How to adjust the valve of heavy truck 336 engine?

The adjustment method is similar to that of a two-valve engine, mainly by rotating the flywheel to ensure that the piston of 1 cylinder is at the top dead center of the compression stroke! Then shake the rocker arm by hand to confirm that the gap is too large and needs to be adjusted. WD6 15 series diesel engines produced by China National Heavy Duty Truck in 2008 are also four-valves, but when adjusting, just make sure that the gap between the two screws is almost 0.3-0.5MM, and repeat the adjustment in turn.