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001macdonald
05-18-2013, 10:21 PM
https://www.britishcarforum.com/bcf/asset.php?fid=24396&uid=14720&d=1368929904

001macdonald
05-18-2013, 10:24 PM
What is this opening and should it have a plug or bolt in it? It's just to the rear of the master clutch arm on the bottom.

Gerard
05-19-2013, 05:02 AM
What is this opening and should it have a plug or bolt in it? It's just to the rear of the master clutch arm on the bottom.


Do not plug it, it's a drain hole for any oil or water that gets into the bell housing. Normally it has a cotter pin, also known as a jiggle pin, to keep the hole from becoming plugged.

001macdonald
05-20-2013, 08:34 AM
thanks for the info...Glad I didn't plug it. I had just finished topping up the transmission with Max-Life Oil (20-50) and noticed dripping from the hole. Is it possible to overfill the transmission?

Gerard
05-20-2013, 01:52 PM
thanks for the info...Glad I didn't plug it. I had just finished topping up the transmission with Max-Life Oil (20-50) and noticed dripping from the hole. Is it possible to overfill the transmission?

If you are filling from the filler plug on the gearbox, it's not possible to overfill unless you did it with the nose up. It is possible for the front cover to leak. There is a bolt on cover. if it's loose or if your scroll seal is badly worn, you will lose oil from the front. Front covers are now available with a true lip seal, but you also need to check the input shaft for wear also. A Speedi-Sleeve can be used to restore the surface.

David_Doan
05-20-2013, 02:08 PM
If you are filling from the filler plug on the gearbox, it's not possible to overfill unless you did it with the nose up. It is possible for the front cover to leak. There is a bolt on cover. if it's loose or if your scroll seal is badly worn, you will lose oil from the front. Front covers are now available with a true lip seal, but you also need to check the input shaft for wear also. A Speedi-Sleeve can be used to restore the surface.

Are the new front covers for the ribcase only, or will they also fit on the smoothcase?

Gerard
05-20-2013, 02:24 PM
Are the new front covers for the ribcase only, or will they also fit on the smoothcase?

I've only been able to find the ones for the rib case. To the best of my knowledge, those are the only ones made. The cover will bolt up to a smooth case, but the fork and hence the pivot point on both the cover and fork are different.

David_Doan
05-20-2013, 02:48 PM
That's what I thought. My car has a decent 948 and a wore out smoothcase. I don't want to invest in rebuilding it, but not leaking would be nice in the short term.

Long term is a 1275 or a Japanese motor with ribcase or 5 speed.

David_Doan
05-20-2013, 03:02 PM
If you are filling from the filler plug on the gearbox, it's not possible to overfill unless you did it with the nose up. It is possible for the front cover to leak. There is a bolt on cover. if it's loose or if your scroll seal is badly worn, you will lose oil from the front. Front covers are now available with a true lip seal, but you also need to check the input shaft for wear also. A Speedi-Sleeve can be used to restore the surface.

So if the front seal is worn, how much lower is the input shaft than the fill hole? Safe to run it at that level?

Gerard
05-20-2013, 04:40 PM
So if the front seal is worn, how much lower is the input shaft than the fill hole? Safe to run it at that level?

The scroll seal is not designed to hold back oil when stationary, so even a full gearbox would not leak from the shaft. If the cover gasket is compromised or the nuts were loose, then yes, almost any level is going to cause a drip into the bell housing. The issue is oil accumulating or leaking while the shaft is spinning.