I have an '88 b2200 that started ticking like the valves are out of adjustment, but the manual states the engine has hydraulic lifters that need no adjustment. So my thought is that a lifter is clogged and needs to be replaced.... but i can't actualy find the lifters! It looks like the rockers rest directly on the valve with no lifter, but there is no way to adjust for valve clearance either! any ideas??