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How do you clean a clogged piston ring?

Published in Engine Maintenance 2 mins read

Cleaning clogged piston rings typically involves using chemical additives to dissolve carbon deposits and free the rings. Here's a breakdown of a common method:

Using Sea Foam to Clean Clogged Piston Rings

Mechanics have relied on this technique for many years to address stuck piston rings and clogged expander rings. One popular product for this purpose is Sea Foam. While there are other methods and products available, this approach is relatively straightforward.

Steps:

  1. Preparation:

    • Ensure the engine is cool.
    • Gather necessary tools: spark plug socket, ratchet, Sea Foam (or Sea Foam Spray).
  2. Access the Cylinders:

    • Remove the spark plugs: Carefully remove the spark plugs from each cylinder. This provides direct access to the combustion chambers.
  3. Apply Sea Foam:

    • Pour Sea Foam into each cylinder: Through the spark plug hole, pour Sea Foam into each cylinder cavity. Sea Foam Spray might be easier to apply for better coverage.
  4. Soak:

    • Allow the engine to soak: Let the engine sit and soak for an extended period. The reference suggests up to 3 days if you have the time. This allows the Sea Foam to penetrate and dissolve carbon deposits. A shorter soak time (e.g., overnight) may also be effective.
  5. Reassemble and Run:

    • Reinstall the spark plugs: After soaking, reinstall the spark plugs.
    • Start the engine: Start the engine. Expect some smoke initially as the Sea Foam burns off.
    • Run the engine: Allow the engine to run for a while to ensure any remaining Sea Foam is cleared and the rings are working more freely.

Important Considerations:

  • Safety: Work in a well-ventilated area. Wear gloves and eye protection.
  • Alternatives: While Sea Foam is mentioned specifically, other similar products designed to dissolve carbon deposits may also be effective.
  • Professional Help: If the problem persists, consult a qualified mechanic. Severely clogged rings might require more invasive procedures.