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Open hole on Transmission

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001macdonald

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Gerard

Gerard

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001macdonald said:
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.
Click to expand...


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.
 
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001macdonald

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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?
 
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001macdonald said:
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?
Click to expand...

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.
 
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Gerard said:
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.
Click to expand...

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

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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.
 
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David_Doan

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Gerard said:
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.
Click to expand...

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?
 
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David_Doan said:
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?
Click to expand...

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.
 
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