Re: Update #2: Help on loosening Exhaust Manifold Bolts!

Posted by Andy Martin on May 06, 2002 at 10:46:32 from (12.74.161.24):

In Reply to: Update #2: Help on loosening Exhaust Manifold Bolts! posted by dvtw on May 06, 2002 at 06:40:42:

Heating the bolt expands it which breaks the rust seal. The main advantage to welding on a nut is getting a lot of heat in the bolt. If you have a propane torch i would get the bolt as red as I could and let it cool. Trying to cool the bolt too quickly could harden it and make it break.

Drilling a bolt dead center is very difficult. A bad hole in the head often results.

The value of left-hand drills cannot be overemphasized. My friend who runs an oil-field machine shop says the drill bit usually catches and backs out the bolt before he is finished drilling. We think this is a combination of removed material and heat with the force applied in the direction to back out the bolt. I don't have any left-hand drills because it is too easy to weld on a nut.

Do not apply solvents while the bolt is hot. I have coked up the space between the threads by cooking penetrating oil which had penetrated.

Try to find a friend to bring his welder over and weld on a nut. It is the easy way out.

A pipe wrench may be better than vise grips.

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