Figure 11C-45. Reaming Injector Tube
for Body Nut and Spray Tip
Figure 11C-44. Upsetting Injector
Tube
B. Place a few drops of cutting oil on the
tool.
Then
using
a
socket
and
a
to provide a good seating surface for the
speed handle, remove the excess
bevel or the lower end of the injector
stock so that the lower end of the in-
nut. Reaming must be done carefully
jector tube is from flush to 0.005" be-
and without undue force or speed so as
to avoid cutting through the thin wall of
low
the
finished
surface
of
the
cylinder head.
the injector tube.
3. Ream the bevel seat in the injector
NOTE
tube:
The reamer should be turned in a
The tapered lower end of the injector
clockwise direction only, both
tube must provide a smooth and true seat
when inserting and when withdraw-
for the lower end of the injector nut to
ing the reamer, because movement
effectively seal the cylinder pressures
in the opposite direction will dull
and properly position the injector tip in
the cutting edge of the flutes.
the combustion chamber. Therefore, to
determine the amount of stock that must
be reamed from the bevel seat of the
1. Ream the injector tube for the injector
tube,
refer
to
on
page
nut and spray tip. With cylinder head
11C-27.
right side up and the injector tube free
from dirt, proceed with the first reaming
Install gauge J 25521 in injector tube.
o p e r a t i o n as follows:
Z e r o the sled gauge dial indicator J 22273
to the fire deck. Gauge J 25521 should
A. Place a few drops of light cutting oil
be flush to 0.014" with the fire deck of
on the reamer flutes, then carefully
the cylinder head (see Figure 11C-48 on
position the reamer J 22525-1 in the
injector tube.
B. T u r n t h e r e a m e r . i n a c l o c k w i s e d i r e c -
NOTE
tion (withdraw the reamer frequently
Any fire deck resurfacing work
for removal of chips) until the lower
must be done prior to final injector
shoulder of the reamer contacts the
tube gaging.
injector tube (Figure 11C-45). Clean
out all of the chips.
With the first reaming operation com -
2 . Remove excess stock:
pleted and the injector tube spot-faced,
wash the interior of the injector tube
A.
With the cylinder head bottom side
with clean solvent and dry it with com-
up, insert the pilot of cutting tool J
5286-8 into the small hole of the injec-
tor tube.
