Thanks for the pics, Rocky. It looks like retrofitting the oiler should be very doable. The 051 case has a plastic elbow (that's what Stihl calls it) that mounts in the same spot as the manual oiler. It utilizes the same mounting bosses. The lower oil passage (the one directly in between the mounting bosses) is used on, both, the auto & manual oilers. The upper one is used only on the manual oiler and it would need to be drilled. The side mounted oil fill gives you a direct visual of that area & I can see that, not only is the casting there, it's already partially drilled & machined for the rubber seal that goes there! To complete the passage, one only has to drill from the exit location (directly above the existing auto oiler hole), into the case to intersect with the delivery passage. That is an angled hole, & the casting is provided for that as well. One would need to be accurate on the direction & angle of that passage. Actually, if you look at Dave's 2nd pic, you can see that casting protrusion where the oil passage exits into the feed channel. It's directly above the rear bar stud, at the end of the channel (the long, skinny one). That dark spot, at the forward end of the channel, appears to be a hole, but is not (that had me going for a bit).
The only hiccup (and it's a minor one) is the creation of the threaded boss where the pump screws into the top of the tank/case. The raised flat portion, that the pump seats against, on the inside of the tank, is already in the casting. That's a GOOD thing, because that measurement is crucial, for the pump to seal against it (you can see that area at the very top of Rocky's last pic). That only leaves the need to drill & tap the threads for the special nut that screws into the top of the case. By looking at Dave's first pic, it appears that the threaded area is raised a bit & there is a bevel, above the threads, where the O-ring seats. That step will require a little more indepth scrutinizn'.
I will provide step by step pics when I do the mod.
Anybody know where I could pick up a manual oiler? The IPL says the pick-up hose that is connected to the 051 "elbow" is the same # as the 076 hose.
Rocky, thanks for dragging those parts out & taking pics. Dave, your "clutch" pics were also helpful.
