How to adjust the valve of Taishan 295 tractor?

I wonder what's the difference between your machine and ordinary one? Generally, the engine opens the valve cover, unscrews the valve adjusting nut, and measures the clearance with a feeler gauge before tightening! If you want to adjust, adjust each cylinder and turn the crankshaft to the corresponding position respectively, and pay attention to avoid the valve opening and closing angle being too late! !