Mityvac MV5534 Analog Diesel Compression Tester - Manual (Page 4)

Page Number - 4 Form 822858
3. Run the engine to warm it to normal operating tempera-
ture.
4. If the test is to be performed while cranking, ensure the
battery has a full charge and/or connect a charger or
auxiliary battery.
5. Follow the manufacturer’s recommended procedure for
disabling the fuel supply and removing the injector(s).
6. Select the appropriate injector adapter and install it into
cylinder 1.
7. Connect the tester to the injector adapter installed in
cylinder 1.
8. While watching the gauge, crank or run the engine as
specified by the manufacturer. If cranking, count the
compression strokes by listening to one of the adjacent
cylinders. Watch for the pressure to peak around 6 to
10 strokes, then stop cranking. If running the engine,
note the length of running time until maximum pressure
is reached.
9. Record the cylinder number and its peak compression
value.
10. Press the pressure relief button on the side of the tester
to release the pressure.
11. Disconnect the gauge and remove the injector adapter.
If required, reinstall the injector before proceeding.
12. Install the injector adapter in cylinder 2, and reconnect
the tester.
13. Repeat the compression test on cylinder 2 and all
remaining cylinders. Be sure to crank the engine the
same number of strokes and to record the peak com-
pression value for each cylinder.
14. After completing the test on all cylinders, remove the
tester and adapter, and reinstall injector(s).
15. Follow manufacturers instructions for analyzing the
results.