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