Engine: Testing and Inspection

11 15 510 Measuring the internal engine pressure (N55)

Special tools required:







Necessary preliminary tasks:
- Follow diagnosis instructions for pressure testing.
- Check engine oil level.







NOTE: Create tube 8x13 mm of length 70 mm.

Open oil filler cap.
Insert special tool 11 9 880 hand-tight into oil filler neck opening.
Connect low-pressure hose (2) with diagnosis connection of Integrated Measurement Interface Box and tube (1).

Connect tube (1) to special tool 11 9 880 .
Start engine and run at idle speed.
Order number for low-pressure hose: 81 38 2 201 924.
Order number for oil sealing cap: 83 30 0 496 326.







NOTE: The 25 bar sensor may optionally be used.

Open oil filler cap.
Insert special tool 11 9 880 hand-tight into oil filler neck opening.
Attach 25 bar pressure sensor (1) to special tool 11 9 880.
Start engine and run at idle speed.
Order number for oil sealing cap: 83 30 0 496 326.
Graphic N43.







Different fault patterns as example:
0,97 Bar Ambient pressure.
0,95 Bar Engine internal pressure normal.
If the deviation is significantly greater than -0.04 bar, the engine ventilation system is faulty.
0,80 Bar Pressure control valve faulty.
If the deviation is significantly greater than +0.04 bar, the engine ventilation system is clogged.
1,07 Bar Clogged ventilation system, e.g. iced up, contaminated or kinked vent line.