Date registered: Nov 2014
Vehicle: 1990 350SDL, "Grandpa's Roadster" Project Car
Location: New Hampshire
Mentioned: 9 Post(s)
Quoted: 789 Post(s)
If they ground the valves and seats, everything is different. (If they didn't, what was the point?)
The pin gauge measures the extension of the hydraulic compensator. It has to be within an acceptable range of its total movement to accommodate all running conditions.
If the readings are not repeatable, something is wrong. The extension of the compensator is determined by the profile of the cam lobe, the geometry of the rocker and the height of the tip of the valve stem. The only thing that can, or should, vary is the compensator itself, and if it does, it will introduce clearance between the cam and the rocker.
"Real engines don't have spark plugs!"
Last edited by John350; 03-10-2019 at 05:03 PM.