How can you tell the difference between worn out valve seals and worn out rings?

Cars & Vehicles

Bad valve seals generally produce smoke after start up only or after a period of idling. Worn out rings would smoke continuously. A compression test would verify the condition of the rings.

Try a wet and dry test of the compressions. Get a set of readings dry, then put a teaspoon of engine oil in each bore, turn over and re-test.

Worn rings will have improved readings when wet. Worn valves will show no difference.

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