And if you then change shims to get that .10mm clearance down to the middle of the correct range at say .05mm, you have moved the true clearance to approximately zero.
Which would be bad.
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And if you then change shims to get that .10mm clearance down to the middle of the correct range at say .05mm, you have moved the true clearance to approximately zero.
Which would be bad.
G
Guest
Guest
Daniel,
I think you are the one that doesn't know very much about camshafts. No worry though, I'll be glad to teach you.
In a fantasy world, with a one lobe camshaft, you could position the cam lobe over the bucket in a wide range of positions and as long as the base circle is positioned over the bucket that would be fine for measuring the lash. The "base circle" is truly a circle thus the lash won't change regardless if the lobe was pointing up, forward, or back; as long as the base circle is positioned over the bucket you will get the same lash measurement. In the case of a 4 cylinder GS Suzuki though, we don't have the luxury of multiple acceptable camshaft lobe positions.
The camshaft has clearance all around the journal bearings, from .04-.07mm, so the camshaft can float around a fair bit in this clearance. Suzuki's specified inspection method places adjacent valves (such as E1 & E2) on their base circles at the same time, so neither valve spring is pushing up on the camshaft and skewing it in the journal clearance. When the cams are properly positioned this way, the the most accurate lash reading can be made and the valves should be adjusted together in pairs.
If some unknowing person miss positions the camshafts, with one of the adjacent valves pushing upward on the camshafts skewing it in the journal clearance, a false reading will be taken. For example, suppose a valve has .05mm lash, but someone mispositions the adjacent lobe thus skewing the cam in the journal clearance.05mm, the valve will measure as .10mm instead of the correct .05mm.
Is the light starting to come on now? Hopefully yes.
Thanks Ed, I thought what you and Tom said earlier was nice and clear to me, but seeing that highlighted with the diagram makes my little brain take it in a lot clearer now.