'95 Altima lash shimming
Tried to replace a shim all day with no luck so today I worked on the bench with an old warped head. After a few failures what I have working on the bench is this: take an old bucket, put on shim, put another bucket on top and lining up the notches one can see the shim has play; I cut off a bucket bottom and cut out most of the center disk. Then, cutting it almost in half, taking the bigger piece, maybe 185°, I cut its height to slip into and onto a compressed bucket, valve open, then pushed it until the open end was toward the inside of the head, then rotated the engine bring the lobe up. Now the ring was holding bucket down, the ring wedged under the cam. A scribe into the notch freed the shim and it was easily removed and replaced - on the bench. Bottom seems better because leaving some of the disk toward the back helps keep the half ring from expanding and slipping allowing the bucket to rise inside. It may be good enough to simply make the entire height so any edge can slip between a bucket cylinder top and the cam. Fighting for a little extra space with a non-flat top to the ring may have been time and effort wasted. At 185° half ring one needs to tweak, grind, the ends to get the shim to slip out or it will hold it in. Removing the ring, rotate the engine/cam so the lobe passes in/out the half ring opening or the half ring will conflict with the lobe.
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