Mityvac MV5535 Digital Diesel Compression Test Kit User Manual download pdf (Page 6)

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UNIT/OFF button. Press and hold the CLEAR button

for at least three (3) seconds to clear the memory and

return the current cylinder indication to cylinder 1.

9. Check to see that the proper unit of measure, PSI, BAR,

or KPA, is displayed in the lower left corner of the LCD.

If not, press the ON/UNIT/OFF button until the desired

unit of measure is indicated.

10. Connect the tester to the glow plug adapter installed in

cylinder 1.

11. While watching the gauge, crank the engine and count

the compression strokes by listening to one of the adja-

cent cylinders. Watch for the pressure to peak around

6 to 10 strokes, then stop cranking. Make note of the

number of strokes required to reach peak compression.

12. Press the pressure relief button on the side of the tester

to release the pressure.

13. Disconnect the gauge and remove the glow plug

adapter.

14. Install the glow plug adapter in cylinder 2, and recon

nect the tester.

15. Advance the cylinder number shown on the tester LCD

to 2 by pressing the CYLINDER button.

16. Repeat the compression test on cylinder 2 and all

remaining cylinders. Be sure to crank the engine the

same number of strokes for each cylinder, and to ad-

vance the cylinder number shown on the tester.

17. After completing the test on all cylinders, remove the

tester and adapter, and replace the glow plugs.

18. The peak compression value for each cylinder can be

viewed by scrolling through the cylinders using the CYL-

INDER button.

Testing with Injector Adapter

Prior to starting a compression test, consult manufacturer’s

speciﬁcations and/or appropriate service manual to deter-

mine whether the test should be performed while cranking

or running. Familiarize yourself with the proper speciﬁca

tions and any unique testing procedures, and follow the

recommended procedures for removing and installing the

injectors.

1. Put the vehicle in neutral or park, and set the parking

brake.

2. Thoroughly clean the area around each injector to elimi

nate any chance of dirt or contamination entering the

engine.

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. Turn on the compression tester by pressing the ON/

UNIT/OFF button. Press and hold the CLEAR button

for at least three (3) seconds to clear the memory and

return the current cylinder indication to cylinder 1.

8. Check to see that the proper unit of measure, PSI, BAR,

or KPA, is displayed in the lower left corner of the LCD.

If not, press the ON/UNIT/OFF button until the desired

unit of measure is indicated.

9. Connect the tester to the injector adapter installed in

cylinder 1.

10. 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.

11. Press the pressure relief button on the side of the tester

to release the pressure.

12. Disconnect the gauge and remove the injector adapter.

If required, reinstall the injector before proceeding.

13. Install the injector adapter in cylinder 2, and reconnect

the tester.

14. Advance the cylinder number shown on the tester LCD

to 2 by pressing the CYLINDER button.

15. Repeat the compression test on cylinder 2 and all

remaining cylinders. Be sure to crank the engine the

same number of strokes for each cylinder, or to run the

engine for the same amount of time, and to advance the

cylinder number shown on the tester.

16. After completing the test on all cylinders, remove the

tester and adapter, and reinstall injector(s).

17. The peak compression value for each cylinder can be

viewed by scrolling through the cylinders using the

CYLINDER button.

18. Follow manufacturer’s instructions for analyzing the

results.

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Mityvac MV5535 Digital Diesel Compression Test Kit User Manual Page 6

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