OEM Mopar Cylinder Heads
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Checking Cylinder Heads for Wear: Expert Tips
The cylinder head sits atop the engine block, housing the vital valvetrain components and sealing the combustion chamber. For your Dodge Durango, this massive aluminum or iron casting contains the intake and exhaust passages necessary for engine breathing. A warped casting or blown cylinder head gasket will immediately cause catastrophic engine failure.
How to Inspect Your Cylinder Head
1. Check for Coolant Mixing
Milky, brown engine oil indicates a completely ruptured cylinder head gasket.
2. Inspect for External Leaks
Look for dried white coolant crust weeping from the block mating surface.
3. Perform a Leak-Down Test
Use compressed air to listen for hissing escaping past burnt internal valves.
4. Check for White Exhaust Smoke
Thick, sweet-smelling tailpipe smoke proves the engine is actively burning coolant.
5. Measure for Warpage
Use a precision straight-edge and feeler gauge to ensure the mounting deck is perfectly flat.
Frequently Asked Questions
- How much does it cost to replace a head gasket?
- It is highly labor-intensive, often costing over two thousand dollars professionally.
- What causes a cylinder head to warp?
- Severe engine overheating physically melts and bends the aluminum structure.
- What is a valve job?
- Re-machining the valve seats and faces to restore perfect engine compression.
- Can a cracked head be repaired?
- Sometimes via specialized welding, but replacement is the only guaranteed safe fix.
- Why is my oil milky white?
- A blown gasket is violently churning coolant and engine oil together.
- Are diesel heads different?
- Yes, they are massively reinforced to handle astronomical compression ratios.
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