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After a drive, where I park the car the transmission will drop about 100ml or more of gearbox oil (with its distinctive smell), dripping from the bell housing.

This tells me its leaking from the input shaft, however I have never fiddled with the gearbox, so its only an assumption.

This is on the GT Junior, the PO put in a 2litre from a berlina afaik, including its gearbox.

I am taking out the gearbox this weekend.

Two Questions:
1 - Assuming it IS the input shaft seal, how easy is it to replace? Can I just open the gearbox, lift the input shaft slightly, and swop the old seal with a new one?

2 - Any other ideas?

Thanks Guys!
 

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The seal is in the bellhousing so it may just be a matter of seperating the bell from the case after you get the transmission out. If it is a pre-'74 transmission it probably has the long shift rods which protrude through an opening in the bellhousing to activate the reverse light switch. On this type of transmission the o-rings for those rods can (will) also leak and require splitting the tranny case to replace them. The later style transmission with short shift rods doesn't have the o-rings because there is no opening in the bellhousing to leak into. The switch screws into the bell instead of hanging by a bracket. Good luck.

Bill
 

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Thanks for the reply BillS

It is indeed the older style gearbox. Just took it apart - the #2 "syncro gear teeth" looks a bit worse for wear (It grates when changing to 2nd, so was expected), and the oil was fairly gray from all the metal bits :(

The Shaft seal that is on the bellhousing was screwed! So will replace that, and I took the 3 O-rings out, they are worn, and quite hard, so will replace that too.

One question - my trusty local Alfa parts supplier told me to just get 'standard' O-rings to put in there, and I dont have a problem with that, but can anybody tell me the 'official' size for them? I do have the old ones to take in as samples, but would like to back that up with numbers.

Thanks!

Oh, and one more thing - the 3 shift rods has got a ball-bearing next to each O-ring, so its obvious how they go together. But at the back, 3 'long' ball bearings (like needle bearings, just rounder at the edges) fell out. There are 3 holes in the shell casting, do I just shove the 3 into those 3 holes?
 

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But at the back, 3 'long' ball bearings (like needle bearings, just rounder at the edges) fell out. There are 3 holes in the shell casting, do I just shove the 3 into those 3 holes?
Sounds like the interlocks. They prevent selection of more than one gear at the same time. They fit between the shift rods as per the attached pic (part number 101.00.13.506.00).
 

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