DETROIT DIESEL 53
Injector Tube 2.1.4
Fig. 3 Upsetting Injector Tube
Fig. 4 - Reaming Injector Tube for Injector
Body Nut and Spray Tip
J 5286-6 into the tapped end of the installer J 5286-4 ( Fig. 3).
b. Then, using a socket and torque wrench, apply approximately 30 lb-ft torque on the upsetting die.
c. Remove the installing tools and ream the injector
tube as outlined below.
Ream Injector Tube
After an injector tube has been installed in a cylinder head, it must be finished in three operations: First, hand
reamed, as shown in Fig. 4, to receive the injector body nut and spray tip; second, spot-faced to remove
excess stock at the lower end of the injector tube; and third, hand reamed, as shown in Fig. 5, to provide a
good seating surface for the bevel or the lower end of the injector nut. Reaming must be done carefully and
without undue force or speed so as to avoid cutting through the thin wall of the injector tube.
The reamer should be turned in a clockwise direction only, both
when inserting and when withdrawing the reamer, because movement in the
opposite direction will dull the cutting edges of the flutes.
1. Ream the injector tube for the injector nut and spray tip. With the cylinder head right side up and the
injector tube free from dirt, proceed with the first reaming operation as follows:
a. Place a few drops of light cutting oil on the reamer flutes, then carefully position the reamer J 22525-1 in
the injector tube.
b. Turn the reamer in a clockwise direction (withdrawing the reamer frequently for removal of chips) until the
lower shoulder of the reamer contacts the injector tube ( Fig. 4). Clean out all of the chips.
Remove excess stock:
With the cylinder head bottom side up, insert the pilot of cutting tool J 5286-8 into the small hole
the injector tube.
Place a few drops of cutting oil on the tool. Then, using a socket and a speed handle, remove the excess
stock so that the lower end of the injector tube is from flush to .005" below the finished surface of the