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When I last had the Boxercup serviced,I was advised of a mist from an oil seal. Mechanic said it was either clutch push rod oil seal or output shaft oil seal but not to worry as it was only mist but to keep an eye on it. Any advice as to difficulty in replacing - I realise back end will have to come off but that can coincide with getting the sub-frame stoved

All transmission seals can be replaced with the transmission in situ,(Except inner input seal) but, when your mechanic says Clutch Pushrod Seal, Im guessing he is referring to the Input Shaft Seal, the one behind the slave cylinder?
Thats the tricky one as the seal has nothing to bottom against and if its pushed in too far it can interfere with an oil way, you need to measure the depth the old seal sits at before removing and then match it exactly. Also be careful not to damage the lip as it goes over the end of the input shaft.

Output shaft seal is easier as it sits against a flange in the casing but again you need to tape the splines to avoid damaging the lips.

Ive actually got a spare trans in me shed so if you want pictures let me know.

The clutch rod/gearbox oil seal sits behing the slave cylinder, so any misting around here has already meant the paper gasket has been breached and this should be addressed asap. It this seal goes, then gearbox oil will happily travel down the pushrod and find its way onto the clutch plates. The same could happen if the slave starts leaking.
When I changed mine I dont recall any oilway behind it? There is a bearing not far behind it that you have to be careful not to damage when you pull the old one out though. As Timbox says, there is no shoulder for this to butt up against, so you should measure its depth before removal and push the new one in to the same depth.

fatnfast wrote:The clutch rod/gearbox oil seal sits behing the slave cylinder, so any misting around here has already meant the paper gasket has been breached and this should be addressed asap. It this seal goes, then gearbox oil will happily travel down the pushrod and find its way onto the clutch plates. The same could happen if the slave starts leaking.
When I changed mine I dont recall any oilway behind it? There is a bearing not far behind it that you have to be careful not to damage when you pull the old one out though. As Timbox says, there is no shoulder for this to butt up against, so you should measure its depth before removal and push the new one in to the same depth.

The oilway isnt apparent unless you look from the other side, its a slot machined away on the inner face, my spare gearbox is in bits so I can vouch for its existence.

thanks chaps. Timbox2, would be grateful if you could post pics then I'll decide if I can be ar$ed to do it myself or get the spanner chappy to do it

Ok Mate, here you go:



This is clutch slave aperture, oil seal fits right at back in the smaller bore.



This is looking from inside showing oil passage that musnt be obstructed



Showing where Output shaft seal goes.




This shows the wear mark where clutch seal fits on input shaft and obviously the bearing directly behind which you dont want to damage. You can see that you could push the seal all the way up to the bearing but then you would be obstructing the oil way.




This shows similar wear mark on output shaft with bearing directly behind again, but this seal sits against shoulder in casing so easier.



Full view of rear of box for reference. The small aperture centre bottom is where the gear indicator switch sits on the back of the selector drum, there is another small seal there which might be worth looking at as your doing the others.




All the bits inside.

Hope this helps
Tim

thanks for that - it all makes sense now