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A cracked head will usually cause excessive pressure in the water jacket resulting in coolant being forced out of the radiator even before the coolant has heated sufficiently to cause the thermostat to open. Typically the engine will run hot as well.

You may also experience white smoke from the exhaust especially at startup. You may see a white or grey foamy substance on the underside of the oil fill cap. Your oil level may be overfull. Lastly you may have an engine miss.

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Q: What are the signs of a cracked cylinder head?
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