TM 5-3895-383-24
Procedure A (6V6106 Dial Indicator)
Calibrate Injector (Fuel) Timing Fixture
(1) 6V6106 Dial Indicator. (2) 4C4716 Timing Fixture. (3)
1U8702 Injector Timing Block. (4) 1U6678 Calibration Fixture.
(A) Collet sleeve. (B) Bolt. (C) Locating pin.
Before a check or an adjustment of the Fuel Timing Dimension
can be made, the tooling must be calibrated as follows:
2.
Install the 9S8883 Contact Point [12.7 mm (.50 in)
excluding threads] on the dial indicator stem.
3.
Install 6V6106 Dial Indicator (1) in the collet of 4C4716
Timing Fixture (2).
4.
Put the dial indicator and timing fixture (2) on the
1U8702
Injector
Timing
Block
(3)
and
1U6678
Calibration Fixture (4) as shown. Make sure locating pin
(C) in left side of timing fixture (2) engages hole in
calibration fixture (4). Install bolt (B) on the right side
and tighten to secure timing fixture (2) firmly to
calibration fixture (4). The long pin of timing fixture (2)
must be in the hole located in the center of injector
timing block (3). The ends of the injector timing block
and surface of calibration fixture must be clean.
5.
Refer to the TMI (Technical Marketing Information)
Governor Bench Performance Data for the correct Fuel
Timing Dimension to use. Make a note of the specified
Fuel Timing Dimension. Now subtract the length of the
1U8702 Injector Timing Block (62.00 mm) from the
specified Fuel Timing Dimension. Make a note of the
result. Put a minus (-) sign in front of the result.
Now move the dial indicator in the collet until the pointers
indicate the result found above, using the negative or minus (-)
dial indicator scale (red numbers on the 6V6106 Dial Indicator).
Then tighten the collet and recheck the indicator reading (red
scale).
Example #1
NOTE:
This is only an example. Be sure to use the
correct Fuel Timing Dimension for the engine
being checked.
Fuel Timing Dimension (specification)
64.01 mm
Subtract Length of 1U8702 Injector
62.00 mm
Timing Block
------------------------
2.01 mm
The difference is 2.01 mm. Put a minus (-) sign in front of the
result (-2.01 mm). The dial indicator must be moved in the
collet so that the pointers indicate this value on the red minus
(-) or negative scale on the 6V6106 Dial Indicator while timing
fixture (2) is mounted securely on calibration fixture (4).
Fuel Timing Dimension
(5) Tappet. (6) Adjustment screw.
(7) Shoulder. (D) Fuel Timing Dimension.
6.
Make sure the top surfaces of injector tappet (5) and
shoulder (7) are clean and dry.
4C4716 Timing Fixture Installed
(1) 6V6106 Dial Indicator. (2) 4C4716 Timing Fixture.
(6) Adjustment screw. (8) Inlet manifold.
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