TR5/TR250 TR250 Steering Column Assembly

[angelfj1]

Do I really need this special tool?

See diagram and excerpt below. Considering that I have never seen let alone own a <span style="font-weight: bold">1/8" Unbrako hexagon wrench</span>, I assume that this is a tool which limits the torque at which the allen screw is tightened.

What can be used as an alternative and is this a safe approach?

 

[Andrew Mace]

Do I really need this special tool?

See diagram and excerpt below. Considering that I have never seen let alone own a <span style="font-weight: bold">1/8" Unbrako hexagon wrench</span>, I assume that this is a tool which limits the torque at which the allen screw is tightened....

Actually, "Unbrako" appears to be nothing but a British brand name (like Craftsman)! I'll assume any Allen wrench (like Craftsman) will work.

 

[angelfj1]

So, Andy would you say that the tightening torque is not critical?

Thanks

 

[Andrew Mace]

I don't have any of my manuals in front of me at the moment, but that's pretty much the case. <span style="text-decoration: line-through">However, in some Herald and Spitfire factory manuals, there is mention of a somewhat particular torque setting to enable/preserve the "telescoping on impact" feature of the (<span style="font-style: italic">Impacto-scopic</span>) design. If no one else gets to it before I do (later this evening), I can check on that.</span>

<span style="color: #FF0000"><span style="font-style: italic"><span style="font-weight: bold">Please see correction to above in post below!</span></span></span>

 

[ichthos]

I have a 69 TR6 with the same set up. I just got through doing this in June. I am no expert, but the allen wrench worked perfectly. I did not use a torque wrench for this and 5,000 miles later it is still working fine.

Kevin

 

[Andrew Mace]

[In] some Herald and Spitfire factory manuals, there is mention of a somewhat particular torque setting to enable/preserve the "telescoping on impact" feature of the (<span style="font-style: italic">Impacto-scopic</span>) design....

Oh well, chalk it up to old age; I'm afraid I misremembered that part of the Manual. Several other manuals simply state "...tighten the screw...by hand as much as possible without bending the [Allen] wrench. Tighten the locknut."

What I was thinking about, though, turns out to be "NOTE: The column will be unable to telescope if adjusted to its lowest position."

 

[TRDejaVu]

On the 4 I did mine with a regular Allen key and a wrench. No problems in 3 years.

 

[angelfj1]

Thanks guys!

 

[Don_R]

Yes, Unbrako is a brand of Allen wrench. I have full sets of them at work. My employer was stocking them in our tool crib.

 

[angelfj1]

Do I really need this special tool?

See diagram and excerpt below. Considering that I have never seen let alone own a <span style="font-weight: bold">1/8" Unbrako hexagon wrench</span>, I assume that this is a tool which limits the torque at which the allen screw is tightened.

What can be used as an alternative and is this a safe approach?

Just got this clamping arrangement apart this morning. I had to escape the heat and humidity for a while as it's about 85F and maybe 90% rh.

<span style="font-weight: bold">You may want to make a notation in your workshop manuals because the 1/8-inch hex is actually a 3/16-inch hex (at least on my TR250).</span> :madder:

Can someone measure and concur, please.

Thanks

 

[mallard]

It's 3/16 on my TR6

 

[angelfj1]

Thanks Keith!!!