1A2 -- 12 GENERAL ENGINE INFORMATION
D AEW OO M Y_2000
Leakage Test
1. Warm the engine up to normal operating tempera-
ture.
2. Disconnect the negative battery cable.
3. Remove the spark plugs.
4. Check the coolant level by opening the coolant
surge tank cap and replenish if insufficient.
5. Open the engine oil filler cap.
6. Connect the tester to air pressure line and adjust the
scale of tester.
7. Install the connecting hose to spark plug hole.
YAA1A2080
8. Position the piston of No.1 cylinder at TDC by rotat-
ing the crankshaft.
9. Connect the connecting hose to tester and measure
the leakage volume after blowing up compressed
air.
Notice:Measure the leakage volume in the completely
opening condition of throttle valve by pulling the accel-
eration cable.
10. Perform the pressure test according to the firing or-
der.
Notice:Firing Order : 1 -- 3 -- 4 -- 2
11. Compare the leakage pressure with the specifica-
tions.
GENERAL ENGINE INFORMATION 1A2 -- 7
D AEW OO M Y_2000
DIAGNOSIS
OIL LEAK DIAGNOSIS
Most fluid oil leaks are easily located and repaired by
visually finding the leak and replacing or repairing the
necessary parts. On some occasions a fluid leak may be
difficult to locate or repair. The following procedures may
help you in locating and repairing most leaks.
Finding the Leak
1. Identify the fluid. Determine whether it is engine oil,
automatic transmission fluid, power steering fluid,
etc.
2. Identify where the fluid is leaking from.
2.1 After running the vehicle at normal operating
temperature, park the vehicle over a large sheet
of paper.
2.2 Wait a few minutes.
2.3 You should be able to find the approximate loca-
tion of the leak by the drippings on the paper.
3. Visually check around the suspected component.
Check around all the gasket mating surfaces for
leaks. A mirror is useful for finding leaks in areas that
are hard to reach.
4. If the leak still cannot be found, it may be necessary
to clean the suspected area with a degreaser, steam
or spray solvent.
4.1 Clean the area well.
4.2 Dry the area.
4.3 Operate the vehicle for several miles at normal
operating temperature and varying speeds.
4.4 After operating the vehicle, visually check the
suspected component.
4.5 If you still cannot locate the leak, try using the
powder or black light and dye method.
Powder Method
1. Clean the suspected area.
2. Apply an aerosol-- type powder (such as foot powder)
to the suspected area.
3. Operate the vehicle under normal operating condi-
toins.
4. Visually inspect the suspected component. You
should be able to trace the leak path over the white
powder surface to the source.
Black Light and Dye Method
A dye and light kit is available for finding leaks, Refer to
the manufacturer ’s directions when using the kit.
1. Pour the specified amount of dye into the engine oil fill
tube.
2. Operate the vehicle normal operating conditions as
directed in the kit.
3. Direct the light toward the suspected area. The dyed
fluid willappear as a yellow path leading to the
source.
Repairing the Leak
Once the origin of the leak has been pinpointed and
traced back to its source, the cause of the leak must be
determined n order for it to be repaired properly. If a gas-
ket is replaced, but the sealing flange is bent, the new
gasket will not repair the leak. Thebent flange must be
repaired also. Before attempting to repair a leak, check
for the following conditions and correct them as they
may cause a leak.
Gaskets
DThe fluid level/pressure is too high.
DThe crankcase ventilation system is malfunctioning.
DThe fasteners are tightened improperly or the threads
are dirty or damaged.
DThe flanges or the sealing surface is warped.
DThere are scratches, burrs or other damage to the
sealing surface.
DThe gasket is damaged or worn.
DThere is cracking or porosity of the component.
DAn improper seal was used (where applicable).
Seals
DThe fluid level/pressure is too high.
DThe crankcase ventilation system is malfunctioning.
DThe seal bore is damaged (scratched, burred or
nicked).
DThe seal is damaged or worn.
DImproper installation is evident.
DThere are cracks in the components.
DThe shaft surface is scratched, nicked or damaged.
DA loose or worn bearing is causing excess seal wear.
M161 ENGINE MECHANICAL 1B2 -- 99
D AEW OO M Y_2000
OIL DIPSTICK GUIDE TUBE
1 Oil Dipstick Level Gauge
2 Oil Dipstick Guide Tube
3O--ring4 Bolt (M6 X 16, 1 piece)
9--11 NSm (80-- 97 lb-in) ....................
5 Clamp
Removal & Installation Procedure
1. Pull out the oil dipstick level gauge (1).
2. Unscrew the bolt (4) and remove the oil dipstick guide
tube (2).
Installation Notice
Tightening Torque
9--11NSm (80 -- 97 lb-in)
It is very hard to remove the oil dipstick guide tube
without special tool. If it is not necessary, do not re-
move the guide tube.
3. Installation should follow the removal procedure in
the reverse order.
4. Check for leaks by starting the engine.
1A3 -- 10 GENERAL ENGINE INFORMATION
D AEW OO M Y_2000
DIAGNOSIS
OIL LEAK DIAGNOSIS
Most fluid oil leaks are easily located and repaired by
visually finding the leak and replacing or repairing the
necessary parts. On some occasions a fluid leak may be
difficult to locate or repair. The following procedures may
help you in locating and repairing most leaks.
Finding the Leak
1. Identify the fluid. Determine whether it is engine oil,
automatic transmission fluid, power steering fluid,
etc.
2. Identify where the fluid is leaking from.
2.1 After running the vehicle at normal operating
temperature, park the vehicle over a large sheet
of paper.
2.2 Wait a few minutes.
2.3 You should be able to find the approximate loca-
tion of the leak by the drippings on the paper.
3. Visually check around the suspected component.
Check around all the gasket mating surfaces for
leaks. A mirror is useful for finding leaks in areas that
are hard to reach.
4. If the leak still cannot be found, it may be necessary
to clean the suspected area with a degreaser, steam
or spray solvent.
4.1 Clean the area well.
4.2 Dry the area.
4.3 Operate the vehicle for several miles at normal
operating temperature and varying speeds.
4.4 After operating the vehicle, visually check the
suspected component.
4.5 If you still cannot locate the leak, try using the
powder or black light and dye method.
Powder Method
1. Clean the suspected area.
2. Apply an aerosol-- type powder (such as foot powder)
to the suspected area.
3. Operate the vehicle under normal operating condi-
tions.
4. Visually inspect the suspected component. You
should be able to trace the leak path over the white
powder surface to the source.
Black Light and Dye Method
A dye and light kit is available for finding leaks, Refer to
the manufacturer ’s directions when using the kit.
1. Pour the specified amount of dye into the engine oil fill
tube.
2. Operate the vehicle normal operating conditions as
directed in the kit.
3. Direct the light toward the suspected area. The dyed
fluid willappear as a yellow path leading to the
source.
Repairing the Leak
Once the origin of the leak has been pinpointed and
traced back to its source, the cause of the leak must be
determined n order for it to be repaired properly. If a gas-
ket is replaced, but the sealing flange is bent, the new
gasket will not repair the leak. Thebent flange must be
repaired also. Before attempting to repair a leak, check
for the following conditions and correct them as they
may cause a leak.
Gaskets
DThe fluid level/pressure is too high.
DThe crankcase ventilation system is malfunctioning.
DThe fasteners are tightened improperly or the threads
are dirty or damaged.
DThe flanges or the sealing surface is warped.
DThere are scratches, burrs or other damage to the
sealing surface.
DThe gasket is damaged or worn.
DThere is cracking or porosity of the component.
DAn improper seal was used (where applicable).
Seals
DThe fluid level/pressure is too high.
DThe crankcase ventilation system is malfunctioning.
DThe seal bore is damaged (scratched, burred or
nicked).
DThe seal is damaged or worn.
DImproper installation is evident.
DThere are cracks in the components.
DThe shaft surface is scratched, nicked or damaged.
DA loose or worn bearing is causing excess seal wear.
1A3 -- 14 GENERAL ENGINE INFORMATION
D AEW OO M Y_2000
Leakage Test
1. Run the engine to be the coolant temperature 80_C.
2. Remove the fuel injection nozzle.
3. Open the coolant subtank cap.
4. Check the coolant level and replenish if necessary.
5. Open the oil filler cap.
6. Remove the air cleaner cover and element.
7. Position the piston at TDC.
8. Install the connector (1) and connection piece (2).
9. Calibrate the tester and connect the connection
hose (3)
10. Pressurize with compressed air and compare the
pressure changes with permissible pressure leak-
age.
11. If permissible pressure leakage is out of standard,
check followings :
-- Intake and exhaust lines.
-- Sounds in oil filler area.
-- Air bubbles in radiator coolant.
12. Do pressure leakage test for the remaining cylinders
according to the firing order.
DOM 662LA Engine : 1-- 2-- 4-- 5-- 3
DOM 661LA Engine : 1-- 3-- 4-- 2
13. Remove the tester.
14. Close the coolant pressure cap and oil filler cap.
15. Install the air cleaner element and cover.
16. Install the fuel injection nozzle.
1B3 -- 92 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
24. Insert the new connecting rod bearing shells into the
connecting rod and connecting rod bearing cap and
tighten the 12--sided stretch bolts (11).
Tightening Torque40 N∙m (30 lb-ft) + 90_
25. Measure inner diameter of connecting rod bearing.
26. Measure connecting rod bearing journal diameter
(K).
Notice
Refer to measurement of the crankshaft bearing
journal diameter.
27. Measure the radial clearance (L) of the connecting
rod bearing.
Example) Measured value ’J’ = 47.700mm
Measured value ’K’ = 47.653mm
——————————————
Clearance ’L’ = 0.047mm
Radial Clearance ’L’0.026 -- 0.068mm
Notice
If the clearance is out of standard, adjust the radial
clearance of connecting rod bearing by replacing the
connecting rod bearing shells.
28. Remove the connecting rod bearing cap.
29. Install the piston.
30. Rotate the crankshaft by hand and check whether it
rotates smoothly.
31. If the bearings are damaged,
-- replace the oil presser relief valve.
-- clean the oil pump and oil filter housing carefully
and replace the hose if necessary.
Notice
After assembling the engine, check the camshaft
timing, adjust the start of fuel injection and check the
TDC sensor bracket setting.
32. Fill oil and run the engine and then check the oil
pressure and oil level.
Notice
Install the original oil filter element and then change
the engine oil and oil filter element after 1,000 --
1,500km.
1B3 -- 102 OM600 ENGINE MECHANICAL
D AEW OO M Y_2000
Checking
Notice
The noise which continues short time during short
travel (frequent starting of the engine) or engine
starting after a long time storage is normal operating
conditions. So, it does not need to be repaired. De-
termine the malfunctions in valve clearance com-
pensation device with noise through following tests.
If defective, replace as respectively.
1. Run the engine at more than 3000rpm for approx. 4
minutes.
2. Stop the engine. After 5minutes, check the engine
oil level and adjust if necessary.
3. Remove the cylinder head cover.
4. Check the valve tappets at TDC position of each cyl-
inders.
5. Using a drift, lightly press the valve tappet and mea-
sure clearance between the cam and valve tappet.
Notice
If the clearance exceeds 0.4mm, replace the valve
tappet.
6. If a valve tappet moves down too far in comparison
to the others, replace the valve tappet.
7. Rotate the engine and check the remaining valve
tappets.
Notice
DUnnecessary rotation of the engine will damage
the valve tappets.
DDo not rotate the engine by using the camshaft
sprocket bolt or to the opposite direction of the
engine rotation.
1F3 -- 40 OM600 ENGINE CONTROLS
D AEW OO M Y_2000
Tools Required
617 589 09 21 00 Rl Sensor
617589102100 TimingTester
667589002100 TDCPulseGenerator
Commercial Tools
ItemTools
Digigal TesterWith Pulse GeneratorBosch, MOT 001.03gg
Hartmann & Braun, EOMT3
Without Pulse GeneratorBosch, ETD 019.00
Sun, DIT 9000
ALV, Diesel -- Tester 875
Test Procedure
1. Remove the screw plug (7) and seal (8) collect oil in
a suitable vessel.
2. Install the Rl sensor into the governor housing of in-
jection pump (1).
Rl Sensor 617 589 10 21 00
3. Connect the digital tester and TDC pulse sender unit
according to connection diagram.
4. Run the engine at idle speed and check the Rl value
on the digital tester
Rl valueAT DC 1 4_-- 1 6_
Notice
If out of standard, adjust the start of delivery.
5. Stop the engine.
6. Remove the Rl sensor, digital tester and TDC pulse
sender unit.
7. Replace the seal and tighten the plug.
8. Check engine oil level and adjust if necessary.
Tightening Torque30 N∙m (22 lb-ft)