how to check for blown head gasket | WTA Guide
# How to Check for a Blown Head Gasket: A Professional Guide
A blown head gasket is a critical engine failure that can lead to costly repairs if not detected early. Professionals in the engine sealing industry must recognize the signs and apply accurate diagnostic methods. Below are key indicators and testing procedures.
Common Symptoms of a Blown Head Gasket
- Overheating Engine – Persistent high temperatures due to coolant leakage into combustion chambers.
- White Exhaust Smoke – Indicates coolant burning in the cylinders (steam-like emission).
- Milky Oil – Coolant mixing with oil creates a frothy, discolored residue on the dipstick.
- Loss of Coolant – Unexplained low coolant levels without visible leaks.
- Bubbles in Radiator – Combustion gases entering the cooling system cause bubbling when the engine runs.
Professional Diagnostic Methods
1. Compression Test
- Measures cylinder pressure; significant variance between cylinders suggests a leak.
- A drop of 15-20% in one cylinder indicates potential head gasket failure.
2. Leak-Down Test
- Pressurizes each cylinder to identify escaping air through the cooling system or adjacent cylinders.
3. Chemical Block Test
- Uses a dye that changes color when exposed to combustion gases in the coolant.
- Highly accurate for detecting small leaks.
4. Visual Inspection
- Check for oil/coolant mixing, carbon tracking, or external leaks around the head gasket.
Prevention & Best Practices
- Maintain proper coolant levels and quality.
- Avoid engine overheating by ensuring cooling system efficiency.
- Use high-quality head gaskets designed for specific engine applications.
By recognizing symptoms early and applying precise diagnostics, professionals can prevent extensive engine damage. Trust WTA for expert-engineered sealing solutions.
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