Oil Leak Diagnosis; Finding The Leak; Powder Method; Black Light And Dye Method - Daewoo Nubira Owner's Manual

Step
20 Inspect the bearing clearances.
Are the bearing clearances more than the values
specified?
21 Replace the bearing, if necessary.
Is the repair complete?
22 Inspect the oil galleries.
Are the oil galleries cracked, porous, or plugged?
23 Repair or replace the engine block.
Is the repair complete?
24 Inspect the gallery plugs.
Are any of the gallery plugs missing or installed im-
properly?
25 Install plugs or repair, as necessary.
Is the repair complete?
26 Inspect the camshaft.
Is the camshaft worn or is there evidence of poor
machining?
27 Replace the camshaft.
Is the repair complete?

OIL LEAK DIAGNOSIS

Most fluid oil leaks are easily located and repaired by visu-
ally finding the leak and replacing or repairing the neces-
sary 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.
1) After running the vehicle at normal operating
temperature, park the vehicle over a large sheet
of paper.
2) Wait a few minutes.
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 neces-
sary to clean the suspected area with a degreaser,
steam or spray solvent.
DAEWOO V–121 BL4
Action
GENERAL ENGINE INFORMATION 1A – 3
Value(s)
Crankshaft Go to Step 21
0.005 mm
(0.0001 in.)
Connecting
Rod
0.0019–0.070
mm
(0.0007–0.0025
in.)
Go to Step 1
Go to Step 23
Go to Step 1
Go to Step 25
Go to Step 1
Go to Step 27
Go to Step 1
1) Thoroughly clean the area.
2) Dry the area.
3) Operate the vehicle for several miles at normal
operating temperature and varying speeds.
4) After operating the vehicle, visually check the
suspected component.
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 pow-
der) 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.
Yes No
Go to Step 22
Go to Step 24
Go to Step 26
System OK