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GENERAL ENGINE INFORMATION 1A1 -- 5
D AEW OO M Y_2000
PERFORMANCE CURVE
E32 ENGINE
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1A1 -- 6 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-
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.
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GENERAL ENGINE INFORMATION 1A1 -- 7
D AEW OO M Y_2000
ENGINE CRANKING AT THE FRONT OF CRANKSHAFT
Preceding Work: Removal of cooling fan
1 Vibration Damper Assembly
2 Crankshaft Pulley3Bolt 8.6±0.9 NSm ..........................
Notice
DRemove the negative ground cable before proceed-
ing the work.
DRotate the pulley in normal engine rotating direction
when cranking.
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1A1 -- 8 GENERAL ENGINE INFORMATION
D AEW OO M Y_2000
COMPRESSION PRESSURE TEST
1 Compression Pressure Tester
2 Diagram Sheet3 Adaptor
4 Sealing Cone
Standard Service Data
Compression Ratio10 : 1
Normal Engine Temperature80°C
Normal Compression PressureGeneralMin. 10 bar, Max. 14 barp
Fuel OptimizationMin. 6 bar, Max. 10 bar
Permissible Pressure Difference Between Individual
CylindersMax. 1.5 bar
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GENERAL ENGINE INFORMATION 1A1 -- 9
D AEW OO M Y_2000
Measuring Procedure
1. Warm the engine up to normal operating tempera-
ture.
2. Remove the spark plugs.
3. Place the diagram sheet to compression pressure
tester.
4. Connect the adaptor to compression pressure tester
and install it into the spark plug hole.
5. Crank the engine approx. eight revolutions by using
the start motor.6. Compare the measurements of compression pres-
sure tester with the specifications.
7. Measure the compression pressure of the other cylin-
ders in the same way.
8. If measured value is not within the specifications, per-
form the cylinder pressure leakage test.
Notice
DDischarge the combustion residues in the cylinders
before testing the compression pressure.
DApply the parking brake before cranking the engine.
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1A1 -- 10 GENERAL ENGINE INFORMATION
D AEW OO M Y_2000
CYLINDER PRESSURE LEAKAGE TEST
3 Engine Oil Filler Cap
4 Vibration Damper6 Cylinder Pressure Leakage Tester with
Connecting Hose
Permissible Pressure Leakage
At Whole EngineMax. 25 %
At Valve and Cylinder Head GasketMax. 10 %
At Piston and Piston RingMax. 20 %
Cylinder Number By Mark On Vibration Damper At TDC
TDC MarkOT (TDC)a(120°)b (240°)
Cylinder Number1, 62, 53, 4
Universal Tool
Cylinder Pressure Leakage TesterBosch, EFAW 210A
Sun, CLT 228
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GENERAL ENGINE INFORMATION 1A1 -- 11
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.
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:
FiringOrder:1--5--3--6--2--4
11. Compare the leakage pressure with the specifica-
tions.
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1A1 -- 12 GENERAL ENGINE INFORMATION
D AEW OO M Y_2000
GENERAL INFORMATION
CLEANLINESS AND CARE
An automobile engine is a combination of many ma-
chined, honed, polished and lapped surfaces with toler-
ances that are measured in the ten-thousandths of an
inch. When any internal engine parts are serviced, care
and cleanliness are important. A liberal coating of enigne
oil should be applied to friction areas during assembly, to
protect and lubricate the surfaces on initial operation.
Proper cleaning and protection of machined surfaces and
friction areas is part of the repair procedure. This is con-
sidered standard shop practice even if not specifically
stated.
Whenever valve train components are removed for ser-
vice, they should be kept in order. They should be
installed in the same locations, and with the same mating
surfaces, as when they were removed.
Battery cables should be disconnected before any major
work is performed on the engine. Failure to disconnectcables may result in damage to wire harness or other
electrical parts.
ON-ENGINE SERVICE
Caution: Disconnect the negative battery cable be -
fore removing or installing any electrical unit, or
when a tool or equipment could easily come in con-
tact with exposed electrical terminals. Disconnect -
ing this cable will help prevent personal injury and
damage to the vehicle. The ignition must also be in
LOCK unless otherwise noted.
Notice:Any time the air cleaner is removed, the intake
opening should be covered. Thiswill protect against ac-
cidental entrance of foreign material, which could follow
the intake passage into the cylinder and cause exten-
sive damage when the engine is started.