2.1.4
Injector Tube
DETROIT DIESEL 53
Fig. 6 - Checking Location of Injector Spray
Tip Relative to Lower Surface of Cylinder Head
injector tube with trichlomethylene or clean fuel oil
and dry it with compressed air. Then perform the
second reaming operation as follows:
a. Place a few drops of cutting oil on the bevel seat
of the tube. Carefully lower the reamer J 5286-9
into the injector tube until it contacts the bevel
seat.
b. Make a trial cut by turning the reamer steadily
Fig. 5 - Reaming Injector Tube for Injector Nut
without applying any downward force on the
3. Ream the bevel seat in the injector tube:
reamer. Remove the reamer, blow out the chips
and look at the bevel seat to see what portion of
The tapered lower end of the injector tube must
the seat has been cut.
provide a smooth and true seat for the lower end of
c. Proceed carefully with the reaming operation,
the injector nut to effectively seal the cylinder
withdrawing the reamer occasionally to observe
pressures and properly position the injector tip in the
the reaming progress.
combustion chamber. Therefore, to determine the
amount of stock that must be reamed from the bevel
d. Remove the chips from the injector tube and,
seat of the tube, the injector assembly should be
using an injector as a gage, continue the reaming
installed in the tube and the relationship between the
operation until the shoulder of the spray tip is
numbered surface of the spray tip to the fire deck of
within the limits specified in Fig. 6. Then wash
the cylinder head noted (Fig. 6).
the interior of the injector tube with trichloroeth-
ylene or clean fuel oil and dry it with compressed
With the first reaming operation completed and the
injector tube spot-faced, wash the interior of the
air.
SEC. 2.1.4 Page 3
November, 1973
