Page 617 of 1574
1F3-6 OM600 ENGINE CONTROLSTemperature measuring instrument with test probe WB24
Digital tester
Tools Required
001 589 73 21 00 Vacuum Pump
201 589 13 21 00 Vacuum Tester
667 589 00 21 00 TDC pulse generator
Commercial Tools
e.g. Bosch MOT 001.03
Sun DIT 9000
e.g. Ahlborn, Therm 2263-2
Eichenfeldstrabe 1 - 3D-8150 Holzkirchen
Tester Connection
11 TDC Pulse Sender Unit
12 Digital Tester
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OM600 ENGINE CONTROLS 1F3-7
Vacuum 500 mbar
Lines and connections leaking. Faulty PLA vacuum unit.
Test step 1
Connect vacuum pump (14) with Y adapter to PLA vacuum unit (5). Run engine at idle speed.YES NO
(Remove the connection hose from vacuum pump)
Connect vacuum pump (14) direct to PLA vacuum unit(5) and pressurize with vacuum.
Vacuum is built up and idle speed increases approx. 150-200 rpm
YES NO
Faulty PLA vacuum unit
(Coolant Temperature 30 °C)
Stop the engine Seal the air admission line with plug. Connect the vacuum pump to line to thermovalve andpressurize the line with vacuum.
Vacuum is built up.
YES NO
Lines and connectors leaking. Faulty thermovalve.
=
>
Page 619 of 1574
1F3-8 OM600 ENGINE CONTROLS
Detach line downstream of air admission filter (13).Vacuum drops.
Faulty thermovalve
Fit the line onto air admission filter. Built up vacuum with vacuum pump. Detach the plug from air admission line. Vacuum drops.
Faulty filter with restriction.
Go to test step 2.
YES
NO
YES NO
Page 620 of 1574
OM600 ENGINE CONTROLS 1F3-9
Test step 2
Connect vacuum pump (14) with Y adapter to PLA vacuum unit (5). Run the engine at idle speed.
Vacuum drops to ‘0’ at approx. 30 °C of the thermovalve.
Faulty thermovalve.
Defective filter with restriction.
Stop the engine. Detach the filter with restriction. Filter with restriction is clear.
Defective filter with restriction.
YES
NO
YES NO
Page 621 of 1574
OM600 ENGINE CONTROLS 1F3-11
VACUUM PUMP TEST
1 Fuel Filter
2 Vacuum Line3 Ancillaries Connection
4 Vacuum Tester
Tools Required
201 589 13 21 00 Vacuum Tester
Page 622 of 1574
1F3-12 OM600 ENGINE CONTROLS
Test Procedure
1. Remove the fuel filter (1) and keep the filter not to be damaged from running engine.
2. Remove the vacuum line (2) from ancillaries connection (3).
3. Connect the vacuum tester (4) to the ancillaries connection (3).
Vacuum Tester 201 589 13 21 00
4 Run the engine at idle and check vacuum pressure after 30 sec. Notice If out of standard, replace the vacuum pump.
5. Remove the vacuum tester.
6. Connect the vacuum line to the ancillaries connection.
7. Install the fuel filter.
Standard > 70 mbar
Page 623 of 1574
OM600 ENGINE CONTROLS 1F3-13
VACUUM PUMP Preceding Work : Remove the poly V-belt
1 Bolt............................................................ 10Nm
2 Vacuum Pump
3 Vacuum Line (Ancillaries) 4 Vacuum Line (Brake Booster)
5 Gasket ................................................... Replace
Page 624 of 1574
1F3-14 OM600 ENGINE CONTROLS
Removal & Installation Procedure
1. Remove the vacuum line (3, 4).
2. Remove the bolts (1) evenly. Notice
If necessary, rotate the engine until the pressure on the tappet of the vacuum pump is released.
3. Remove the vacuum pump (2).
4. Install the vacuum pump (2).
Tightening Torque 10 Nm
Notice Clean the gasket residues of sealing surface of vacuum pump and replace the gasket(5).
5. Connect the vacuum line (3, 4).