Injection Pump Vacuum Shutoff Test (DE-01.09)

Injection Pump Vacuum Shutoff Test (DE-01.09)

A. Without Tester
B. With Tester

Notes:
1. Vehicles with diaphragm vacuum pump. If engine oil is present in vacuum lines or brake booster, the diaphragm of the engine shutoff vacuum unit or the diaphragm in the vacuum pump can be defective.

If engine oil is visible at the vacuum line connection of the engine shutoff vacuum unit, replace vacuum unit and all vacuum lines contaminated with oil. Repair vacuum pump and replace brake booster if the vacuum line connections of these units show traces of oil.

If a defective vacuum pump diaphragm or a leaking engine shutoff vacuum unit causes engine oil to enter the combustion chambers via the air intake system, the combustion temperatures will increase, causing uncontrolled combustion, which may result in prechamber damage.

If the vacuum lines show an intense black coloring over their entire length, it can be assumed that engine oil entered the combustion chambers. In this case, it is advisable to inspect all prechambers.




Replace prechambers with cracks in tips (arrows) or burnt (scale covered) ball pin surface (arrow), otherwise, engine damage may result due to broken off prechamber particles.

2. The piston-type vacuum pump has been installed on the turbocharged diesel engines since the beginning of Model Year 1980 and on all naturally aspirated diesel engines since the beginning of Model Year 1981.


A. Without Tester

Test:

Test (cont):

B. With Tester

Test Values:

Color Coding:

Special Tool: