Dolly Sprint front Suspension Braket Fastener

[elmefrio]

Hello!

I'm going to refurb my front suspension on my '77 Sprint
(New Polybush, sandblasting components and powder coated, all new nut and bolts etc...)

I'm confused about the suspension bracket to subframe fasteners:

It have 3 x 5/16 upper bolt and 1 x 3/8 lower bolt.

I would like to know the correct length of these fasteners for buy the correct new ones:

Rimmer say 2" and 3/4 for the 5/16 and 3" and 1/4 for the 3/8 one.
Chris Witor say 3" and 3/4 for 5/16 and 3" for the 3/8 one.


I'm a bit confused, which are the correct lenghts?

Thanks in advance for ALL suggestion!

[tinweevil]

Upper 6 off HB822 = 5/16 UNF x 2&3/4" bolt with nylocks* and no washers either side shown in the parts book.
Lower 2 off HB926 = 3/8 UNF x 3&1/4" bolt with nylocks* and a plain washer each side.
The Angle brackets that a car of that age should have on the upper pivot require:
4 off HU808= 5/16 UNF x 1" setscrew with a plain washer each side, a spring washer and plain nut.

* both these Nylock positions have Triumph part numbers rather than Standard fixing identifiers so may well be non standard for the thread size. Generally that means the nut is larger AF than is usually associated with the thread size. The part numbers are 6 off 143082 and 2 off 143804. 'Standard', as in Standard Triumph fixing identifiers for full nylocks are YNxxxx.

That's not clear at all on those Nylocks is it. I'll try to rephrase it in the morning if someone else doesn't defuddle my ramblings by then.

[elmefrio]

I suspect that they are not normal Nyloc (YN code) but "all metal" locking nut like philidas or Aerotight Nuts type?

Something like this:
http://www.nutsandbolts.co.uk/5-16-unf- ... -nuts.html

[Flyfisherman]

I suspect that they are not normal Nyloc (YN code) but "all metal" locking nut like philidas or Aerotight Nuts type?

Something like this:
http://www.nutsandbolts.co.uk/5-16-unf- ... -nuts.html

Nothing special like the above - just a normal nyloc nut.

paul

[sprint95m]

* both these Nylock positions have Triumph part numbers rather than Standard fixing identifiers so may well be non standard for the thread size. Generally that means the nut is larger AF than is usually associated with the thread size. The part numbers are 6 off 143082 and 2 off 143804. 'Standard', as in Standard Triumph fixing identifiers for full nylocks are YNxxxx.

The bespoke nylocs Triumph fitted are deeper ( so have a greater threaded portion).





http://www.chriswitor.com/proddetail.php?prod=TN3209
This is the deeper 3/8"UNF nyloc which is used on Sprints and T2000s for the propshaft flanges and
also on the Dolomite front shocker lower mounting bolt.
(Confusingly TN3209 is 9/16"AF just like the normal 3/8"UNF nyloc.)



I am thinking that 143082 and 143804 are the normal nylocs. Certainly when I have dismantled suspensions these
looked to me to have normal dimensions.




Ian.

[elmefrio]

Hi Ian, thanks for your explanations.

What do you thing about using the "all metal" aerotight nut that I linked previously?

Seems to be more resistant for than the normal nyloc on that application, the description say:

"Aerotight Nuts are a type of all metal prevailing torque self-locking nut. This type of lock nut requires a torque (the prevailing torque) to rotate the nut down the thread. The prevailing torque is the locking feature. The advantages of the all-metal design is that the nut can be used at elevated temperatures (up to 300 C) and is not affected by oil. The finish on the nuts is BZP (Bright Zinc Plating). The nuts are available in metric and UNF threads. The nut can be re-used and still maintain a locking action. To achieve the full locking action of the nut it is recommended that at least two bolt threads should protrude through the top of the nut."

[Mad Mart]

The original nuts for the top 3 (6) bolts weren't actually Nylocs. They were similar to these:-



I believe, after a bit of Googling, they are called "Clevelocs"

[MIG Wielder]

I suspect that they are not normal Nyloc (YN code) but "all metal" locking nut like philidas or Aerotight Nuts type?
l

The only time I've seen Aerotight ( aka Aero-Stiff nuts ) used are on the exhaust manifolds of Lotus 907 / 912 engines where standard brass nuts work loose. You can't use Nylocs here because of the very high temperatures. And they work well, but are expensive.
I think Aero-Stiff nuts would be a bit of overkill for Dolomite front suspension. Even with Nyloc nuts you still need visible threads when the nut is fully tightened.
HTH,
Tony.