Valve clearance for mitsubishi L200

Take the rocker cover and the upper timing belt cover off.
Set No 1 Cylinder to TDC - use the markings on the cam spocket to get this - and confirm it's on the compression stroke by check both inlet and exhaust valves are closed and on the heel of the cam.
In this position, check rockers 1,2,4 and 5.
Take care with the feeler guage to make sure you're right under the pad under the adjuster screw properly and completely passing under it, not sticking part way.
Rotate the engine (crank shaft) 360 degrees. This should bring No 4 to TDC - confirm that both inlet and exhaust valves are closed and on the heel of the cam.
In this position, check rockers 3,6,7 and 8.

Clearance for Intake and Exhaust is 0.25mm at normal engine operating temp.

Don't forget to fit a new rocker cover gasket and half moon seal (use something like Hylomar to help make sure the half moon is sealed properly - usual suspect when rocker cover leaks at the back of the engine).