Yes, I bouht a torque wrench (AMPRO) and didn't set it up correctly therefore the screw that screws the VALVE COVER, broke. It'* says to tighten screw at 89 lb. in. and that'* what I did.
Well the question is how can I take the broken screw out the female thread of the valve cover hole. The piece is in there.

And also notice that i have another broken one on the oil pan perimeter to hold the pan.

I feel like crap cause I change the Transmission fluid and filter, engine oil filter and oil. And finally bouth the torque wrench. Everything was excellent until I wanted to find out if the valve cover screws were tight, because I smell oil when the vehicle is hot, but I also wanted to tight those with the proper lb in. I took the book out and did what it told me to do.

Thanx guys, if anybody please share with me a technique how to get screws out, when they're broken.

Are you sure that you didn't torque the bolts to 89 ft-lbs instead of in-lbs? There are screw extractors that you can buy to get the broken piece out.

John Deere Boy is right, you can buy "Bolt" extractors at most hardware stores. You'll have to predrill the center on the broken bolt first, so keep a couple of rags handy as to not get metal shavings in the heads oil gallery. I thought the same thing he did as well, you might have had it set to Ft-lbs, instead of In-lbs. I think it should have been equivalent to 7.5 Ft Lbs = (89 In-Lbs)

That'* what I was guessing. 89 inch-pounds is pretty low on the scale.

Screw extractors work best when you use a cordless drill with the clutch setting. This can simulate an impact wrench action while removing it. Easier to break free.

Leave your valve cover on when doing it to prevent debris from entering the top of the head, or stuff alot of rags in there to protect it. Use a magnet for final cleanup.

You'll also want to re-torque all of the nuts again. You're over-compressing the valve cover seals, which may lead to early failure (assuming you used ft/lbs).

Thank you all very much for the advice.

One more question. Wich brand for torque wrench. Or wich one to buy. I bought AMPRO.

Any recomendations?

personally i will use Mastercraf and craftsman...yet i have been blessed with being able to use a snap-on...to expensive though, as far as a tourqe wrench goes, a specific brand name won't a huge diffrence, unless its the cheapie wal-mart 2 dollar special..then id be skeptical!

talk about being blessed---my neighbor loaned us his 3/4" drive snap-on tourque wrench on a more or less permanent basis because he never uses it. this sucker is like 4 or 5 feet long