Valve adjustment question

[kendogg]

I searched and can't seem to find it, but does anybody have the spec for when you're trying to take the measurement from the cam lobe instead of the valve stem? I have reason to believe the valve stems in my eta may potentially be concaved, and would prefer to get an exact measurement off the cam lobe instead. I know some do it this way, as it IS more accurate, and I've done it on my previous M30 vehicles before, I just don't know if the specs are the same for M20 or M30 rockers.

Thanks!!

[jlevie]

I've never seen a spec for clearance as measured at the cam for an M20 engine. I suppose there could be a slight concavity at the valve stems, but I've never see that either. Just use the spec for adjustment at the valves.

[LJ851]

I cant remember exactly but i think it is .001- .002 tighter than at the valve. If you have a dial indicator and clamp on base you set true clearance at the valve and then see what clearance is at the cam and do the rest of them that way. I did that on a set of very concaved valves on an Alpina B6. The owner took it to another shop a little while later and they told him the adjustment was WAY out and readjusted them for him. He called after that to ask if i knew why his valves were so noisy now . ha ha, yes i do.

[StereoInstaller1]

He called after that to ask if i knew why his valves were so noisy now . ha ha, yes i do.

Why do idiot techs outnumber the qualified so bad?

I use .008 on intake, .009 on exhaust on the cam.

[kendogg]

Why do idiot techs outnumber the qualified so bad?

I use .008 on intake, .009 on exhaust on the cam.

Thank you :)

[LJ851]

Why do idiot techs outnumber the qualified so bad?

I use .008 on intake, .009 on exhaust on the cam.

You can teach someone how to "be" a mechanic. It is almost impossible to change the way someones brain functions. ( common sense, thinking outside the box, etc) This of course applies to all professions, I always think about it when i go to the doctor...