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How to Diagnose Cylinder Head Gasket Failures?

How to Diagnose Cylinder Head Gasket Failures?

by Tsaijoye 14 Apr 2025 0 Comments
How to Diagnose Cylinder Head Gasket Failures?
  1. Check for Coolant Contamination
    Inspect the coolant reservoir or radiator for oil droplets, milky residue, or bubbles (indicating combustion gases entering the cooling system).

  2. Monitor Exhaust Smoke
    Look for white, sweet-smelling smoke (coolant burning) or blue-tinged smoke (oil burning) from the exhaust.

  3. Test for Compression Loss
    Perform a compression test across all cylinders; uneven or low readings may signal a breach in the gasket.

  4. Use a Chemical Block Tester
    Detect combustion gases in the coolant using a block tester kit, which changes color if exhaust gases are present.

  5. Inspect for External Leaks
    Check for visible coolant or oil leaks around the cylinder head and engine block junction.

  6. Analyze Oil Condition
    Examine the oil dipstick or filler cap for a milky, frothy appearance (coolant mixing with oil).

  7. Monitor Overheating Issues
    Rule out other causes of persistent engine overheating, such as thermostat or radiator failures.

  8. Pressure-Test the Cooling System
    Use a cooling system pressure tester to identify leaks or pressure drops indicating gasket failure.

  9. Replace the Gasket if Confirmed
    If multiple symptoms align, replace the head gasket and resurface the cylinder head to ensure a proper seal.

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