TM 5-3810-300-24&P-3
2.1.4
FUEL INJECTOR TUBE
1. Place a new injector tube seal 'ring in the counterbore in
The bore in the cylinder head for the fuel injector is directly
the cylinder head.
through the cylinder head water jacket as shown in Fig. 1. To
prevent coolant from contacting the injector and still maintain
maximum cooling of the injector, a tube is pressed into the
2. Place the installer J 5286-4 in the injector tube. Then insert
injector bore. This tube is sealed at the top with a neoprene
the pilot J 5286-5 through the small opening of the injector
ring and upset into a flare on the lower side of the cylinder
tube and thread it into the tapped end of the installer (Fig. 2).
head to create water-tight and gas-tight joints at the top and
bottom.
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
Remove Injector Tube
of the injector tube. The tube flange is merely used to retain
the seal ring.
When removal of an injector tube is required, use injector tube
service tool set J 22525 as follows
4. With the injector tube properly positioned in the cylinder
head, upset (flare) the lower end of the injector tube as
1. Remove, disassemble and clean the cylinder head as
follows:
outlined in Section 1.2.
a. Turn the cylinder head bottom side up, remove the
2. Place the injector tube installer J 5286-4 in the injector
pilot J 5286-5 and thread the upsetting die J 5286-6
tube. Insert the pilot J 5286-5 through the small opening of
into the tapped end of the installer J 5286-4 (Fig. 3).
the injector tube and thread the pilot into the tapped hole in the
end of the installer (Fig. I).
b. Then, using a socket and torque wrench, apply
approximately 30 lb-ft (41 Nm) torque on the
3. Tap on the end of the pilot to loosen the injector tube.
upsetting die.
Then lift the injector tube, installer and pilot from the cylinder
head.
c. Remove the installing tools and ream the injector
tube as outlined below.
Install Injector Tube
Thoroughly clean the injector tube hole in the cylinder head to
remove dirt, burrs or foreign material that may prevent the tube
from seating at the lower end or sealing at the upper end.
Then install the tube as follows:
Fig. 2 - Installing Injector Tube
Fig. 1 - Removing Injector Tube
Page 179
