centrally on the top of the bushing. Then place the
check valve cage over the check valve and against the
The former and new check valve and
check valve cage are not separately
interchangeable in a former injector
5. Insert the spring seat in the valve spring, then insert
the assembly into the spring cage, spring seat first.
a former injector if a new design
spray tip assembly is used.
6. Place the spring cage, spring seat and valve spring
assembly (valve spring down) on top of the check valve
When installing a new spray tip
assembly in a former injector, a new
valve spring seat must also be
installed. The current needle valve
has a shorter quill.
Fig. 43. Checking Injector Spray Tip Concentricity
7. Insert the needle valve, tapered end down, inside of
using Tool J 29584
the spray tip (Fig. 2). Then place the spray tip and
needle valve on top of the spring cage with the quill end
procedure when installing the seal ring with the new
of the needle valve in the hole in the spring cage.
8. Lubricate the threads in the injector nut and carefully
thread the nut on the injector body by hand. Rotate the
a. Place the new seal ring and protector in a
spray tip between your thumb and first finger while
container with a small amount of injector test oil.
threading the nut on the injector body (Fig. 40). Tighten
the nut as tight as possible by hand. At this point there
should be sufficient force on the spray tip to make it
Lubrication of the seal ring and
impossible to turn with your fingers.
protector is important to assure
proper installation of the seal ring.
9. Use socket J 4983-01 and a torque wrench to tighten
the injector nut to 75-85 lb-ft (102-115 Nm) torque (Fig.
b. Support the injector body, bottom end up, in
injector holding fixture J 22396.
10. After assembling a fuel injector, always check the
c. Place the lubricated protector over the threads
area between the nut and the body. If the seal is still
of the injector body. Place the new seal over
visible after the nut is assembled, try another nut which
the nose of the protector and down onto the
may allow assembly on the body without extruding the
shoulder of the injector body. Do not allow the.
seal and forcing it out of the body-nut crevice.
seal to roll or twist.
Do not exceed the specified torque.
d. Remove the protector.
Otherwise, the nut may be stretched
3. Install the spill deflector over the barrel of the
and result in improper sealing of the
lapped surfaces in a subsequent
Place the check valve (without the .010" hole)