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An expert who has answered 20 questions.
Re: 2001 jeep cherokee valve cover gasket
It's not terribly hard, easier if it's a four cylinder than a six. You can judge for yourself, look under the hood, If you have a plastic engine cover in there, take it off, it's just snapped on and usual plastic. The valve covers are rectangular metal covers the length of the engine and perhaps 4" wide. You have one if a four, and two if a six. The four cylinder design is right in th middle, the six are two on each side.
Now look at the wires and hoses and how many need to be moved to get at the six or so fasteners that hold it down. This is where most of the time is. It's just a matter of getting the fasterners loose and removing the cover. Scrap off the old gasket, which probably isn't going to be much. Use for locktite silcon sealer put on new gasket fastner cover back down.
I usually can do this in about an hour. Therefore answer to your question is $60-80 labor depending where you have it done. The gaskets are probably $25. You can check this online at one of many parts suppliers. One I like is Rockauto.
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My first question would be, what was the original trouble code that directed the mechanic to replace the sensors ? You seldom need more than one O2 sensor at a time. Its possible the exhaust manifold is leaking and that might cause a problem that would turn on the warning light. Or it could be something else. A valve cover gasket will leak oil if it fails. No check engine light.
there is a freeze plug back of the head that could be it.or leaking head gasket or the studs or bolts that hold the manifolds on may go into coolant passage. just remove stud or bolt and applie sealant to the threads and reinstall
First thing you need to do is actually verify exactly what is leaking. A leak that appears to be from under the engine can be caused by a valve cover gasket (anything up top will run down) I have no idea what valve would need replacement but on the valve cover towards the rear, there is a orifice fixture that replaces the pcv valve. they can be cleaned out and re-used by spraying carb cleaner through them and using a thin piece of wire to loosen any crud in there.(remove from cover to do that) Make sure there is vacuum in the line going to it so it is able to work. (clean out line and fitting if no vacuum). Doing the above lessens crankcase pressure and often will stop leaks. If the leak is from the rear of the pan, there are two gaskets (a gasket and a seal). The oil pan gasket rarely leaks and most often it is the rear main seal that needs replacement. To do this correctly the transmission needs to be removed. If the leak is slight, consider using lucas engine sealer. It is one of few products that will not harm any internal components and will in many cases either lessen or stop a leak.(takes some time though as most leaks are caused by hardened seals that take time to soften up again). Did the shop cause the leak? It's possible but only if they loosened valve cover or pan bolts on purpose....I can't see any shop doing that as part of a trans service and if done intentionally to cause a leak, they would be causing themselves far more grief than it is worth!!! So, my answer to that is no.
Take a putty knife or similar and tap it between the valve cover and engine. The gasket sealant is holding the cover on. When you replace the valve cover you will also use a sealant after scraping the old off.
It is possible that your PCV Valve is not functioning as well as it should,,,also,,it may be that your engine has excessive wear in the piston rings and lower oil rings,,causing excessive blow by into your engine crank case.
This will of course affect how your engine runs and how much oil is consumed.
Check PCV valve and replace as neccessary.
If this doesnt work,,i'd suggest taking it to a mechanic.
See if the oil is above or below your valve cover. If it is above, clean your CCV and replace CCV gromet. If it is below, replace your valve cover gasket. If you really can't tell, spray carb cleaner on the engine when it is cold. Spray from top down and make sure it is clean in the area around the valve cover. Now watch where your oil is coming from and follow steps above.