Weird valve clearances?

While changing valve seals, I did a valve seat and face cleanup with just mild lapping, After assembling the head (putting same parts where they were originally of course) I got these clearances.......

Intake One .05mm / Two .05mm / Three .10mm / Four .04mm

Exhaust One .05mm / Two .05mm / Three .08mm / Four .04mm

[These are the feeler gauge sizes that would fit without forcing]

These seem a little tight to me as I understand that minimum clearance should be .08mm, but do you guys see a problem? And if so, what can I do about it?

Thanks!

polkat wrote:

While changing valve seals, I did a valve seat and face cleanup with just mild lapping, After assembling the head (putting same parts where they were originally of course) I got these clearances.......

Intake One .05mm / Two .05mm / Three .10mm / Four .04mm

Exhaust One .05mm / Two .05mm / Three .08mm / Four .04mm

[These are the feeler gauge sizes that would fit without forcing]

These seem a little tight to me as I understand that minimum clearance should be .08mm, but do you guys see a problem? And if so, what can I do about it?

Thanks!

If specs @ .05~.10mm clearance, would go next thinner shim at the two .04mm sites to get .09mm clearances.

Not critical imo but won't hurt to go next thinner shim at the four .05mm sites to get .10mm clearances.

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Well, here's what is also weird. I understand shims were made in .05mm increments, but when I measured the shims before I reinstalled them, I got some weird numbers like 2.54mm (three like that), one 2.59mm shim, a 2.56mm, a 2.64mm, and two 2.48mm's. My measuring technique is accurate (a good quality millimeter caliper). They look good (not much visable wear) but that doesn't sound like original factory sizes to me. If I need them, where can I get individual shims?

Also, I may not have always put the same side of the shim against the valve stem when I reinstalled. Would that make a difference (doesn't seem so)?

Lastly, I have found several shim buckets that spin fine when installed, but are quite difficult to remove from the head. Is there a trick to this? Thanks!

polkat wrote:

While changing valve seals, I did a valve seat and face cleanup with just mild lapping, After assembling the head (putting same parts where they were originally of course) I got these clearances.......

Intake One .05mm / Two .05mm / Three .10mm / Four .04mm

Exhaust One .05mm / Two .05mm / Three .08mm / Four .04mm

[These are the feeler gauge sizes that would fit without forcing]

These seem a little tight to me as I understand that minimum clearance should be .08mm, but do you guys see a problem? And if so, what can I do about it?

Thanks!

Just a friendly reminder that it's usually very helpful to those responding if a poster will please include make and model within signature. Saves a lot of guessing and enhances accuracy of reponses. [See following.]

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