Head gasket

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 ===Head gasket re-torquing===
-Stock replacement head gaskets do not generally need re-torquing. Steel shim head gaskets should be retorqued. Racing engine head gaskets should be re-torqued regardless of the type of gasket being used.
+Stock replacement head gaskets do not generally need re-torquing. Steel shim head gaskets should be retorqued. Racing engine head gaskets should be re-torqued regardless of the type of gasket being used.  If your engine calls for Torque-to-yield head bolts (TTY) do not re-torque.
 The purpose of re-torquing the cylinder heads is to restore the proper stretch to the head bolts after the first heat cycle. Physics dictates that the engine assembly will expand as the engine temperature increases, this expansion will increase the compressive load on the head gaskets causing a seating effect sometimes referred to as creep relaxation in composite head gaskets.
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 *Chase the bolt and stud holes. Clean with compressed air.
 *Pre-fit the head gasket.
-*Don't use sealant unless the manufacturer explicitly specifies it.
+*Don't use sealant unless the manufacturer explicitly specifies it.  Some engines require NEW Torque-to-yield head bolts and these bolts should come with sealant already applied.
 *Follow specific torque settings and bolt-tightening sequence perfectly. Re-torque as specified.
 *Replace both at the same time, even if only one has blown.

Revision as of 20:34, 2 April 2010