TM 5-3895-346-14
INJECTOR TUBE
ENGINE OVERHAUL
Figure 4.
Reaming Injector Tube for Injector
Figure 5. Reaming Injector Tube for Injector
Body Nut and Spray Tip
Nut
b. Place a few drops of cutting oil on the tool. Then, using a socket and a speed handle, remove the
excess stock so that the lower end of the injector tube is from flush to 0.005 inch below the finished surface of
the cylinder head.
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 the injector
nut to effectively seal the cylinder pressures and properly position the injector tip in the combustion chamber.
Therefore, to determine the amount of stock that must be reamed from the bevel seat of the tube, refer to Fig.
6.
Install gage J 25521 in the injector tube. Zero the sled gage dial indicator J 22273 to the fire deck. Gage J
25521 should be flush to 0.014 inch with the fire deck of the cylinder head (Fig. 7).
NOTE
Any fire deck resurfacing work must be done prior to final injector tube seat gaging. Refer to
Cylinder Head for resurfacing instructions.
With the first reaming operation completed and the injector tube spotfaced, wash the interior of the injector tube
with clean solvent and dry it
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