TM 5-3810-300-24&P-3
Fig. 7 Measuring Relationship of Gage to Fire Deck of
Cylinder Head
compressed air. Then perform the second reaming operation
as follows:
a. Place a few drops of cutting oil on the bevel seat of
the tube. Carefully lower the reamer J 5286-9 into
the injector tube until it contacts the bevel seat.
Fig. 6 Measuring Relationship of Bevel Seat in Injector Tube
to Fire Deck of Cylinder Head
b. Make a trial cut by turning the reamer steadily without
applying any downward force on the reamer.
the injector nut to effectively seal the cylinder pressures and
Remove the reamer, blow out the chips and look at
properly position the injector tip in the combustion chamber.
the bevel seat to see what portion of the seat has
Therefore, to determine the amount of stock that must be
been cut.
reamed from the seat of the tube, refer to Fig. 6.
c. Proceed carefully with the reaming operation,
Install gage J 25521 in the injector tube. Zero the sled gage
withdrawing the reamer occasionally to observe the
dial. indicator J 22273 to the fire deck. Gage J 25521 should
reaming progress.
be flush to i.014"with the fire deck of the cylinder head (Fig.
d. Remove the chips from the injector tube and, using
gage J 25521, continue the reaming operation until
NOTE: Any fire deck re-surfacing work must
the shoulder of the spray tip is flush to .014"with the
be done prior to final injector tube seat
fire deck of the cylinder head as shown in Fig. 7.
gaging.
Then wash the interior of the injector tube with clean
solvent and dry it with compressed air.
With the first reaming operation completed and the injector
tube spot-faced, wash the interior of the injector tube with
clean solvent and dry it with
Page 181
