Page 291 of 2053

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.
Page 313 of 2053
1B2 -- 20 M161 ENGINE MECHANICAL
D AEW OO M Y_2000
POLY V -- BELT
Preceding Work: Removal of cooling fan
1 Poly V-- belt (2,155 mm)
2 Belt Tensioning Pulley3 Belt Tensioner
Removal & Installation Procedure
1. Release the belt tension by turning the stud on the
cap with 12 sided wrench or spanner counterclock-
wise.
2. Remove the poly v -- belt.
Notice:Check the belt for damage and tensioning
pulley bearing point for wear and replace them if neces-
sary.
3. Install the belt after prying the tensioning pulley.
Page 317 of 2053
1B2 -- 24 M161 ENGINE MECHANICAL
D AEW OO M Y_2000
POLY V-- BELT INSPECTION
DMake marks on the belt with chalk.
DRotate the engine and check the belt for damage.
Notice:If one of the following types of damages is
found, replace the belt.
1. Rubber lumps in the base of rib.
2. Dirt or grit ingrained.
3. Pointed rib.
4. Belt cord visible in the base of rib.
5. Cord torn out at the side.
6. Outer cords frayed.
Page 320 of 2053
M161 ENGINE MECHANICAL 1B2 -- 27
D AEW OO M Y_2000
Removal & Installation Procedure
1. Remove the intake air duct.
Installation Notice
Tightening Torque
9--11NSm (80 -- 97 lb-in)
2. Remove the spark plug cover.
Installation Notice
Tightening Torque
9--11NSm (80 -- 97 lb-in)
Notice:Release 3 screws from the spark plug cover and
remove the cover for M161 Engine coil.
3. Remove the spark plug connector and ignition cable.
4. Unscrew the bolts (3) and remove the head cover and
the gasket.
Installation Notice
Tightening Torque
9--11NSm (80 -- 97 lb-in)
Notice:Replace the gasket with a new one if necessary.
5. Installation should follow the removal procedure in
the reverse order.
6. Check for oil leaks by operating the engine.
Page 326 of 2053
M161 ENGINE MECHANICAL 1B2 -- 33
D AEW OO M Y_2000
10. Remove the cylinder head bolts in the reverse order
of the numerics (No.10→No.1) using allen wrench
socket617589001000.
Installation Notice
Tighten the bolts as numerical order with specified
torque (No.1→No.10).
1st step: 55 NSm (41 lb-ft)
Tightening Torque2nd step: + 90°ggq
3rd step: + 90°
Notice:Operate during engine cooling.
11. Remove the No. 1 bearing cap of the exhaust cam-
shaft.
Installation Notice
Tightening Torque
22.5 -- 27.5 NSm
(16.6 -- 20.3 lb-ft)
12. Carefully remove the cylinder head.
13. Check the cylinder head mating surface and clean
the crankcase head bolt mounting hole.
14. Replace the cylinder head gasket with new one.
15. Check the length of the cylinder head bolt.
Installation Notice
Length(L)When New 100 mmLength(L)Max. Length 105 mm
Notice:Replace the bolt if the measured length exceed
the max. length.
16. Installation should follow the removal procedure in
the reverse order.
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1B2 -- 36 M161 ENGINE MECHANICAL
D AEW OO M Y_2000
8. Unscrew the bolts (A).
Installation Notice
Tightening Torque
22.5 -- 27.5 NSm
(16.6 -- 20.3 lb-ft)
9. Remove the belt pulley and vibration damper.
Installation Notice (Center Bolt)
Ti
ghteningTo rque
1st step: 200 + 20NSm
(148 + 15 lb-ft)
TighteningTorque
2nd step: 90°+10°
10. Unscrew the bolts (1, 2) on timing gear case cover
and remove the timing gear case cover.
Installation Notice
Tightening Torque
22.5 -- 27.5 NSm
(16.6 -- 20.3 lb-ft)
Notice:Be careful not to damage the cylinder head gas-
ket.
11. Remove the radial shaft seal.
Notice:Installation note replace the seal with new one.
12. Clean the timing gear case cover and crankcase
sealing surface.
13. Replace the O -- ring with new one and apply the
sealant on the sealing surface.
Notice:Be careful not to stain the oil chamber of chain
tensioner with the sealant.
14. Installation should follow the removal precedure in
the reverse order.
15. Warm up the engine and check for oil leaks.
Page 331 of 2053

1B2 -- 38 M161 ENGINE MECHANICAL
D AEW OO M Y_2000
Tools Required
601 589 03 43 00 Crankshaft Rear Seal Installer
Removal & Installation Procedure
1. Unscrew the bolts (1) and (5) and remove the closing
cover by pulling the rear cover lug (arrows).
Notice:Be careful not to damage the oil pan gasket.
2. Clean the sealing surface of the crankcase and the
rear sealing cover.
3. Check the radial shaft seal and replace it if necessary.
4. Apply the Loctite 573 to the rear cover sealing sur-
face.
5. Apply the engine oil to the dust lip of the radial shaft
seal.
Notice:Do not use the grease.
6. Install the crankshaft rear radial seal and the crank-
shaft sealing rear cover, using crankshaft rear seal in-
staller 601 589 03 43 00.
7. Install the crankshaft sealing rear cover mounting
bolts and remove the crankshaft rear seal installer
601 589 03 43 00.
Installation Notice
Tightening Torque
9--11NSm (80 -- 97 lb-in)
8. Installation should follow the removal procedure in
the reverse order.
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M161 ENGINE MECHANICAL 1B2 -- 43
D AEW OO M Y_2000
Tools Required
601 589 03 14 00 Crankshaft Front Seal Installer
Replacement Procedure
1. Remove the radial seal with a screw driver.
Notice:Use a clean cloth not to damage the radial seal
mounting hole and the crankshaft.
2. Coat the radial sealing lip with engine oil.
3. Using the crankshaft front seal installer 601 589 03 14
00, assemble the radial seal .
4. Align the sleeve groove and the woodruff key and
tighten the center bolt until the center bolt and the
damper disk stop in the movement.
Installation Notice
Ti
ghteningTo rque
1st step: 200 + 20 NSm
(148 + 15 lb-ft)
TighteningTorque
2nd step: 90°+10°
5. Remove the crankshaft front seal installer 601 589 03
14 00, and install the belt pulley and the vibration
damper.
6. Check for leaks while operating the engine.