Which way round for oil seal on inner TDU bearing ?

[R34ME]

Sounds like the front bearing TDU is around the wrong way, it needs an oil supply ............replace it 8) You may also want to replace the housing the later one is machined deeper to allow more room for the bearing, preload was compromised by the original part.

 

[apollo3]

Currently in the middle of overhauling the transmission of a 2005 model due to falling out of 2nd gear when coming up to corners by fitting the modified 2nd gear and dog ring and have been taking a close look at everything else in there, good thing I did, the bolt holding gearchange arm to gearchange shaft assembly was finger tight due to loctite only on the upper unused part of the thread, and the large thick washer with internal hex headed bolt going through it holding the alternator rotor to the crank was fractured in 3 places, please check these if you do a similar job yourself.

My question is does anyone know which side of the TDU inner bearing has the seal fitted ? I noticed the bearing on the other side of that oil pressure fed housing (rear bearing on input shaft) has the seal on the outer side while the TDU inner bearing has the seal on the inner side - is this correct, the shop manual does not show the set up in any detail.

This may be useful
http://www.photoshow.com/watch/cc6cy9YG

 

[apollo3]

Thanks, there are 2 interesting pictures there, one with the seal on the end and one without !
Which is correct ?

The picture in the sequence headed "bearing fitted wrong way round" shows the seal, when fitted this way it reduced the amount of oil being fed to the bearing through the hole in the bearing housing.
When correctly fitted the bearing is "open" to as much oil delivery as possible and the seal retains some oil in the bearing.

Hope this makes sense.
Regards Jerry.

 

[apollo3]

Thanks Jerry , but I think oil under pressure is fed into the cavity between the 2 bearings (TDU inner and input shaft rear bearing) from an internal oil gallery, and the hole you can see in the housing is to allow the supplied oil access to the rear of both bearing housings and is not actually the sole feed.
The other side of the hole is the rear bearing of the gearbox input shaft.
My motor bottom end is completely apart and using an air line I could understand a bit more how it works, but knowing this, which way round would you now fit the TDU inner bearing and seal ?
Or have I misunderstood your description ?

Hi Mark, with the bearing correctly fitted to the shaft the seal will be "hidden" by the gear, and the bearing "open" side will be fed through the hole in the housing by "splash". I understand what you are saying, and I actually rang the Triumph factory and spoke to the tech. guys to confirm it was correct.I did not/do not really understand why the bearing needs a seal at all on either side but Triumph seems to think it is neccessary "to retain some oil" (quote)
Hope this is useful.
Rgards Jerry.