How to Diagnose Cylinder Head Gasket Failures?
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Check for Coolant Contamination
Inspect the coolant reservoir or radiator for oil droplets, milky residue, or bubbles (indicating combustion gases entering the cooling system). -
Monitor Exhaust Smoke
Look for white, sweet-smelling smoke (coolant burning) or blue-tinged smoke (oil burning) from the exhaust. -
Test for Compression Loss
Perform a compression test across all cylinders; uneven or low readings may signal a breach in the gasket. -
Use a Chemical Block Tester
Detect combustion gases in the coolant using a block tester kit, which changes color if exhaust gases are present. -
Inspect for External Leaks
Check for visible coolant or oil leaks around the cylinder head and engine block junction. -
Analyze Oil Condition
Examine the oil dipstick or filler cap for a milky, frothy appearance (coolant mixing with oil). -
Monitor Overheating Issues
Rule out other causes of persistent engine overheating, such as thermostat or radiator failures. -
Pressure-Test the Cooling System
Use a cooling system pressure tester to identify leaks or pressure drops indicating gasket failure. -
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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