Daewoo Musso. Manual - part 184

1F3-16  OM600 ENGINE CONTROLS

Idle Speed

750 - 850 rpm

720 - 820 rpm

Engine

OM661LA Engine

OM662LA Engine

Tools Required

667 589 00 21 00  TDC Pulse Generato

Commercial Tool

IDLE SPEED ADJUSTMENT

Service Data

e.g. Bosch, MOT 001.03

Sun, DIT 9000

Digital Tester

Adjustment Procedure

1. Connect the digital tester (1) and TDC pulse sender unit

(11).

2. Run the engine and warm up the coolant to 60~80°C.

TDC pulse generator 667 589 02 21 00

3. Disconnect the vacuum hose (4) from the PLA unit to check

idle speed with tester.

4. Check idle speed with tester.

Notice

To adjust idle speed, loosen the locking nut (6) of PLA unit.

OM 661LA Engine

750 - 850rpm

OM 662LA Engine

720 - 820rpm

OM600 ENGINE CONTROLS  1F3-17

6. After adjustment, tighten the locking nut and place the

position marking with different color of paint.

Notice

If there are no changes in idle speed with PLA unit
adjustment, perform the service at a BOSCH Service Center.

7. Connect the vacuum pump to the PLA vacuum unit and

build up vacuum approx. 500mbar. If engine rpm increases
by approx. 100rpm, It is normal.

Vacuum Pump 001 589 73 21 00

8. Connect the vacuum line (4).

9. Switch on all ancillaries and check the idle speed.

5. Ensure not to damage the idle spring in the governor and

adjust idle speed by turning the PLA unit (5) slowly.

Notice

Do not rotate the PLA unit over ½ turn from the position
marking. If do, idle spring in the governor will be severely
damaged.

Clockwise

Counterclockwise

RPM Decrease

RPM Increase

1F3-18  OM600 ENGINE CONTROLS

Min. volume

150cm for 30 seconds

FUEL PUMP TEST

Notice

Before test, replace the fuel filter cartridge and fuel prefilter.

Fuel Feed Test

1. Disconnect the fuel return line (1) and seal up it with plug.

2. Insert the plastic hose (5) and put the end into the measuring

beaker (6).

3. Disconnect the vacuum line (4) from vacuum unit (engine

stop) (5) and connect the vacuum pump (7) to the vacuum
unit.

4. To avoid the engine starting, build up vacuum (approx. 500

mbar).

5. Operate the starter motor for exactly 30 seconds and

measure fuel volume in the beaker.

3

OM600 ENGINE CONTROLS  1F3-19

Fuel Pressure Test