Specifications

Instructions 77-9045 Bacharach, Inc. Page 2-1
CD3 AUDIT KIT CUMMINS INJECTORS
2.0 CUMMINS INJECTORS
This section describes procedures designed to
adjust the CD3 for accurate testing of Cummins
injectors. These procedures must be performed in
the sequence listed here. After doing the viscosity
check (Section 2.2), complete the rest of the proce-
dures while the fluid and the machine are warm.
While performing these procedures, be certain all
fluid connections for each test are intact.
2.1 CALIBRATOR RPM TEST
This test ensures that the injectors are driven at
the correct speed. Because the main motor is
synchronous, the speed of the camshaft depends
only on incoming power frequency and pulley ratio.
As long as the frequency is held to 60 Hz (or 50 Hz,
depending on the motor used), the speed will fall
within the prescribed range. If an injector is driven
at a speed lower than prescribed, its flow output
will increase because the absolute time for filling
the injector is increased. If the injector is driven at
a higher speed, its output will decrease.
Equipment Required
• Hand held digital tachometer, optical preferred
• Screwdriver (small stubby)
2.1.1 Using a Photo-Electric Tachometer
Set-up
1. Switch circuit breaker OFF.
2. Open the pulley cover.
NOTE: Older units use a sliding pulley
cover, which should be opened ½ inch.
3. Attach a small piece of reflective tape (usually
supplied with the tachometer) to the front
flywheel face so that it can be seen through the
perforated window.
NOTE: The white painted strip on the
flywheel can be used instead of the tape.
The painted strip can be viewed through
the perforated window.
4. Close pulley cover.