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 INSTALLATION
1985 Buick Century V6-231 3.8L
Catalyst Installation
1985 Buick Century V6-231 3.8LSECTION Catalyst Installation
Fig. 25 Catalytic converter service plug installation:
1. Fill container with recommended replacement catalyst and install fill tube extension to fixture.
2. Connect air line to aspirator and vibrator, then secure container to fixture.
3. When catalyst stops flowing, disconnect air line from vibrator making sure catalyst has filled converter flush with fill plug. Add catalyst, if necessary.
4. If equipped with threaded fill plug, apply suitable anti-seize compound to threads and install into converter. Torque fill plug to 50-60 ft. lbs.
5. If equipped with pressed fill plug, install service fill plug kit with dished fill plug facing outward, Fig. 25.
6. Disconnect air supply from aspirator, then remove aspirator from converter.
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.