DETROIT DIESEL 53
Fuel Injector 2.1.1
Fuel Injector 2.1.1 in the engine. Replace the filters
with the outgoing air. Also provide a source for 110 volt
only at the time of complete disassembly and assembly
alternating current electric power.
of an injector.
Provide the injector repair room with a supply of filtered,
NOTE: In the offset injector, a filter is
moisture-proof compressed air for drying the injector
used in the inlet side only. No filter is
parts after they have been cleaned. Use wash pans of
required on the outlet side (Fig. 34).
rust-proof material and deep enough to permit all of the
injector parts to be completely covered by the cleaning
Whenever an injector has been removed and
agent, usually clean fuel oil, when submerged in wire
reinstalled or replaced in an engine, make the following
baskets of 16 mesh wire screen. Use baskets which will
adjustments as outlined in Section 14:
support the parts so as to avoid contact with the dirt
which settles at the bottom of the pans.
a. Time the injector.
b. Position the injector control rack.
Rags should never be used for cleaning injector parts
since lint or other particles will clog parts of the injector
4. Whenever an engine is to be out of service for
when it is assembled. A lint-free cleaning tissue is a
an extended period, purge the fuel system, then fill it
good, inexpensive material for wiping injector parts.
with a good grade of rust preventive (refer to Section
When servicing an injector,
instructions outlined below:
5. When a reconditioned injector is to be placed in
stock, fill it with injector test oil J 8130. Do not use fuel
Whenever the fuel pipes are removed from an
oil. Install shipping caps on both filter caps immediately
Injector, cover the filter caps with shipping caps to keep
after filling. Store the injector in an upright position to
dirt out of the injectors. Also protect the fuel pipes and
prevent test oil leakage.
fuel connectors from the entry of dirt or other foreign
NOTE: Make sure that new filters
reconditioned injector which is to be
After an injector has been operated in an
placed in stock. This precaution will
engine, do not remove the filter caps or filters while the
prevent dirt particles from entering
the injector due to a possible
reversal of fuel flow when installing
the injector in an engine other than
the original unit.
Clean and remove the valve rocker cover.
Remove the fuel pipes from both the injector
and the fuel connectors (Fig. 6.).
NOTE: Immediately after removal of the f uel.
Fig. 10. - Spray Pattern Test
Fig. 11.- Removing Injector Follower Stop Pin
1972 General Motors Corp.
SEC. 2.1.1 Page 5