Diagnosis of oil leakage (A20NFT/LHU)
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Diagnosis of oil leakage (A20NFT/LHU)
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Stage
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Event
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Yes
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No
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DEFINITION: You can repair most of the fluid leakage by first visually locating the leak, repairing or replacing the component, or by resealing the gasket surface. When a leak has been identified then the cause of the leak must be established. Repair the cause of the leak as well as the leak itself.
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1
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2.
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Park the car on a level surface over a large sheet of paper or other clean surface.
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Is there any dripping?
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Go to
Step 2
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System OK
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2
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 3
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3
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1.
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Examine the suspected area visually. Use a small mirror to check areas that are difficult to see.
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2.
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Check for leaks in the following locations:
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Cracked or damaged components
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 4
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4
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1.
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Clean the whole engine and the adjacent components.
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2.
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Drive the car for several kilometres at normal operating temperature and at different speeds.
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3.
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Park the car on a level surface over a large sheet of paper or other clean surface.
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5.
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Identify the type of fluid and the approximate location of the leak.
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 5
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5
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1.
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Examine the suspected area visually. Use a small mirror to check areas that are difficult to see.
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2.
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Check for leaks in the following locations:
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Cracked or damaged components
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 6
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6
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1.
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Clean the whole engine and the adjacent components.
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2.
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Apply aerosol type powder e.g. baby powder or foot powder, on the suspected area.
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3.
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Drive the car for several kilometres at normal operating temperature and at different speeds.
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4.
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Identify the type of fluid and the approximate location of the leak by means of the stains in the powder.
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 7
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7
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1.
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Examine the suspected area visually. Use a small mirror to check areas that are difficult to see.
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2.
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Check for leaks in the following locations:
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Cracked or damaged components
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 8
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8
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Use a J 28428-E UV light kit to identify the type of fluid and the approximate location of the leak. Refer to the manufacturer's instructions when using the tool.
Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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Go to
Step 9
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9
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1.
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Examine the suspected area visually. Use a small mirror to check areas that are difficult to see.
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2.
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Check for leaks in the following locations:
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Cracked or damaged components
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Can you identify the type of fluid and the approximate location of the leak?
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Go to
Step 10
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System OK
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10
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1.
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Check for mechanical damage to the engine. Examine the following areas in particular detail:
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Fluid levels that are higher than recommended
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Pressure that is higher than recommended
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Fluid filters or pressure bypass valves that do not work or are clogged
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Engine ventilation system that does not work or is clogged
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Incorrectly tightened or damaged fasteners
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Cracked or porous components
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Defective sealing compounds or gaskets where required
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Defective sealing compound or incorrectly fitted gasket
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Damaged or worn gaskets or seals
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Damaged or worn sealing surfaces
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2.
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Check if the customer has made any modifications to the engine.
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Is there any mechanical damage or modifications made by the customer to the engine?
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Go to
Step 11
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System OK
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11
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Repair or replace all damaged or modified components.
Have you replaced all damaged or modified components if needed?
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Go to
Step 1
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