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Re: how to remove the valve cover to replace gasket
What kind of engine? If it's a 3.0L Vulcan, you have to take off the upper and lower intake manifolds and you'll be able to take the valve covers off. There's a bunch to take off before you get to that point. The EGR Valve, Throttle body assembly, ignition coil pack, etc. Make sure you relieve the fuel system pressure (it might be behind the right side well cover of your trunk- disconnect that connection), and take off the negative battery terminal before begining work.
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If it is a 6 cylinder engine you will probably need to remove the intake manifold to replace the rear valve cover gasket. If that's the case the intake manifold also has two hidden screws in the rear against the firewall as well as an EGR exhaust line that must be removed before the intake manifold will come off. I highly recommend you buy a haynes repair manual for your make/model and a flexible mirror-on-a-stick to use for dis-assembly. The spark plugs can be removed after the valve covers are removed (if the valve cover is leaking you will likely have oil pooled around the plugs anyway).
Buy valve cover gasket kit with plug tube seals .. remove valve cover.. Clean everything .. replace seals replace valve cover gasket and reinstall valve cover. Clean sparkplug wires connectors.. Try Rockauto .com for this part about $25. about 1/2 price of local auto parts store. Tighten Valve cover screws to correct torque specs.. for best job.
My suggestion is to make sure there's no oil spilled from putting any in. Take it to a car wash leave engine ON stay away from fuse box and battery tray. Use the engine degreaser mode and wash your engine rinse thoroughly with the rinse mode after. If the problem still occurs. Check to see around top of motor if any smoke is coming out or if fluid is coming from valve cover. If so replace the valve cover gasket which is usually cheap.
if it is just one and the mechanic is reasonable and there is no other damage ,ie main bearings, valves, cylinders scored, around 800 per head gasket and if one head needs to be shaved you better get the other head shaved and gasket replaced..i had my 2000 taurus done for 1200 couple years ago. it ran for a few years then developed low compression from the coolant leaking into the cylinders..never had luck with mine hope you are having better luck
remove spark plugs and high tension cords/ remove the valve cover bolts using socket wrench/ use screw driver to lift up the valve cover/ clean the lid/ put a new gasket and put silicone gasket sealant on the edge of half moon rubber gasket to avoid leak/ tighten the bolts/ put the plugs and wire back...