Re: tracking down ticking noise

Posted by Owen_Dyneto On 2019/5/8 7:43:20

Your thinking about the gap is applicable to mechanical lifters, but not hydraulics.

The use of the tool and the specification for the gap is only to maintain the gap within the ability of the lifter to accommodate. When the engine is running, there is no "gap" between the lifter and the valve stem - the function of the hydraulic lifter is to extend and eliminate the gap. And when the engine gets warm the valve stem expands (lengthens), thus in your case allowing the valve head to touch the cylinder head, or at least that's my guess. Why it didn't occur before is a good question, were the valves reinstalled in the same positions they were removed from?