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Yeah, remove the valve cover first, check the rockers to see if you can find the bad one. One thing to pay attention to is there are small cup-shaped spacers on top of each valve stem where the rocker contacts it. I have on a couple occasions seen this thing flip out of there, possibly due to mechanical "inattention" when reassembling the engine (say for valve stem seals). If they're all there, what you need to do is take a hammer and push down on each rocker to see if you can get one to go down (hydraulic leak down) (OH! push down with the HANDLE of the hammer on the rocker, not the head!). You may need to use a few different engine positions to find it.
If you can find it, the easiest thing to do (but slightly risky) is to just unbolt the rocker assembly that needs the change (remove the sheetmetal oiler tube first, then the 4 bolts on the rocker "bracket" on the cylinder in need of repair, remove the 4 bolts gradually, a couple turns at a time), pull out the "lifter" (it's actually called the hydraulic compensator on an overhead cam engine), put a little motor oil in the new one, and reinstall it. I say "risky" because you should really measure things, but requires a special tool and the likelyhood of anything needing adjustment is slim. The adjustments, in case you want to know, can be done in 2 places: The cup-shaped spacers are available in 2 thicknesses, and also in the rocker arm where the compensator goes in is a shim (it's the part you can see on top of the rocker, usually with a "dot" in the center. That's NOT a hole, it's an ID dot that designates the thickness of the shim). I think there are 4 different thicknesses available; no dot (thinnest)
one dot (most common), 2 dots, 3 dots (thickest). BTW to remove the old compensator usually it'll pull out from below easy, otherwise you can force it out from above with a rap on the top of the shim, BUT reinstall the shim!
Gilly
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