Technical Transmission slip 80SX bravo

[symonh2000]

It does look like a good one

There is no evidence of slippage, if you look at my pics on page 1 you can see my crown wheel had moved away from the raised edge and this had also caused scoring on the crownwheel when it slipped.

Thats great to know.

There is some movement where the input shaft goes in, is that normal?

The box sounds reasonably quiet though when the shaft is turned. I suspect it would be quieter still with oil in it.

I will have to compare it with the old one when it comes off. Hopefully I will be able to do the work next weekend. Weather permitting.

 

[Dan89]

Thats great to know.

There is some movement where the input shaft goes in, is that normal?

The box sounds reasonably quiet though when the shaft is turned. I suspect it would be quieter still with oil in it.

I will have to compare it with the old one when it comes off. Hopefully I will be able to do the work next weekend. Weather permitting.

You mean a bit of backlash or it's wobbly?

 

[symonh2000]

It wobbles from side to side slightly, maybe a couple of mm either way..

If there is something wrong with the box I will swap the diff from this "new" one into the old one.

My dad seemed to think it was ok though, but I am not so sure.

 

[Dan89]

I think a little bit of play will be ok

You might find some 'characteristics' of the new box like I did, it has to be double clutched going from first to reverse and vice versa most times

I also get a 'snick' going from first to second at higher revs

 

[symonh2000]

I think a little bit of play will be ok

You might find some 'characteristics' of the new box like I did, it has to be double clutched going from first to reverse and vice versa most times

I also get a 'snick' going from first to second at higher revs

Hmmm..

I know the old box changes gear fine, it is a bit clunky and shunts a bit in traffic but it is otherwise ok.

It is very tempting to swap the diff over.

Cheers for the help by the way. I owe you a beer or 3.

 

[Dan89]

I reckon you might as well swap it if the old one is ok, better than finding out afterwards something's wrong with the new one and having to swap it back out. Of course if the old box gets worse then you have a spare to try

No problem mate

 

[arc]

don't swap the diff over, different boxes and diffs wear at different rates. start mix-matching them and it'll sound like an electric car afterwards (been there, done that!)

 

[symonh2000]

Right, I have been busy today.

I removed the box, and took the cover off and this is what I found.

http://i13.photobucket.com/albums/a295/symonh2000/Knackeddiff-2.jpg
http://i13.photobucket.com/albums/a295/symonh2000/KnackedDiff-1.jpg

The pin that holds the planet gears has slid out from inside the diff and worn away the diff cover, as well as the bell housing. There was an oil leak into the bell housing where it had worn through.

http://i13.photobucket.com/albums/a295/symonh2000/Wornbellhousing.jpg
http://i13.photobucket.com/albums/a295/symonh2000/Cover.jpg


The ring gear has also been slipping as I suspected.

It was not possible to just swap the box over to the new one, as the input shaft bearing on the replacement box was FUBAR.

http://i13.photobucket.com/albums/a295/symonh2000/Bearing.jpg

So what I did was remove the bell housing from the "New" Box and fit it to the gearbox part of my old box.

I then fitted the diff from the "New" Box to the old box.

Not ideal, but I had to make the most of what I had.

One observation, was that my 1.2 box had roller bearings, where as the 1.4 box had ball bearings.

http://i13.photobucket.com/albums/a295/symonh2000/Rollers.jpg