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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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