The flowmeter (9) is calibrated to an altitude of 600 feet (183 m) above sea level; flowmeter
readings must be corrected to the ambient altitude as follows: at sea level, add 0.012 units to
the flowmeter reading; for every 500 feet (152 m) of altitude rise above 600 feet (183 m),
subtract 0.1 unit. If the testing is being conducted at 2100 feet (640 m), for example, find the
number of flowmeter units to subtract as follows:
2100-600 x 0.1 = 0.3 units
0.3 = corrected flowmeter reading
Rotate the injector plunger in small increments until the highest reading is obtained on the flowmeter. (A
zero reading on the flowmeter indicates no leakage.)
The corrected flowmeter reading shall not exceed 4.5for injectors. If the flow rate exceeds these limits,
replace the plunger (3, Figure 6-21) and barrel (15) as a matched set.
Before proceeding to the next test, or removing the injector, turn the tip seat plunger leakage valve (12,
Figure 6-18) to OFF, then turn the air supply valve (11) to OFF.
Check ball leakage test.
If removed, install the injector in the test stand in accordance with step (1), above.
Adjust the hand crank (8) in accordance with step (3) (c) and (d), above.
Turn the check ball leakage valve (13) to ON, then turn the air supply valve (11) to ON.
Adjust the air supply regulator knob (3) to obtain 80 psi (552 kPa).
Observe and correct the flowmeter reading in accordance with step (3), above.
If the corrected flowmeter reading exceeds 10.0 units, replace the check ball (13, Figure 6-21), the plunger
and barrel set (3 and 15), or both the check ball and plunger and barrel set as necessary.
When all leakage tests have been passed, remove the injector from the test stand, and proceed to the flow
Flow Test Flow testing is conducted using injector test stand and calibration kit 3375410. All necessary tools
and equipment used in the following steps are included in the kit; this includes the test stand 3375317 (Figure 6-
20). The general test room requirements should be in accordance with step a, above. In addition, the ambient
room temperature should be maintained between 60 to 90DF (15 to 320C), and the cooling water must be
supplied at a pressure above 40 psi (276 kPa), and a temperature below 800F (270C), Check the fuel tank (10,
Figure 6-20) level daily at the sight gage (15). I necessary, add calibration fluid 3375365 to bring the level to
approximately 0.5 inch (13 mm) below the top of the sight gage. To ensure accuracy, the test stand must be
maintained and calibrated periodically in accordance with the applicable service directive. Flow test the injectors
Turn the main switch on the tester control panel (4) to ON.
Press the fuel system ON button on the control panel (4) to activate the fuel tank heater (11).
Check the cam box (7) to be sure the proper cam is installed; a chart on the underside of the cam storage
box (9) lists the proper cam to be used for the injector being tested. N necessary, change the cam as
Remove the cam box lid (8, Figure 6-24), and rotate the tappet (2) away from the camshaft (5) using
the box wrench (9) provided.
Remove the cam nut and washer (7), and cam (6) using the box wrench (9).
Install the correct cam (6), and the cam nut and washer (7). Tighten the nut only until the camshaft (5)
begins to turn.
Rotate the tappet (2) against the cam, and replace the lid (8).