The 2001 Mitsubishi Montero Sport 3.0 liter engine valve cover torque specification is 40 pounds. You do not want to over torque the valve cover bolts, as you may ruin the valve cover gasket.
/the water circulating noise could be low coolant in the system. If the coolant is bubbling in the overflow bottle, then check for a blown head gasket causing the noise.
Replacing the head gasket on any vehicle is a long and complicated process, however if you wish to see basic step-by-step instructions go to the related question on the right side of the page "How do you replace a head gasket?"
By replacing the whole gasket.
Yes there are sealers out there that can be used to seal or repair the gasket
It requires replacing the head gasket.
It could, if the old gasket had failed.
Yes.
115 - 125
up your but and around the cornner
If you are using a new gasket, no.
how do you replace the valve cover gasket on a 2002 mitubishi lancer