Oil Leak Diagnosis

Oil Leak Diagnosis

^ Tools Required
- J 28428-E High Intensity Black Light Kit

You may repair most fluid leaks by first visually locating the leak, repairing or replacing the component, or by resealing the gasket surface. Once the leak is identified, determine the cause of the leak. Repair the leak and the cause of leak.

Locating and Identifying the Leak
Use the visual inspection method in order to determine if the leaking fluid is one of the following items:
^ Engine oil
^ Transmission fluid
^ Power steering fluid
^ Brake fluid
^ Some other fluid
^ Engine coolant
^ Fuel

Visual Inspection Method
Complete the following steps in order to perform the visual inspection method:

1. Bring the vehicle to normal operating temperature.
2. Park the vehicle over a large sheet of paper, or other clean surface.
3. Wait several minutes, then inspect for dripping fluids.
4. Identify the type of fluid, and the approximate location of the leak.
5. Visually inspect the suspected area. Use a small mirror if necessary.
6. Inspect for leaks at sealing surfaces, fittings, or from cracked or damaged components.
7. If you cannot locate the leak, perform the following steps:
1. Completely clean the entire engine and surrounding components.
2. Operate the vehicle for several miles at normal operation temperature and at varying speeds.
3. Park the vehicle over a large sheet of paper, or other clean surface.
4. Wait several minutes, then inspect for dripping fluids.
5. Identify the type of fluid, and the approximate location of the leak.
6. Visually inspect the suspected area. Use a small mirror if necessary.
8. If you still cannot locate the leak, use the powder method or the black light and dye method.


Powder Method
1. Completely clean the entire engine and surrounding components.
2. Apply an aerosol-type powder, baby powder, foot powder, etc., to the suspected area.
3. Operate the vehicle for several miles at normal operation temperature and at varying speeds.
4. Identify the type of fluid, and the approximate location of the leak, from the discolorations in the powder surface.
5. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to see areas.

Black Light and Dye Method
A dye and light kit is available for finding leaks.

1. Use the J 28428-E or the equivalent. Refer to the manufacturer's instructions when using the tool.
2. Visually inspect the suspected area. Use a small mirror if necessary.

Possible Causes for Leaks
Inspect the vehicle for the following conditions:
^ Higher than recommended fluid levels
^ Higher than recommended fluid pressures
^ Plugged or malfunctioning fluid filters or pressure bypass valves
^ Plugged or malfunctioning engine ventilation system
^ Improperly tightened or damaged fasteners
^ Cracked or porous components
^ Improper sealants or gaskets where required
^ Improper sealant or gasket installation
^ Damaged or worn gaskets or seals
^ Damaged or worn sealing surfaces