Hello I live in Canada and I own a 1991 Toyota Previa with the 2.4-liter twin- cam 4-cylinder rated at 138 horsepowerengine with 331 000 km.After changing my valve cover gasket, I over tightened one of the valve cover bolts and it snapped.On one of the cover,the spec for the valve cover bolt is 29 psi,I replaced the broken bolt and I still have a very small leak,can some one tell me the sequence of tighten the bolt and if 29 psi is the correct number. Paul