Medium and Heavy Trucks
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Hi, my name is Doug.
So it sounds like you are adjusting the Exhaust valves, is that correct?
First you have to bleed the oil out of the exhaust rocker arm by putting inside of the little hole on top of the rocker arm a small 90 degree bent pick and hooking the spring and pulling outward and at the same time pushing down real hard on the end of the rocker's valve end. This will bleed the oil out of the e-brake piston that is inside.
Next when you put the feeler gage in between the bridge and rocker arm, if it doesn't go you remove the shim and get a thinner one and install it into rocker and try and install the feeler gage. if is too loose get a slightly thicker shim until the feeler gage just fits snugly.
It's a trial and error process. Figure about 3-4 hours to run the complete over head and install the valve cover and air cleaner.
I hope this helps and please rate my help for today, thanks.