I have a 91 Toyota Corolla sedan,built in Japan. It has 173,000 miles on it,and I am going to have to have a valve cover gasket kit installed on it. Now while I have the valve cover off would it be a good idea to have the head bolts re-torqued? Thanks

ANSWER

wigglepin

ANSWERS: 1

Old School

Re-torquing the head bolts is at worst unnecessary and could actually be harmful. If the head bolts have held tight for 173k miles, it's doubtful that they'll fail now. Re-torquing is generally only done after a few hundred miles following a gasket replacement to ensure that any compression of the gasket has not caused the bolts to loosen. In 30+ years of working on cars, I've never heard of an instance of head bolts working loose. If your Corolla uses torque-to-yield bolts, then they can only be tightened once and must be replaced if they are ever untorqued. In short, just leave them alone. It will be fine.

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