It happened to me sometimes on cars, put a bit of grease on the screws.

The prop shaft is well centered with the tail of the gearbox shaft ?

If yes, and nothing gets in the way, then you screw the 3 screws and the part will come into place while driving the car.

(if you want, once screwed, you can give some hammer blows to seat the flex disk into position)

 

My 1750 if this helps
Pete

 

OK - if there is no danger of the driveshaft alignment shop having put the giubo on backwards (i.e. you're saying it's impossible to do because there is no direction to the giubo), then I can figure it out.

Normally I would put the disk on the yoke first, then attach it to the prop shaft...easier IMO to keep it all in alignment when you do that. But since it was already on the prop shaft and I'm attaching it to the yoke second, I'll drop the front half of the prop shaft to make it easy to make sure I've got everything in nice alignment.

Thanks guys.

 

Yes, I put the giubio on the yoke first

Pete

 

Just recently reinstalled my tranny and fought for over 20 minutes trying to thread the DS onto the 3 bolts loosely set in the holes. (Giubo was on yoke already. ) So after the anvil figuratively fell on my head , I removed the loose bolts , and threaded them in after the DS went all the way home.If you haven’t already got it by now , I’d definitely try the giubo on yoke first, get your DS around the olive (greased) then thread the bolts through one by one. it will be tight but not as tight as trying to jam all 3 at once, and you’re basically trying to get all 3 now but onto the yoke. Heavy Rubber hammer to tap it off driveshaft and onto yoke. It’s amazing how strong and unforgiving heavy rubber is

 

Thanks for that. I was pleasantly surprised to be able to get the giubo (while attached to the DS) landed to all 3 bolts on the yoke once I got the 3 hose clamps I had lying around to stay in place on the giubo (hence the zip ties in the picture). But with it landed, I have that gap I noted which made me worry about twisting stress on the giubo. Maybe it will all line up nicely once I start tightening everything down.

But it made me wonder if there is a specific directional orientation to the giubo...e.g. one side is supposed to face the gearbox not the driveshaft or certain bolt holes supposed to be used for the driveshaft vs. the yoke. Transaxle cars (Alfetta, GTV6) giubos are like that. But I guess not the case on 105 cars?

 

Thanks for that. I was pleasantly surprised to be able to get the giubo (while attached to the DS) landed to all 3 bolts on the yoke once I got the 3 hose clamps I had lying around to stay in place on the giubo (hence the zip ties in the picture). But with it landed, I have that gap I noted which made me worry about twisting stress on the giubo. Maybe it will all line up nicely once I start tightening everything down.

But it made me wonder if there is a specific directional orientation to the giubo...e.g. one side is supposed to face the gearbox not the driveshaft or certain bolt holes supposed to be used for the driveshaft vs. the yoke. Transaxle cars (Alfetta, GTV6) giubos are like that. But I guess not the case on 105 cars?

When I attempted to catch all 3 ( opposite in your case,my giubo already seated home on yoke) I could get all bolts in the holes but only up to the threads, tightening nor loosening the hose clamp did nothing, worked easily threading one bolt at a time from behind (upstream of yoke) if you have enough thread to catch all 3 nuts you should be fine eventually after wrenching

 

Nope, the giubo is not directional on the 105 cars.

That gap shouldn't be there, you'll need to maybe compress the giubo a bit more with the clamps and it should slide onto the bolts fully (with some encouragement). As Pescara noted make sure the olive on the output shaft is aligned with the top hat bushing in the end of the propshaft. Also ensure the olive/bushing are greased and the rubber collar is in place on the output shaft in front of the olive.

 

OK - that's what I needed...giubo not directional..and the gap is not correct. The bolt pictured is fully seated, so I'm guessing something in this backwards (to me anyway) method of install (donut on driveshaft already...driveshaft assembly installed except for carrier bearing) is giving me a wrong angle. I think trying to do it this way was a fool's errand. I'd not have done this if the donut wasn't already on the shaft from shaft balancing shop and the shaft already in the car.

I'm gonna pull the front part of the driveshaft (already have the trans mount down) so I have a straight shot at the gearbox yoke.

And the tophat and little plastic disk thingy are in the driveshaft and greased. But thanks for the reminder, because I forgot that years ago and I was bummer to pull it all again.

As an aside, Napa parts here in the US carries the 12mm x 1.5 grade 8 nuts for the giubo bolts. May take a day or two for them to get them to the store, but they do carry them. My favorite hardware stores that have fueled my fastener needs putting every part of this car together did not carry them, which was pretty much a first.

 

Autocorrect: "greased". Fixed.

 

I am confused by the need to use the hose clip. I annoyingly had to remove my driveshaft many times and did not have to use a hose clip to get back on. From memory I put the bolts in as far as I could, trying not to swear, and then rotated the driveshaft until a bolt was nicely aligned with the giubio and then pushed it in further and repeated the process. My point is there will be a place where the bolt is happier to go in.

Another reason why the giubio should go on the yoke, not the driveshaft, but of course the driveshaft balancing place only had the driveshaft
Pete

 

I annoyingly had to remove my driveshaft many times and did not have to use a hose clip to get back on.

You need the hose clamp(s) because often, the giubo's bolt circle diameter is > the diameter of the circle that intersects the 3 holes in the driveshaft and transmission yolks. I don't know why giubos can't be made the right size, but I guess better too big than too small. So you compress the giubo down with the clamp(s) until the bolts will slide into place. The steel band that comes with the giubo is supposed to perform the same function, but you can fine tune things better with hose clamp(s).

Maybe PSk's giubo was that one in a million that has its holes at the right circle diameter; I've never come across one that way.

 

Alfa even made a special tool for squeezing down giubos that they could be reused when doing repairs that required their removal. But I'd prefer to have Pete's luck.

 

Why would you change the special bolts?

Pete

 

I’m changing the nuts, not the bolts. And given they are nylock and 50 years old, probably about time. Not to mention they don’t match hence represent a potential balance issue.

 

Honestly should swap the giubo to the tranny yoke first, really don’t need to lower the tranny mount, you’ll have more space to insert the DS ez pz, finagleing the center bearing is the most annoying part , but I think your model year is even easier. Insert one bolt at a time to secure DS. Have fun!

 

I just installed the engine, so I didn’t have the rear mount in permanently anyway. But I may actually swap the giubo on to the yoke since that’s the only way I’ve done it before…we’ll see.

 

BTW I'm not saying the bolts just slid in, I'm saying that turning the driveshaft while working the bolts in makes things much easier.

I think I might have lowered the transmission/gearbox mount. And yes the centre driveshaft bearing is very easy on later cars like mine
Pete

 

You may have solved a long annoying mystery here. Maybe the annoyance of getting these oversized giubos installed comes with a benefit.