Re: Stuck Valve

Posted by Rusty O\'Toole On 2009/7/26 17:01:36

While you have the head off check the cylinders for wear. A quick check is to turn the engine so the piston goes down and look for a ridge at the top of the cylinder. Scrape the carbon with a utility knife. A carbon ring can fool you into thinking the cylinder is worn,when it really isn't.

If there is a noticeable ridge you will want to measure the taper with a micrometer. Up to .007 you can get away with new rings. Over .007 you are supposed to rebore and install new pistons but there are special rings that allow you to avoid reboring.

What we are talking about here is a "ring and valve job". Grind in the valves, deglaze the cylinders and install new rings.

This was a standard repair on all cars until the fifties. If the motor was not too badly worn it would restore it to like new performance for 20,000 or 30,000 miles of service.