It can strip the bolts, warp the head, cause the bolts to fail when the engine heats up... that's pretty much it.
standard star works just fine, be careful not to overtighten
it depends on how much you overtightened them but since theyre pretty small, your probably alright. if its leaking its liable to be your gasket. try using a real thin coat of rtv on each side of the gasket and dont overtighten the bolts.
ondo valve cover, bolts remove valve cover, remove old gasket from valve cover and block. clean both surfaces well. put gasket glue on one side of gasket and install on cylinder head. align valve cover than replace bolts . tighten in a cross pattern until thet are snug. don't overtighten.
Drain oil. Remove pan and catch remaining old oil. Remove old gasket material off mating surfaces. Ensure surfaces are properly cleaned and coat each surface with black silicone (or equivilant). Install pan with gasket in proper position. Properly torque bolts*. *If you are not familiar with how to torque bolts, and/or you do not have torque wrench, you can tighten bolts as if you were making them as tight as you can with a screwdriver (without leverage). Do not overtighten because it can damage gasket.
The gasket on an Oldsmobile Bravada is changed by removing the retaining bolts, taking off the cover, and peeling the gasket off. The surface is then cleaned and a new gasket put in place.
Get ALL of them finger tight or just a whisker tighter. Then criss-cross your way around the pan. DO NOT OVERTIGHTEN. You'll crush the gasket.
To cure the problem you will need to remove the pan and the old gasket material, and straighten the pan where each bolt has distorted it. Then, once everything is clean and dry, you need to install a new gasket, taking particular care to follow the instructions that come with it. Do not overtighten the bolts, or the gasket will split or otherwise distort, creating a path for a new leak. This operation involves replacing a great amount of ATF; and, it is advisable to replace the transmission filter while the pan is removed, if it has not been changed.
The oil pan gasket on a 1995 Chrysler 3.5 V6 engine is changed by draining the oil and removing the retaining bolts. The pan is then lowered, the gasket removed, and a new gasket put in place.
The valve cover gasket on a 84 Infinity G20 is changed by removing the cover bolts and prying the cover off. The old gasket is removed, the surface cleaned, and a new gasket put in place.
On your top main raidator hose there is a bubble looking piece. Take the bolts out of it and your thermostat is sitting in the engine block. To put a new one in get a new gasket and some silicone sealant and make sure not to overtighten the bolts because it is only an aluminum piece you are potting them into.
The oil pan gasket on a 1997 Pontiac Grand Am GT is changed by draining the oil, removing the oil pan bolts, and removing the pan. The old gasket is scraped away, a new gasket is placed on the pan, and it is bolted into place.
drain coolant, remove air intake duct,disconnect radiator hose from thermostat housing,remove bolts and lift the cover, remove thermostat.if a gasket was used, remove all traces of old gasket,install new stat,if a gasket was used apply thin layer of rtv sealant,replace cover and tightenbut do not overtighten,reattactch radiator hose,refill system, run, and check for leaks.