gear box anti vibration weight

[Z320]

good evening everybody,

I know some TRs have a anti vibration weight on the gearbox,

my 4A IRS didn‘t have one when I bought it 2009, a club mates IRS had one…

On which TRs it was standard, please?

Ciao, Marco

Edited April 4 by Z320

[roy53]

When i fitted one to my 4 it stopped the gearlever rattle,

just for info

Roy

[Z320]

I found this, it seems to be a 4 and 4A issue

 

[StevecTR4]

Hi,

From the parts book. It suggests the weight was fitted to gearbox numbers CT17815 to CT35719.

Not sure how this relates to commission numbers.

I have one fitted to a gearbox and overdrive unit, that I have had in store for a while. 

Finding one on this gearbox, I bought a weight to fit to an early TR4 gearbox I have been restoring, believing it may be missing. Then realised from looking at the parts book, it was not within the number range.

Consider I now have the extra balancing weight. It will be fitted to the restored gearbox. Thinking it can do no harm, now I have it.

Regards 

Steve

[RAHTR4]

Marco,

You have a P.M.

Regards, Richard

[Ian Vincent]

I have had one on my TR3a ever since I put it back on the road but it keeps slipping and ends up in contact with exhaust so I removed it a few weeks ago and will see if I notice the difference.

Rgds Ian

[Don H.]

[rcreweread]

8 hours ago, Ian Vincent said:

I have had one on my TR3a ever since I put it back on the road but it keeps slipping and ends up in contact with exhaust so I removed it a few weeks ago and will see if I notice the difference.

Rgds Ian

Hi  - I've got several of these spare but I haven't got any of the twisted side straps which fit onto the gear lever remote strengthening bracket - looks easy enough to make - can anyone send me any dimensions or got an old one ( any condition) they don't want

Cheers Rich C-R  

[Z320]

Hi Richard,

thank you for your article via PM.

Thank you everybody,

could it be the case all TR2-3 suffered from vibrations,

with the TR4 Triumph introduced the anti vibration weight.

In my opinion the reason is the solid axle.

With the IRS axle things have been improved and the weight was not that much needed.

On the 6 cylindes the rear cover of the diff changed, what could also improved the situation.

I don’t own a TR6 and can‘t compare.

Ciao, Marco

[Chilliman]

1 hour ago, rcreweread said:

I've got several of these spare but I haven't got any of the twisted side straps which fit onto the gear lever remote strengthening bracket - looks easy enough to make - can anyone send me any dimensions

Metal strap 120mm long, 18.8mm wide & 1.5mm thick. Square cut at the end attached to the lump, rounded at the other end.

Hole at the square end is 8.6mm diameter & centered 8.5mm from the end.

Hole at round end is 8.2mm diameter & centered  9.25mm from end.

All the above assuming it is an original - but it looks it.

 

[rcreweread]

John  - brilliant and thanks - just what I need

Cheers Rich

[Z320]

Is this the rear axle of a TR4, please? (the title states this)

 

[Chilliman]

Yes, looks like it to me.

[stuart]

Mine separated the rubber from the steel centre so it was removed but I think I do need to replace it as there does seem to be vibration at certain RPM so if anyone has a good one please be let me know 

Stuart

[Z320]

For a constant speed of the diff ingoing flange two things are needed:

- forks of the propshaft U- joints in line (easy)

- angle of both u-joints the same, im Z or W orientation

On  all TR IRS axles it is fixed in Z orientation, but worth to check and easy to do.

On all TR solid axles it changes massive on the diff in W orientation, only fixable with an additional linkage.

In my opinion the changing angle, by revs and load, is the reason of the fibration and weight.

Ciao, Marco

 

Edited April 6 by Z320

[Chilliman]

8 hours ago, stuart said:

Mine separated the rubber from the steel centre so it was removed but I think I do need to replace it as there does seem to be vibration at certain RPM so if anyone has a good one please be let me know 

You can have one of mine Stuart, I can either post it down to you or hang on until we meet up later in the year if not urgent.

Edited April 6 by Chilliman

[Z320]

Good morning Stuart,

your TR is a solid axle?

[Z320]

A photo posted my Peter W some years ago

[stuart]

3 hours ago, Z320 said:

Good morning Stuart,

your TR is a solid axle?

Hi Marco yes it certainly is, when I was looking for a TR4 more than thirty odd years ago I couldnt find a good one anywhere, (obviously pre internet sales so was relying on likes of Exchange and Mart and early local Auto trader) so as I still wanted a solid axle I bought my one.

Stuart.

 

[stuart]

3 hours ago, Chilliman said:

You can have one of mine Stuart, I can either post it down to you or hang on until we meet up later in the year if not urgent.

Thanks John that would be good.

Stuart.

[stuart]

3 hours ago, Z320 said:

A photo posted my Peter W some years ago

Tramp bars on a TR3A I think.

Stuart.

[Z320]

This bars together with the leaf springs could work like a parallelogramm, 

holding the diff in always the same (and correct) angle?

IMO a bit more the challenge to determain the correct angle on a W-orientation than on a Z-orientation….

Perhaps Peter joins and has more information.

Ciao, Marco

Edited April 6 by Z320

[stuart]

1 hour ago, Z320 said:

This bars together with the leaf springs could work like a parallelogramm, 

holding the diff in always the same (and correct) angle?

IMO a bit more the challenge to determain the correct angle on a W-orientation than on a Z-orientation….

Perhaps Peter joins and has more information.

Ciao, Marco

Yes but it would still go up and down so moving the prop joint angle , in IRS cars with fixed axle the prop joints stay the same angle to each other.

Stuart.

[Z320]

I speculated about this, and this is a problem!

Because on a W-orientation UP reduces the the angle on the u-joint on the diff,

while it ingreases the same moment the angle of the u-joint on the gearbox?

While on a Z-orientation it doesn’t matter?

I don’t know, just a question.

[Dic Doretti]

Anti tramp bars were standard on the Swallow Doretti but mounted above the spring and attached to the top of the U clamps on the axle. The Doretti prototype even had a panhard rod for better axle location.

Cheers Richard