33 hub nut size

alchemistry · #1 (**permalink**) 01-09-2008, 05:51 AM

Does anyone know what size the front wheel hub nuts are on an (1990) 33?

Thanks, Al

77SudTi · #2 (**permalink**) 01-09-2008, 07:25 AM

30 or 32mm rings a bell....get the vernier out!!

lenus · #3 (**permalink**) 01-09-2008, 08:57 AM

I think it was a 34/35mm iirc.

It was 1" 1/4.

..

You'll have a nice time trying to undo it though.

I had to use a 3/4" drive socket a power bar and a tail shaft to even move it. And it doesn't break like a normal nut it keeps up the pressure.

Avoid taking it off at all costs if you can!

The only reason you would need to take it off is if you need to change the outer yolk on the cv joint. If it's anything else other then that, remove the whole hub - it's ALOT easier.

lenus.

dave33 · #4 (**permalink**) 01-09-2008, 01:31 PM

When I renewed the rubber CV boots on my race car, (1989 1.7 QV 33) I ended up taking the two whole hubs with driveshafts attached to the suspension shop. I actually broke a 1/2 inch power bar trying to get one of those nuts off.

Not only were the nuts on SOOOOOO TIGHT !!! The driveshafts were also loctited into the hubs and had to be pressed out. Apparently some are "glued" in and some not. (The ongoing variability of Luigi in the factory it seems !!)

IMHO there are some jobs that are best done by a shop with the right gear, and this is one of them !!!

Very best of luck
Cheers
David F

:-)

alchemistry · #5 (**permalink**) 01-09-2008, 03:36 PM

Thanks for your comments. I'm dismantling the car for spares so there's no real reason to seperate the hubs from the drive shafts, can always replace both together if need be. Regards, Al

77SudTi · #6 (**permalink**) 01-09-2008, 04:54 PM

yup, they arent fun to get off, but sometimes the hot spanner is needed (oxy). Also they cn strip the thread as they are undone, worth checking if the tightness doesnt decrease when it starts to move, in which case the nut needs to be cut or split off.

When you replace them, try a little grease....it sure helps the next time!

oz3litre · #7 (**permalink**) 01-09-2008, 05:21 PM

They are 36mm. I couldn't move mine because you can't get the socket in with the wheels on. My Alfa guy does it with a rattle gun. He had to drill holes in the nut on one of mine to loosen it because it was rusted on. The wheel bearing was rusty too for some reason. No wonder it was a tad noisy! The other side came off with the rattle gun. I had a stuffed bearing on one side and a worn CV on the other.

gritsop · #8 (**permalink**) 01-09-2008, 11:30 PM

Hi,

Yes the nut is 36 mm but there is a catch here. Since the hub is conical the outer surface of the nut should be machined so that the nut has more space to slip in the nut/hub.

As far as I know italians do have the tendency to build the hubs in conical form and there is a draw in the 147 manual which describes how much to shave in a 36 mm nut.

I will post the sketch once @ home.

Regards

BigSud · #9 (**permalink**) 01-13-2008, 01:13 AM

"...since the hubs are conical..."

In the words of an infamous waiter from Barcelona: "QUE?"

I've obviously missed something critical in this thread if the hubs are conical.

The only time I've ever had to get one of those nuts off, I had to put the hub back ON to the car to stop it from twisting the vice off the bench...ended up getting seriously grouchy with it and gas-axed the nut off (carefully) since I was replacing the hub and had a spare nut.

Oh, and it was 4 am at the time. Motto - never check your car over before a track day, or you'll never leave the garage!

Chris

gritsop · #10 (**permalink**) 01-13-2008, 03:26 AM

Hi,

As I had promised, here is the sketch

Hope this helps

BigSud · #11 (**permalink**) 01-13-2008, 03:40 AM

AHA!

Thanks for that - it explains quite a lot (like why the sockets never stay on the nut).

I guess that they needed the strength in that piece - it does carry the weight of the car!