DETROIT DIESEL 53
FUEL INJECTOR TUBE
The bore in the cylinder head for the fuel injector is
Install Injector Tube
directly through the cylinder head water jacket as
Thoroughly clean the injector tube hole in the cylinder
shown in Fig. 1. To prevent coolant from contacting
head to remove dirt, burrs or foreign material that
the injector and still maintain maximum cooling of the
may prevent the tube from seating at the Iower end or
injector, a tube is pressed into the injector bore. This
sealing at the upper end. Then install the tube as
tube is sealed at the top with a neoprene ring and
upset into a flare on the lower side of the cylinder
head to create water-tight and gas-tight joints at the
1. Place a new injector tube seal ring in the
top and bottom.
counterbore in the cylinder head.
2. Place the installer J 5286-4 in the injector tube.
Then insert the pilot J 5286-5 through the small
Remove Injector Tube
opening of the injector tube and thread it into the
tapped end of the installer (Fig. 2).
When removal of an injector tube is required, use
3. Slip the injector tube into the injector bore and
injector tube service tool set J 22525 as follows:
drive it in place as shown in Fig. 2. Sealing is
accomplished between the head counterbore (inside
1. Remove, disassemble and clean the cylinder head as
diameter) and outside diameter of the injector tube.
outlined in Section 1.2.
The tube flange is merely used to retain the seal ring.
2. Place the injector tube installer J 5286-4 in the
4. With the injector tube properly positioned in the
injector tube. Insert the pilot J 5286-5 through the
cylinder head, upset (flare) the lower end of the
injector tube as follows:
small opening of the injector tube and thread the pilot
into the tapped hole in the end of the installer
a. Turn the cylinder head bottom side up, remove the
pilot J 5286-5 and thread the upsetting die
3. Tap on the end of the pilot to loosen the injector
tube. Then lift the injector tube, installer and pilot
from the cylinder head.
Fig. 2 - Installing lnjector Tube
Fig. 1 - Removing Injector Tube
SEC. 2.1.4 Page 1