(36) so they can be installed in the same position and
removal tool in the injector tube; then thread the pilot
remove the valves.
into the end of removal tool, and remove the injector
tube as illustrated in figure 3-71.
Further disassembly of the cylinder head
(7) Exhaust valve guides. Support the cylinder
should only be done if inspection requires re-
head, bottom side up, on wooden blocks which are at
placement of valve guides, injector tubes,
least 3 inches thick. Remove the exhaust valve guide
valve seats, water nozzles, etc. If water jacket
as illustrated in figure 3-72.
is to be pressure tested, the injector tubes
(8) Exhaust valve seat insert. Place the cylinder
must not be removed.
head on its side and remove the exhaust valve seat in-
(6) Fuel injector tube. Place the injector tube
sert as illustrated in figure 3-73.
(9) Disassemble the cylinder head in numerical se-
quence illustrated in figure 3-74.
d. Cleaning and Inspection.
(a) Steam clean the cylinder head after all parts
have been removed.
(b) Immerse the cylinder head in solvent or fuel
oil then using a soft bristled brush remove all of the
rust proofing compound especially from the integral
(c) Dry the cylinder head using compressed air
to remove all solvent.
(2) Leak Test.
(a) Prepare the cylinder head for leak test by
sealing all water holes in the head with steel plates and
rubber gaskets as illustrated in figure 3-75.
(b) Install dummy or scrap injectors and tighten
injector clamp bolts to 20-25 lb-ft. torque.
(c) Drill and tap one of the end water hole covers
for an air hose connection as illustrated in figure 3-75
and apply 80 to 100 psi air pressure.
(d) Immerse the head in a tank of water previ-
ously heated to 180° to 200° F. for twenty minutes.