Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK1983CENTURY V6-260 4.3L DSLREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSOIL LEAK CHECK
1983 Buick Century V6-260 4.3L DSL
Oil Leak Check
1983 Buick Century V6-260 4.3L DSLSECTION Oil Leak Check
OIL LEAK CHECK
NOTES:
If there are complaints of "Transmission Oil Exhausting From Vent" or "Front Converter Seal Oil Leak" on 1982-83 Cimarrons, refer to "Service Bulletins" section.
To correctly identify oil leaks, perform the following procedure:
1. Clean all residual oil from transmission using suitable cleaner.
2. Dust transmission with leak tracing powder or spray foot powder.
3. Start engine and allow to reach normal operating temperature.
4. Inspect for leaks with engine running.
5. Turn off engine and allow vehicle to set for 30 minutes, then check for leaks as outlined below.
TRANSAXLE PAN OR VALVE BODY COVER
1. Attaching bolts incorrectly torqued.
2. Gasket damaged or incorrectly installed.
3. Oil pan or valve body cover mounting face damaged.
CASE LEAK
1. Filler pipe multi-lip seal damaged or missing.
2. Filler pipe bracket incorrectly installed.
3. T.V. cable multi-lip seal missing, damaged or incorrectly installed.
4. Governor O-rings damaged or missing.
5. Speedometer driven gear O-ring damaged.
6. Manual valve bore plug loose.
7. Oil cooler connector fittings loose or damaged.
8. Axle oil seals worn or damaged.
9. Parking pawl shaft cup plug, governor pressure pickup plug or line pressure pickup pipe plug loose.
10. Case to case cover gasket damaged.
11. Porous casting.
CONVERTER END LEAK
1. Converter seal cut or damaged.
2. Converter bushing damaged or moved forward.
3. Seal garter spring missing.
4. Damaged converter weld area.
5. Porous case or drive sprocket support casting.
FLUID COMES OUT OF VENT PIPES
1. Incorrect fluid level.
2. Porous case.
3. Incorrect dipstick.
4. Drain back passage holes clogged.
NOTES:
If there are complaints of "Transmission Oil Exhausting From Vent" or "Front Converter Seal Oil Leak" on 1982-83 Cimarrons, refer to "Service Bulletins" section.
To correctly identify oil leaks, perform the following procedure:
1. Clean all residual oil from transmission using suitable cleaner.
2. Dust transmission with leak tracing powder or spray foot powder.
3. Start engine and allow to reach normal operating temperature.
4. Inspect for leaks with engine running.
5. Turn off engine and allow vehicle to set for 30 minutes, then check for leaks as outlined below.
TRANSAXLE PAN OR VALVE BODY COVER
1. Attaching bolts incorrectly torqued.
2. Gasket damaged or incorrectly installed.
3. Oil pan or valve body cover mounting face damaged.
CASE LEAK
1. Filler pipe multi-lip seal damaged or missing.
2. Filler pipe bracket incorrectly installed.
3. T.V. cable multi-lip seal missing, damaged or incorrectly installed.
4. Governor O-rings damaged or missing.
5. Speedometer driven gear O-ring damaged.
6. Manual valve bore plug loose.
7. Oil cooler connector fittings loose or damaged.
8. Axle oil seals worn or damaged.
9. Parking pawl shaft cup plug, governor pressure pickup plug or line pressure pickup pipe plug loose.
10. Case to case cover gasket damaged.
11. Porous casting.
CONVERTER END LEAK
1. Converter seal cut or damaged.
2. Converter bushing damaged or moved forward.
3. Seal garter spring missing.
4. Damaged converter weld area.
5. Porous case or drive sprocket support casting.
FLUID COMES OUT OF VENT PIPES
1. Incorrect fluid level.
2. Porous case.
3. Incorrect dipstick.
4. Drain back passage holes clogged.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.