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.
Ignition Distributors
Ignition timing is varied with mechanical advance mechanisms, and with vacuum advance and retard systems, if equipped. Some distributors have two single vacuum units which work in opposite directions for advance or retard modes. Other distributors have one double acting vacuum unit with two vacuum lines for advance and retard operation. All late models use distributors with vacuum retard and mechanical advance only. No vacuum advance is used. Stag models also use a distributor with two point sets which operate in parallel to extend dwell period.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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