1998 SSANGYONG MUSSO Workshop Repair Manual

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 Engine750 - 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

1F3-20 OM600 ENGINE CONTROLS
Tools Required
617 589 04 21 00 Tester
1. Disconnect the fuel line (2) from the fuel filter.
2. Remove the banjo bolt (4) from the fuel injection pump and
remove the seals (3) and fuel line (2).
3. Connect the tester (5).
4. Start the engine and read off the fuel pressure on tester
(5).
Notice
If out of standard, replace the fuel feed pump.
Tester 617 589 04 21 00
5. Stop the engine.At Idle Speed
At Full load
> 0.3bar
> 0.5bar
6. Remove the tester.
7. Replace the seal and connect the fuel line (2).

OM600 ENGINE CONTROLS 1F3-21
FUEL PUMP
1 Fuel Injection Pump
2 Pressure Line............................................13Nm
3 Suction Line
4 Hose Clip............................................... Replace5 Gasket ................................................... Replace
6 Spring Lock Washer
7 Hexagon Nuts
8 Fuel Pump

1F3-22 OM600 ENGINE CONTROLS
INJECTION NOZZLE TEST
Preceding Work : Removal of fuel injection nozzle
1. Fuel Injection Nozzle.............New : 115 - 125bar
Used : min. 100bar
A Closed Spray = good
B Stringy Spray = poor2 Tester
3 Valve

OM600 ENGINE CONTROLS 1F3-23
Tools Required
000 589 14 27 00 Tester
Notice
When testing the injection nozzle, do not place your hand into
the spray of a nozzle. The spray will penetrate deep into the
skin and destroy the tissue.
1. Connect the fuel injection nozzle to the tester (2).
Tester 000 589 14 27 00
2. Close the valve (3) and pump 5 times strongly.
3. Chatter test :
Slowly operate the hand lever at tester (approx. 1 stroke
per second). The nozzle must spray with a gentle chattering.
4. Spray pattern test :
Operate the hand lever at tester rapidly (approx. 2~3 strokes
per second).
lGood
The spray pattern shows closed and well atomized.
lPoor
The spray pattern shows split, too wide and stringy.
(Repair the fuel injection nozzle)