Need help with the left nut

[HRM]

Trying to loosen the nylon locknut (5/8") on the lower engine mount (see photo) on the pilot side. Any suggestions on how to get at this? We've run out of ideas to include long-reach angled needle-nose pliers.

Edited December 6, 2019 by HRM
added nut size

[RLCarter]

Thin wall socket?

[HRM]

11 minutes ago, RLCarter said:

Thin wall socket?

Tried. Did you have success with one? Not all are created equal. It's at a weird angle in there.

I think the problem is that 5/8" sockets are made 'hefty' to accommodate the torques possible on that sized hardware. To get on that nut you thin and long (in terms of the handle holding the socket). <sigh>

[Pasturepilot]

6 minutes ago, HRM said:

Tried. Did you have success with one? Not all are created equal. It's at a weird angle in there.

I think the problem is that 5/8" sockets are made 'hefty' to accommodate the torques possible on that sized hardware. To get on that nut you thin and long (in terms of the handle holding the socket). <sigh>

Different brands have different thicknesses. Cornwall was often much thicker than Snap-On, for instance. If you’ve got a mechanic handy with different brands of sockets, you might try that route. 

[N201MKTurbo]

I ground down the box end of an end wrench till it fit. Use a socket on the bolt.

[RLCarter]

6 hours ago, HRM said:

Tried. Did you have success with one?

I've replaced the mounts on my "E" but don't remember having any issues using Snap-On wrenches & sockets.... I've turned down the O.D. on several sockets in the past, lathe works best but a grinder works as well

[HRM]

2 hours ago, RLCarter said:

I've replaced the mounts on my "E" but don't remember having any issues using Snap-On wrenches & sockets.... I've turned down the O.D. on several sockets in the past, lathe works best but a grinder works as well

Thanks! I am starting to see a pattern develop here, the Snap-On wrenches apparently are slimmer and fit into tight spaces easily. There is just absolutely no room for less than the tightest fit. I am probably going to have to grind something down to get up in there.

[RLCarter]

23 minutes ago, HRM said:

Thanks! I am starting to see a pattern develop here

Lycoming might have stock in Snap-On 

[Guest]

Any reasonable quality box end wrench ground down to thin the box will fit in.  Snap On wrenches will fit with no grinding.

Snap On OEX series wrenches( short but not stubby length)  are your best friend in airplane maintenance.

Clarence

[RLCarter]

46 minutes ago, M20Doc said:

Snap On wrenches will fit with no grinding.

Had most of my Snap-On hand tools for over 40+ years.... From the age of 16ish till I was 25ish, the Snap-On guy got at least$20.00 a week.....lol...Money well spent