TM 5-3810-300-24&P-3
Injector Tube 2.1.4
NOTE: The reamer should be turned in a
clockwise direction only, both when inserting
and when withdrawing the reamer, because
movement in the opposite direction will dull
the cutting edges of the flutes.
1. Ream the injector tube for the injector nut and spray tip.
With the cylinder head right side up and the injector tube free
from dirt, proceed with the first reaming operation as follows:
a. Place a few drops of light cutting oil on the reamer
flutes, then carefully position the reamer J 22525-1 in
the injector tube.
b. Turn the reamer in a clockwise direction (withdrawing
the reamer frequently for removal of chips) until the
lower shoulder of the reamer contacts the injector
tube (Fig. 4). Clean out all of the chips.
Fig. 3 - Upsetting Injector Tube
2. Remove excess stock:
Ream Injector Tube
a. With the cylinder head bottom side up, insert the pilot
After an injector tube has been installed in a cylinder head, it
of cutting tool J 5286-8 into the small hole of the
must be finished in three operations: First, hand reamed, as
injector tube.
shown in Fig. 4, to receive the injector body nut and spray tip;
second, spot-faced to remove excess stock at the lower end of
b. Place a few drops. of cutting oil on the tool. Then,
the injector tube; and third, hand reamed, as shown in Fig. 5,
using a socket and a speed handle, remove the
to provide a good seating surface for the bevel or the lower
excess stock so that the lower end of the injector tube
end of the injector nut. Reaming must be done carefully and
is from flush to .005" below the finished surface of the
without undue force or speed so as to avoid cutting through
cylinder head.
the thin wall of the injector tube.
3. Ream the bevel seat in the injector tube: The tapered lower
end of the injector tube must provide a smooth and true seat
for the lower end of
Fig. 4 Reaming Injector Tube for Injector Body Nut and Spray
Fig. 5 - Reaming Injector Tube for Injector Nut
Tip
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