Guardian Oil Burning / Incomplete Combustion

Excessive blue or white smoke from exhaust during startup and running.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Overfilled engine oil, Worn piston rings or valve guides, Restricted air filter, Prolonged light-load operation causing wet stacking

Safety first: Run the generator only in a well-ventilated outdoor area. Avoid breathing exhaust fumes.

Check oil level: Verify oil is not above the full mark. Drain excess oil if overfilled.
Replace air filter: Install a clean air filter to ensure proper air-fuel mixture.
Load the generator: Run the unit under at least 50% of rated load for 30–60 minutes to burn off accumulated deposits.
Engine inspection: If heavy smoke persists, have a Guardian technician perform compression and leak-down tests to evaluate internal engine wear.

Hard 4/5

Piston Ring Set

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