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The cost of the replacement component (i.e. the head gasket itself) is usually relatively low, however there are significant labor costs involved in the replacement process. [6] This is because the process of removing and replacing the cylinder head is a time-consuming task.
Wills Rings are expensive in comparison to other seals, such as elastomer O-rings or metallic foil head gaskets. A typical comparison is one ring [note 4] costing approx. $50 each, [8] around the price of a high-performance head gasket for a four-cylinder engine.
The head bolts must be re-torqued (retightening process) regularly. [10] Factory service manuals recommend that head bolt torque be checked every 4,000 mi (6,400 km) and to re-torque them every 8,000 mi (13,000 km). Modern head gaskets can extend this service interval to re-torque the bolts every 12,000 mi (19,000 km), or every other year.
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Gaskets are commonly produced by cutting from sheet materials. Given the potential cost and safety implications of faulty or leaking gaskets, it is critical that the correct gasket material is selected to fit the needs of the application. [3] Gaskets for specific applications, such as high pressure steam systems, may contain asbestos. However ...