SOURCE: 2003 F-350 6.0 TDI, Front Main Seal, Head Gaskets, and Valve Cover Gaskets
ok make sure to check or replace the unexpensive pcv valve
if that one is cloged it will coause all kind of leaks even whit new seals
and on the head gaskets problem i will recomend to get your radiator serviced or replaced because 90% of the mechanics check your radiator for cloged lines but they always do it at the top and by gravity all the garbache acumulate on the bottom, if you don't beleive it ask your mechanic hos does he inspect your radiator
SOURCE: After replacing valve cover gasket with dry fel-pro gasket,
Your new gasket has tabs that make it easy to set in place; the tabs hold the position properly on the cylinder head. The gasket also has the rubber coating to establish a tight seal between the cylinder head and the the valve cover, even if there is slight damage or warping. Proper torque for the valve cover bolts is between 50-100 in-lbs., which is about 8 ft-lbs for a maximum.
If you have the gasket properly set, and proper torque on the valve cover bolts, you should not leak.
If you still experience a leak after double checking the gasket and the bolt torque, I would replace the valve cover itself. You will find several at most any salvage yard, and probablly will cost you $10.00 or less for a used valve cover.
I hope this helps you, and I wish you luck on your repair.
SOURCE: valve cover gasket and grammets
Go buy a valve cover gasket and put it on. Mark and pull plug wires, remove valve cover bolts. Remove old gasket {the gasket has the grommets on it} and replace. No need for anything else.
SOURCE: 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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