Set points, dwell and ignition timing
Setting points gap, dwell and ignition timing on the Lucas distributor is straightforward when done in the right order. Static-time to get the engine running cleanly, then strobe-time warm with a timing light for the definitive setting. All figures come from the workshop manual for the specific engine.
Tools
- Feeler gauges
- Dwell meter (optional but useful)
- 12-volt test lamp
- Timing light (strobe)
Parts / supplies
- Fresh points and condenser
- New spark plugs of the correct grade
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Procedure
Rotate the engine by hand until the distributor cam is on a peak. Set the points gap to the workshop-manual figure using feeler gauges.
If a dwell meter is available, start the engine and confirm the dwell angle matches spec. Adjust the points gap if not.
Turn the engine off. Rotate to the specified static timing mark for cylinder one on the compression stroke.
Slacken the distributor clamp bolt. Connect a 12-volt test lamp between the distributor points terminal and earth, with the ignition on.
Rotate the distributor body slowly against the direction of shaft rotation until the lamp just lights, the points are just opening. This is static timing.
Tighten the clamp gently, start the engine, and warm up.
With a strobe timing light on the crank pulley, confirm timing at the specified idle rpm and adjust the distributor to align the mark. Retighten the clamp fully.
Warnings
- Ignition system carries high voltage. Do not touch HT leads with the engine running.
- Guard against fuel spillage from carburettors when working near a hot distributor.
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About the author
A lifelong classic-car enthusiast in North Yorkshire, near Thornton-le-Dale, who owns and maintains an AC Aceca, writing the single-model reference he always wished existed. Read the full bio.