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 MANUALSBUICK1985CENTURY V6-231 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSCATALYTIC CONVERTERSERVICE AND REPAIRCATALYST REMOVAL
1985 Buick Century V6-231 3.8L
Catalyst Removal
1985 Buick Century V6-231 3.8LSECTION Catalyst Removal
Fig. 23 Aspirator installation:
Fig. 24 Vibrator installation:
Monolith type converters are not serviceable. The following procedure applies only to pellet type catalytic converters.
1. Raise and support vehicle.
2. Install aspirator, Fig. 23, and connect an air line to aspirator, creating a vacuum in the converter, thereby holding pellets in place when fill plug is removed.
3. If converter is equipped with threaded fill plug, use a 3/4 inch Allen wrench and remove fill plug from converter.
4. If converter is equipped with pressed fill plug, lightly drive a small chisel between converter shell and fill plug until fill plug distorts. Remove fill plug with pliers. Do not pry fill plug from converter, since damage to fill plug sealing surface may result.
5. Install vibrator and catalyst container, then adapter J-25077-6, if equipped with pressed fill plug, Fig. 24.
6. Disconnect air line from aspirator and connect to vibrator. Catalyst will now drain from converter.
7. When all catalyst has been drained from converter, remove container and discard the used catalyst.
RENDER: 1.0x
NO RELATED
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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.