  magnetic particle  and  fluorescent  and  non-fluorescent  methods.    The  head  can  also  be  checked  by  carrying  out  a pressure test with tool J28454. 2-215

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