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TM5-4210-229-14&P
4-77. INJECTION NOZZLES REPLACEMENT
This task covers:
a. Removal
b. Installation
INITIAL SET-UP
Tools
General Mechanics Tool Kit
Fuel Line Nut Wrenches
Materials/Parts
Injection Nozzles (6688840C91)
General Safety Instructions
Engine OFF.
Transmission in (N) neutral.
Parking brake set.
Batteries disconnected.
REMOVAL
Cleaning solvent (Appendix D, Item 54)
is both toxic and flammable. Keep off
skin. Use only in a well ventilated area
and avoid prolonged breathing of va-
pors. Keep away from open flames.
a.
Before removing nozzle assemblies, clean
exterior of each nozzle assembly and the sur-
rounding area with solvent (Appendix D, Item
54) to prevent entry of dirt into engine when
nozzle assemblies are removed. Also, clean
all fuel line connections.
b.
Loosen connector nut (1) with a fuel line nut
wrench and remove fuel lines.
c.
Cap open ends of nozzles and fuel injection
lines to prevent entry of dirt.
d.
With all fuel lines removed, remove injection
nozzles by turning counterclockwise. Pull noz-
zle assembly with seal washer (2) from the en-
gine. If seal washer remains in nozzle bore,
remove with a suitable tool and discard.
e.
Place nozzle assemblies in a holding rack (3)
to prevent damage to tips as they are removed
from the heads. The fixture is stamped with
numbers corresponding to the cylinder num-
bering of the engine. Use of this fixture per-
mits replacing nozzles in their respective ports
in the cylinder heads. Assure tips and line
connections are capped (4).
f. With nozzle removed, cover the nozzle bore in the
cylinder head with protective caps.
4-91
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