Specifications

Page 3-6 Bacharach, Inc. Instructions 77-9045
DETROIT DIESEL INJECTORS CD3 AUDIT KIT
The recheck limits (as given by DDC) of Master
Injectors on any calibrator are ±2% of stamped
value. As an example, for the type 71 Master
Injector:
Stamped Add Correct Tolerance (2%)
Value Value
72.0 + 2.5 = 74.5 73.0 - 76.0
Therefore, for a type 71 Master injector stamped as
72.0, correct delivery value (fuel output) should be
73.0-76.0 mm³/str on a Bacharach CD3 Calibrator.
From the above it follows that when calibrating
and/or checking injectors in service it is necessary
to add the above numbers to the limits given by the
manufacturer. For example:
Injector N75 (part No. 522877) has limits for the
KM Calibrator of 75 - 80 mm³/str. On the CD3 it is
necessary to add 2.5. Therefore, the new limits are
77.5 - 82.5 mm³/str.
4. Compare the average obtained with the value
stamped on the master injectors. The readings
must be within ± 2% of the number stamped.
3.7 STROKE COUNT CHECK
The following test is a verification that each update
occurs after the prescribed number of (50 or 100)
strokes. It is based on the fact that the speed is at
its nominal 2000 RPM.
Skip this test if you have already done it for Cum-
mins injectors.
Equipment Required
• Stopwatch
Set-up
1. Remove the injector, push rod, and associated
accessories.
2. Set the STROKES selector to 100.
3. Push the START MAIN DRIVE button.
4. Push the START METER button.