DETROIT DIESEL 53
FUEL INJECTOR TUBE
The bore in the cylinder head for the fuel injector is
directly through the cylinder head water jacket as shown
in Fig. 1. To prevent cooling water from contacting the
injector and still maintain maximum cooling of the
Injector, a tube is pressed into the injector bore. This
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 top and
Remove Injector Tube
When removal of an Injector tube is required, use
injector tube service tool set J 22525 as follows:
1. Remove, disassemble and clean the cylinder head
as outlined in Section 1.2
2. Place the Injector tube Installer J 52864 in the
Fig. 2. - Installing Injector Tube
injector tube. Insert the pilot J 5286-5 through the small
opening of the injector tube and thread the pilot into the
sealing at the upper end.
Then install the tube as
tapped hole in the end of the installer (Fig. 1.).
3. Tap on the end of the pilot to loosen the injector
1. Place a new injector tube seal ring in the couterbore
tube. Then, lift the injector tube, installer and pilot from
in the cylinder head.
the cylinder head.
2. Place the installer J 52864 in the injector tube.
Install Injector Tube
Then, insert the pilot J 5286-5 through the small opening
of the injector tube and thread it into the tapped end of
Thoroughly clean the injector tube hole in the cylinder
the installer (Fig. 2.).
head to remove dirt, burrs or foreign material that may
prevent the tube from seating at the lower end or
3. Slip the injector tube into the injector bore and drive
it in place as shown in Fig. 2. Sealing is accomplished
between the head counterbore (inside diameter) and
outside diameter of the injector tube. The tube flange is
merely used to retain the seal ring.
4. With the injector tube properly positioned in the
cylinder head, upset (flare) the lower end of the injector
tube as follows:
Turn the cylinder head bottom side up, remove
the pilot J 5286-5 and thread the upsetting die J
5286-6 into the tapped end of the installer J
52864 (Fig. 3.).
Then, using a socket and torque wrench, apply
approximately 30 Ib-ft torque on the upsetting
Fig. 1. - Removing Injector Tube
Remove the installing tools and ream the
injector tube as outlined below.
1970 General Motors Corp.
SEC. 2.1.4 Page 1