Provincial
Well-known member
I picked up an L-wrench last week. It is marked 0Y-117-3/8 and has a 3/8" 12-point box end. It follows the pattern of special wrenches used on aircraft engines in the pre-1950 era. It has a washer attached to keep the box end from dropping down beyond the nut being tightened. I have seen this on wrenches used on "Pal" nuts (a stamped-steel nut) used as locking devices on aircraft engines, but the Pal nuts are quite shallow, and this box end is too deep for that application. 3/8" hex is appropriate for 3/16" (#10) fasteners, so this was unlikely to be used for anything structural on an engine.
The part number follows convention for Caterpillar tools, but an internet search for that number (in it's variations) shows up only a "clip" with p/n 0v0117.
It may come in handy to get at a nut buried deep in a machine, so even if I cannot find information on it, it will stay in my tool box.
The part number follows convention for Caterpillar tools, but an internet search for that number (in it's variations) shows up only a "clip" with p/n 0v0117.
It may come in handy to get at a nut buried deep in a machine, so even if I cannot find information on it, it will stay in my tool box.
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