T5 gearbox noise

[TVR450s]

Good day 😃

Would anyone have had a noise (it's like a wheel rubbing on the body) when in 1st?. Both when pulling away and under engine breaking. Changes in frequency as speed increases. Nothing in any other gear + nothing with clutch depressed + nothing in neutral. G box had its annual oil CX 6 weeks ago. It was my understanding that 5th was the only potential weak spot with this box. Any pointers most welcome.

Thanks.

[Steve_D]

May be worth investigating if the tin cover on the lower front of the bell housing is rubbing on the flywheel.
Have experienced this and it revolves around crankshaft end float which changes with clutch and acceleration.

Steve

[TVR450s]

Thanks, Ill have a look. Would that not also happen in 2nd, 3rd etc?

[TVR450s]

Does anyone have access to a BTR Workshop manual? After this mornings investigation I'm sure its a synchro bearing that's goosed.

[ChimpOnGas]

TVR450s said:

Does anyone have access to a BTR Borg Warner (Now Tremec) Workshop manual? After this mornings investigation I'm sure its a synchro bearing that's goosed.

http://www.tremec.com/anexos/TRSM-T5-0510-R1_173.pdf

[NZ fan]

Did you mean to say t5 workshop manual? BTR would be the diff. (No synchro,s in there)
If so there are vids on YouTube showing how to dismantle a t5 trans. If it's a bearing I would expect it to be noisey in other gears as every gear loads all the shaft bearings in the box apart from 4th which simply locks the input to the output shaft putting no real load on any bearings
So typically when there is a bad bearing there will be some degree of noise in all gears and 4th will be quiet. The t5 does have needle bearings in the centre of each main shaft gear so I suppose if the needle bearing in the centre of 1st is bad you could get a noise just in 1st alone? There is a lot more torque multiplication in 1st gear so the diff bushes are stressed more when you are setting off. You could try hard acceleration in 2nd and see if you can get the noise to occur. Could be the diff touching metal on metal somewhere?

[N7GTX]

Could it be the spigot bush?

http://www.powersperformance.co.uk/store/slug/spig...

I had this and only happened in first as you could not hear it above the engine noise in 2nd or above.

[TVR450s]

All this sun has cooked my brain. T5 not BTR diff.

This mornings drive did reveal the noise in 2nd + possibly third. Its defiantly a gearbox fault. Dropped the oil 3 days ago. Clear with no large debris identified, nothing on the mag chip either. Can anyone recommend a O/haul company or facility?

Thanks

[Dougal9887]

You can rebuild it yourself if you fancy it. No special tools or skills required (I needed expanding pliers for the snap rings and a larger torx socket than I had for the shift lever pivot pin, I also had to split the bearing cones on the countershaft which would otherwise require a special puller to remove them) and all the information you require is in the above manual plus lots of YouTube videos.
The re-build kits are available online from various American sites. As standard you will get upgraded carbon fibre type syncro rings, I also chose to upgrade the counter shaft bearing retainer plate from pressed to machined. Peelable shims are provided to set the preloads.
It's a very satisfying job and the carbon fibre lined sycros rings give a much improved gear change.

[ginkent]

TVR450s said:

Can anyone recommend a O/haul company or facility?

I had my T5 box on my cerb rebuilt by gearboxman aka Competition Transmission Services. 1st class service. Google them.

[TVR450s]

Looks like I have a project to do.....

Thanks all for your help.