What is the torq specification for 2002 jaguar xj8 4.0L valve cover gasket?
You should be about 16ft lbs.
SOURCE: how to replace valve cover gasket on a 2002 stratus 3.0 liter engine
i don't know that vehicle very well... but there are usually bolts/screws that hold them in place. 4 to 6 of them per cover. sometimes the spark plug holes have giant nuts that hold the cover in place.
SOURCE: Saturn SC 98 valve cover torque specifications diagram
you can look up repair guides on autozones repair section, but when i replaced my valve cover on my 98 saturn sc2, I did a alternating star patern like on a tire, and I just tightened it down till I saw the seals from the spark plug wholes plump out just a lilte. I have no leaks and no problems. The torque speks in the book are in inch pounds not foot pounds. So I just did it on my own.
SOURCE: 1994 Toyota Corolla - Valve COver Gasket Replacement
You need an aftermarket serviice manual from Haynes or Chilton.
They will have that kind of info.
I know of no car (I don't know them all) where that is needed and depending on the cover material (sheet steel or cast), could lead to warping and new leaks.
I always use a thin film of silicone whether it is specified or not and there are torque specs for ALL valve covers I have ever seen.
SOURCE: Valve cover and Oil pan bolt torque
Inside to outside for torque pattern, 7 foot lbs. or 144 inch lbs.
SOURCE: Torque for tightening Valve cover bolts on Kia Sportage 95
The gasket has metal torque limiters.use your own judgement just dont break the bolts
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