On a 3.0l ranger are the valves adjustable? I ve had my valve covers off before but I dont remember adjustment screws on the rocker arms to adjust the clearance with a feeler gauge

 

Not unless you have some custom made ones AFAIK.

 

Does anyone know what the correct valve tolerance is supposed to be on a 3.0 L engine and how do I check for the correct specs on each valve so that I do it correctly?

 

What exactly are you trying to do? I could be wrong (it happens a lot!) but it sounds like you want to adjust them like you do on a chevy engine and these are non adjustable.
If you are trying to adjust them, what symptoms are you having to even want to do this?

 

I'm having a misfire on cylinder 5. Ive done a compression test and found cylinder 5 is low,, 6 is low as well.. Im on my second engine but I'm almost certain its the top end ( valves, blown head gasket ) I'm try to do everything to diagnose the bottom end to make sure I'm not just wasting money on this engine. I think the rings are good, but I need to check the cam-lobe. I was told to measure the distance between the rods and the rockers, and that will tell me if it is good. All of them are supposed to be the same distance.
I've never done this test and I've not taken the valve covers cover a while, but I need someone to tell l me exactly how to check the cam-lobe to see if it is good or not. Thanks

 

What year engine? There were some years known to have bad valve seats. 3.0l are also know for head gasket issues but from what I know, they have pretty robust cams. The lifters, pushrods and rockers are more likely to wear out long before the cam.

 

Have you done the "Wet" compression test? Add about a teaspoon of oil to the cylinder. If the compression increases with the wet test (more than 10 percent), the results identify the problem as the piston rings and/or cylinder walls. The oil added to the cylinder is now providing a wet seal for the rings.
After reading your other thread it does look like a head gasket though.

 

Yes I did a wet test. The compression did not increase. That's what lead me to believe the pistons are good. So then I wanted to check everything else before I put new heads on this engine. The engine has maybe 200,000. Its the second engine. USED

 

As said there is no valve adjustment NEEDED for the 3.0l Vulcan engine, or any way to do an adjustment

Just measure the distance that the rocker moves from full closed to full open, and compare that to other valves

3.0l Vulcan engines did have exhaust valve issues, but not Cam issues
So more than likely the exhaust valves are burnt so are not sealing properly

I would just pull the heads and see what you have
After heads are off put spark plugs back in
Flip the heads upside down, and prop them up so head surface is level, fill each head chamber with water
Then wait and watch
Valves shouldn't leak water out
You will see it if they do