Why Do They Fail?

Distributor caps may fail due to:

• Carbon tracking from high-voltage arcing

• Cracks or warping from heat and vibration

• Moisture ingress, causing corrosion on terminals

• Worn or corroded contact points inside the cap

• Poor-fitting or low-quality replacements that disrupt spark timing

Why Do They Fail?

Distributor caps may fail due to:

• Carbon tracking from high-voltage arcing

• Cracks or warping from heat and vibration

• Moisture ingress, causing corrosion on terminals

• Worn or corroded contact points inside the cap

• Poor-fitting or low-quality replacements that disrupt spark timing

Fitting Tips

1. Inspect the rotor arm before replacing the cap — replacing both together is best practice

2. Ensure the new cap matches the original in size, terminal layout, and material quality

3. Clean HT lead connections and apply dielectric grease if recommended

4. Secure the cap evenly to avoid distortion or poor sealing

5. Check ignition timing after installation where required