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- Thanks for the reply and information.
............ I would look around the #3 exhaust cam lobes for any signs of lubrication issues. It does happen that clearances do grow occasionally, but that is normally an indication of abnormal wear. It may not be too concerning after 50k miles, but it’s worth a look.
I always set valves on the high side of the spec.
Kind of a mystery.
I measured the lobes' on cylinder 3, both axis, and they matched cylinder 2 perfectly. Buckets are the same as well. The installed shims measure +/- 0.017 of their stamped value.
To note, three other gaps (4EL, 1IR, 2IR,) are slightly wider. Feeler gauges aren't precise enough to determine if any have narrowed, but going by the median between what does and doesn't fit, none have significantly narrowed, if at all.
It's just that 3EL and 3ER are significantly
different. Original shims for 3E are 0.04 thicker than 4E. Replacement shims for 3E are 0.05 thicker than 4EL.
........ is there a standard pad size that goes in from the factory, or does the factory potentially use a different shim on all valves? .......
No. The factory installed shim values can be different from one valve to the next. At least on my engine, the values do match per cylinder. So for example, both 3E shims are identical. To note, the factory installed shims are not rounded to the nearest 0.05mm. Some for example some are 184, 188, 191.