ISUZU TRUCK CYLINDER HEAD VALVE

I Need A Diagram, And Instructions On Adjusting The Valves On A 2.3l Isuzu Moter

So How Do L Fix Timing On The Campshaft Gear. On Camp Shaft Gear There Is A Mark Painted In White. So The White Mark Faces East Or West

Here Are The Pistons Like Piston 3

The Type Of Engine That L Have Is A 4fh1 On Isuzu Elf 250. Is My Problem On The Campshaft Timing?