01-9751 Removing and installing, testing oil separator
1 Clip | 8 Nm. |
2 O-ring | replace. |
3 Oil separator | control range: +10 to -100 mm water column. |
4 Clip | |
5 Hose |
Shop-made tool
1 Attach a plastic hose (inner diameter 20 mm, length approx. 2000 mm) in a U-shape to a board.
2 Mark a scale in (mm) as shown in the drawing.
6 Attachment clip
7 Plastic hose
8 Dipstick guide tube
Removal, installation
1 Slacken clip (4) and pull off hose (5) at oil separator (3).
2 Slacken clip (1) and take oil separator (3) off the crankcase.
Installation note
Replace O-ring on oil separator.
Tighten clip (1), 8 Nm.
3 Install in the reverse order.
Note
Do not damage oil separator when performing maintenance and repair work. Even minor damage can cause failure of the oil separator. A damaged oil separator must always be replaced. If there is a repeated engine leak or engine oil in the intake system, test oil separator.
Testing
1 Park vehicle on level ground. The engine must be at normal operating temperature. Check oil level, adjust to correct level if necessary.
2 Connect the suitably long end of the water gauge to the dipstick guide tube and fill the water gauge up to the "zero marking" with water.
3 Start engine and observe water level in the gauge.
4 An overpressure exists in the crankcase if the water column at the free hose end (left) is higher than at the connected hose end (right) (maximum +10 mm water column).
5 The correct value is indicated by the difference between the two water levels.
6 A vacuum exists in the crankcase if the water column at the connected hose end (right) is higher than at the free hose end (left) (maximum - 100 mm water column).
7 The correct value is indicated by the difference between the two water levels.
Note
The pressure in the crankcase must be between +10 mm water column (overpressure) and
-100 mm water column (vacuum) over the entire engine speed range.
The causes for the limits being exceeded may be:
If excessive vacuum: Remedy:
- Air intake opening to diaphragm blocked. - Clear air intake opening.
- Replace air intake hose.
- Diaphragm does not close because of - Replace oil separator.
excessive spring force, spring incorrectly
seated or diaphragm torn.
If excessive overpressure:
- Leaks at the connection points of the - Check that connection points are
oil separator to the intake manifold. correctly seated.
- Intake vacuum insufficient as a result of - Check air cleaner and intake
faulty air cleaner or leaking intake passages. passages up to turbocharger
(risk of dust damage).
- Sludging of oil separator in filter part as a - Clean oil separator, replace if
result of viscous, sticky oil. necessary.
Referenced documents
- ra00005010002x 0002 - General: Engine model designations Engines OM 441-443 LA, EURO I
- ra00005010004x 0004 - General: Special tools Engines OM 441-443 LA, EURO I
- ra00005010005x 0005 - General: Technical data Engines OM 441-443 LA, EURO I
- ra00005010010x 0010 - General: Tightening torques Engines OM 441-443 LA, EURO I
- ra00005010901x 0901 - Repair of tapped holes using Heli-Coil inserts Engines OM 441-443 LA, EURO I