steering wheel hub nut

[Takinko]

Does anyone know the size of the nut for the steering wheel hub in 105, specifically early (1970) 1300 GT Junior ? I cannot measure the diameter as it locates deep in the hub. I cannot find anything documented. I need to buy a socket wrench, but I don't want to change if not fit. I thought it would be 26mm?

[Luna Rossa]

I used a 27 mm socket to take the steering wheel off my 1970 GTV. I see no reason why it would be any different for a Junior of the same vintage.

Goodluck.

LR

[Takinko]

Thanks, Luna Rossa,

Yes, it was 27mm. However, I cannot pull out my boss (GTA Hellebore aluminium boss). I would like to change to Momo. Does anyone know how to pull? need a special tool for that? Or just ordinally puller or something? I just don't want to break it.

[1750GTV]

There are a pair of threaded holes in the boss that take a pair of long metric bolts (?? 8mm) which then attach to the puller.

I've attached a photo of a specific 105 series puller, but you can adapt any ordinary one to do the job.

Chris

[Luna Rossa]

I used 5 mm diameter bolts with a steering wheel puller bought from an auto accessory shop because None of the bolts that came with the puller fit.

The 5 mm bolts.

[Takinko]

There are a pair of threaded holes in the boss that take a pair of long metric bolts (?? 8mm) which then attach to the puller.

I've attached a photo of a specific 105 series puller, but you can adapt any ordinary one to do the job.

Chris

Does this 105 specific steering wheel puller apply to GTA Hallebore steering wheel/boss? I measured the bolts and they are 4mm. If it is that difficult to pull out, how hard to put it back? Use of soft hammer or something to push in?
Sorry for my lack of knowledge. I appreciate your help.

[cjheath]

It goes back pretty easily, I seem to recall. There's a keyway, and I think the shaft might be tapered(?). Either way it's not a problem to refit, but make sure you put the key into the keyway, if I recall correctly (25 years ago) the wheel and shaft are both slotted and the key may be a wedge. Someone will have a more recent memory though, I'm sure.

[Takinko]

Today I tried to remove with an ordinary steering puller bought at an auto shop (it was only $5 ). The bolts for Hellebore boss is 4mm, so I also got two high tensile bolts with various diameter washers as the head of the 4mm bolt is too small to fit in the puller slit. I found several AlfaBB threads describing how to pull the wheels and complications. The idea of leaving the nut at the top of the shaft was really good. I did it safely. It was relatively easy job, but if I didn't know how, it would be very difficult and might damage the steering shaft or boss or both. I would like to fit a momo steering wheel, but still waiting for the boss to arrive (steering wheel extender and the wheel itself are here). I will see how difficult to fit in. Hopefully it will not be that bad as  cjheath said. Thank you guys.

[1750GTV]

I'm pretty sure that the 105 models have the index key built into the top of the steering shaft with an appropriate indent on the Hellebore wheel. The earlier models (750 & 101) used a woodruff key.
Chris

[colcol]

Looks similar, but not the same as my 33, made up a plate about 10mm thick, length was what would fit in the recess of the steering wheel hub and the width was about 15mm, [this is what i had lying around], drilled the 2 bolt holes to match the steering wheel, the holes in mine were 6.5 mm diameter, yours are 4.5mm diameter, then with 2 - 6mm cap screw thru to the steering wheel hub and the flat steel resting on the steering column shaft, put your knees behind the steering wheel and do up the cap screws, once you start to move it, it should come free, made this tool up in about 20 minutes, rough as, but does the trick, everytime the wheel has to come off, that is about once a year, Colin.