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you can get a set of gaskets through dorman they cost about 110 dollars the driver side is a little harder there is a vent on that side leave it on the cover if you take it off the little rubber gasket will leak also disconnect your batteries because the wires for your glow plugs and injectors are molded into the valve cover gaskets there is a video on you tube just type in your truck and change valve cover gaskets
If compressor is running, a spray bottle with a soapy water solution should reveal right where the leak is. Easiest to shot across the vehicle from underside. Driver side- shoot from passenger side, and passenger side shoot from drivers side.
If no bubbles appear, the issue may be in the valve controls.
no such thing as a valve cover valve. you have a leakey valve cover and you replace the gasket, if you do one do both they come in a kit. also to do that job you have to do the intake gasket and plenum gasket as well. about $150.00 in parts maybe 5 hours labor
remove the valve cover bolts. remove the valve cover. scrape off the old gasket material off the cover and the engine. put the new gasket in place and replace the bolts and tighten...dont over tighten.
If it is leaking around the valve cover then that is the problem. Just remove the bolts from the valve cover in a cross pattern (ex. back right - front left and go back and foward and work till you make it to the middle. Go purcahse a valve gasket for both right and left and replace them. Tighten in the same cross pattern and be careful no to pinch the 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.
Most possible oil leaks from valve cover rubber oil seal. Remove valve cover, inspect , clean surfaces, and replace with new rubber oil seal .
Good luck!
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