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Originally Posted by dadysev;
Come to think of it. I would get a bit of lifter noise when i first start the truck for about 5 seconds and then it would go away?!?!
i'm wondering if the lifter is stuck or something, or when i did the rocker cover gasket recently a piece broke from the hardened rubber and lodged it self somewhere in there?
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Totally normal to hear lifters until the oil pressure builds. (at least in both of my x5s). I count the seconds to determine if it's time to aid oil.
"Full " on the dipstick is the middle not the top FYI at least that's what I've read.
Back to the topic: severe loss of compression in one cylinder from exhaust valve not seating.
If you already have the valve covers off, actually doesn't even matter: take the fuel pump fuse out so the car can't "diesel" and poke an inspection camera in the cylinder and look.
If the VC are off, use a digital calipers to measure the change in height of all the valves. You may discover a critical difference, also look at the springs, a broken spring will reduce the close force and will allow all sorts of build up on the valve and valve seat.
There is a chance the valve or valve seat are actually damaged.