ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
FIGURE 3-90. Installing Pilot Tube Seal (Typical)
3-27.7.1 Special Test Bench Requirements.
Any test is only as good as testing equipment employed. Incorporation of quality test equipment and adherence to
specifications and following test procedures will reduce testing inaccuracies to a minimum.
A calibrating nozzle is required to test pump. Be sure to use only type nozzle called for in TABLE 3-4. Use of
SAE/150 or if ice plate nozzle is described in SAE recommended practices J968C and J969B.
Refer to TABLE 3-4 for length and ID of injection lines.
Guidelines for calibrating oil are listed in SAE Recommended Practice J969b. Oil should be changed every
three months or after testing 200 pumps, whichever comes first. Oil temperature in test bench must be
maintained within 110 to 115°F (43.3 to 46.1 °C). Temperature reading should be taken as close to inlet as
possible. Test bench should be equipped to maintain this temperature.
Test bench coupling should be of self-aligning, zero backlash type. Install drive hub (67-3303). Mount and drive
injection pump in accordance with test bench manufacturer's instructions.
3-27.7.2 General Test Procedure.
Install applicable transfer pump inlet connector, using two wrenches so pump outlet fitting does not get moved at
Remove locking screw (2, FIGURE 3-52), retaining plate (3), and screw (4). Install transfer pressure gage
connector (21900). Install a shutoff valve to isolate gage when not in use. Connect a pressure gage to shutoff
Remove timing line cover and install cam movement readout device (23745).
Rotation is clockwise when viewed from drive end.
Energize electric shutoff device with 24 VDC at lowest speed. Move pump throttle lever to full load position.
When transfer pump is primed, allow fuel to bleed for several seconds from loosened injection line nuts at
nozzles. After bleeding, tighten nuts securely.