Trailing arm pivot bolts

[mentall]

Does anybody have a tightening torque figure for the trailing arm pivot bolts? Please?

I've looked at the 'S Series Bolts' page here; 9/16" UNF. But under Torque Wrench Settings they're not listed.

Heath's no help. I've looked at several engineering reference sites, but they all need the grade of the bolt, which I don't know.

I'm getting better and better at not being able to find things: could just be me!

Edited by mentall on Tuesday 12th March 10:52

[phillpot]

Those big bolts are basically just a pivot, in my opinion they need little more than nipping up. I certainly wouldn't be tightening them up to the general torque for a 9/16 bolt !

Edited by phillpot on Tuesday 12th March 13:47

[mentall]

Thanks, Mike.

But isn't the bolt intended to clamp the centre tube of the bush between the plates on the chassis, preventing it from rotating? The rubber of the bush providing the rotational freedom as well as linear compliance? Hence the instructions we always get for suspension, to load the springs before tightening the bolts.

Or have I misunderstood the arrangement, and the tube on its bolt is an unprotected unlubricated metal-metal bearing? Even the Mini had a grease nipple, as I remember!

Incidentally, I'm still on bonded rubber bushes (which look fine) at the rear. The front of the car is all polybush.

[phillpot]

I may have this all wrong but...............


With a "Metalastik" bush the inner steel tube is bonded into the bush.

There is not enough rubber between the innner and outer metal parts of the bush to flex as the suspension moves. Even if, somehow, the inner tube could be clamped tight enough to prevent it twisting. My guess is the chassis brackets will bend in and the tube will crush if overtightened?



So the only place movement can happen is between the tube and the bolt, until all the grease or Coppaslip you assemble it with washes out and it siezes up with rust, then the bolt turns in the chassis bracket?

[Adrian@]

Reading directly from the TVR factory fastener torque sheet (in a fax dated 13/03/00) for the TVR S3 (I see no difference in any version of the S) ...Trailing arm to chassis torque is 80-85 lbft, (being rubber...IMHO at ride height). A@

[mentall]

Thanks, Adrian: just what I needed.

Perhaps someone with the knowledge could add it to the wiki? Thanks again!

John

[mentall]

mentall said:

Perhaps someone with the knowledge could add it to the wiki? Thanks again!

Done it! Not too difficult.

[Adrian@]

I had not looked at that before...but I can see that the list is from a Griffith/Chimaera and that my factory fax list is for the S series (S3/S3C)...When I get time (if I can), I will update the complete list. A@

[TVRees]

Adrian@ said:

... I can see that the list is from a Griffith/Chimaera and that my factory fax list is for the S series (S3/S3C)...When I get time (if I can), I will update the complete list.

In the list it says "All rear wishbones to chassis 45-50 61-68". I guess this is wrong and is actually from the Griffith/Chimaera.

How about posting a photo of that factory fax list, for all to see ?

I could try to update the complete list for you, I'm sure that it's not too difficult to do.

[Adrian@]

Done...
Checked and left several that were not on my list but that are the same as on other TVR variants. A@

Edited by Adrian@ on Thursday 14th March 08:30

[mentall]

Good job A!