Type and size Allen for lower front wishbone

[racpercival]

Hi guys;

What is the size of the T Handle needed for removing the lower front inside wishbone? The bolt that goes into the chassis. Looks like a Torx but not sure?

Thanks!

[SteveG]

That looks like a 12 point NAS bolt with a hole in the center for safety wire. It'd be an imperial 12 point socket size. You might need a thin wall socket.

Steve

[Messenger Racing]

I use a 12 point 3/8 deep socket that I have machined down to fit inside the frame hole. I believe I may have had a car that required a 10mm deep socket with similar modification. I have also seen allen head bolts - yours looks to be as previously mentioned - a 12 point socket - probably 3/8.

The nut on the bottom is also hard to get a socket on. The problem is the hole will be very tight on most sockets and often epoxy has spread into the hole when the floor is replaced making it more difficult.

JM

[Bob Wright]

I use a 5/16" allen bolt with a jet nut- I also turned down a 3/8" deep socket to fit. At the risk of being told its dangerous, I put the bolt in from the bottom- much easier deal with. I'll risk the jet nut doesn't come off.

[kea]

I use a 5/16" allen bolt with a jet nut- I also turned down a 3/8" deep socket to fit. At the risk of being told its dangerous, I put the bolt in from the bottom- much easier deal with. I'll risk the jet nut doesn't come off.

Earlier Van Diemens came that way. But after a couple of my customers had those bolts break in the late 90's, then fall out, the ensuing a-arm release caused off road excursions. So, we started making a change to use a NAS bolt, installed from the top.

[racpercival]

Thanks. Looks like the 12 point wrench may be the key. I’ll try the suggestions and let you guys know. Thanks again!!!

[pacratt]

I'm a Formula Vee guy (since '85)...y'know...1950s caveman technology...
But this kind of stuff fascinates me. (machinist / machine builder for 35+ years).
Please keep us up on what you do and how it works.
Glenn

[Lyngengr]

I use a 5/16" allen bolt with a jet nut- I also turned down a 3/8" deep socket to fit. At the risk of being told its dangerous, I put the bolt in from the bottom- much easier deal with. I'll risk the jet nut doesn't come off.

I do the same thing. The alloy allen bolt is plenty strong enough to take the shear load. Every time I take the front suspension off I replace the jet nut, never had any issues with loosening. A 1/4" drive 3/8" socket will fit into the hole easily, I start the nut with a magnetic pickup, once it is on and not cross threaded, I finish tightening with the socket and a long extension. Doesn't need to be super tight, it is not taking any tension, just shear.