DETROIT DIESEL 53
Injector Tube 2.1.4
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
Make a trial cut by turning the reamer steadily
without applying any downward force on the
reamer. Remove the reamer, blow out the
chips, and look at the bevel seat to see what
portion of the seat has been cut.
Proceed carefully with the reaming operation,
withdrawing the reamer occasionally to observe
the reaming progress.
Remove the chips from the injector tube and,
using an injector as a gage, continue the
reaming operation until the shoulder of the spray
tip is flush to .015" recessed in the cylinder head
as shown in Fig. 6. Then, wash the interior of
the injector tube with trichloroethylene or clean
fuel oil and dry it with compressed air.
Fig. 5. - Reaming Injector Tube for Injector Nut
with Reamer J 5286-9
installed in the tube and the relationship between the
numbered surface of the spray tip to the fire deck of the
cylinder head noted (Fig. 6.).
With the first reaming operation completed and the
injector tube spot-faced, wash the interior of the injector
tube with trichloroethylene or clean fuel oil and dry it
Fig. 6. - Checking Location of Injector Spray
with compressed air. Then perform the second reaming
Tip Relative to Lower Surface of Cylinder Head
operation as follows:
1970 General Motors Corp.
SEC. 2.1.4 Page 3