Antonio 1 Posted February 15 Report Share Posted February 15 2004 Ballabio with close to 40K. Pretty sure this is not supposed to do this. I thought it was the clutch at first, but the driveshaft turns while in gear but the rear wheel doesn't. I pulled my rear box off and found the 32 bevel gear spins on its axis. Did I shear a key? Has anyone seen this before? I don't drag race all the time... I haven' been able to find the part. I may buy a complete assembly and rebuild. Does anyone have any thoughts? thanks in advance. VID_20210118_151646469.mp4 Quote Link to post Share on other sites
footgoose 941 Posted February 15 Report Share Posted February 15 wow. Just looking at my spares I'd say if the splines haven't sheared off on the flexible coupling disc #11 below, (not likely) then I'd say the paddles on the flexible coupling disc have sheared off #11 below (same piece) I don't see where else it could spin like that. otherwise it has to be a shaft key. (I am not familiar with this broken apart) can you break it down a bit more to have a look? Quote Link to post Share on other sites
Antonio 1 Posted February 15 Author Report Share Posted February 15 Hi, nothing in the wheel is turning. It is only the big bevel gear (#29) that is spinning on its shaft Quote Link to post Share on other sites
Antonio 1 Posted February 15 Author Report Share Posted February 15 the red arrows turn independently from the blue arrows Quote Link to post Share on other sites
Antonio 1 Posted February 15 Author Report Share Posted February 15 Here is one more video. I will get back tomorrow. Need some sleep.... VID_20210214_212411140_3.mp4 Quote Link to post Share on other sites
Lucky Phil 1,910 Posted February 15 Report Share Posted February 15 I would say that the gear and shoulder is a shrink fit on the shaft and its moved then eventually released. Ciao 1 Quote Link to post Share on other sites
MartyNZ 424 Posted February 15 Report Share Posted February 15 On 2/15/2021 at 6:15 PM, Antonio said: the red arrows turn independently from the blue arrows Wow, that's a nuisance. I have a pair of bevel boxes apart at the moment, and noticed that the crown wheel and bearing inner race are pressed onto the shaft/output spline. I even thought about separating the crown wheel off one shaft to fit to another shaft with an unworn output spline, thinking it may avoid the tricky job of shimming and setting backlash. But no. Anyway for your problem. Bevel boxes in earlier Guzzis have a ring of big bolts that indicate high loads in the joint that failed on your shaft. Bearing retainer or epoxy may not make a strong enough bond. Brazing may work if your expert can avoid affecting the heat treatment of the teeth and spline. Otherwise you are facing replacement of the CW & pinion as a pair (or the whole thing). 1 Quote Link to post Share on other sites
gstallons 768 Posted February 15 Report Share Posted February 15 T don't think I would buy a used R&P gear set & I don't know how much new is . It may be best (if it is a good price) to buy another assy. from someone parting out V11s . Keep us posted . 1 Quote Link to post Share on other sites
bbolesaz 173 Posted February 16 Report Share Posted February 16 Looks like part #29 is splined and the splines have been ground off. The photo, looks like spline remains above the blue arrow closest to the gear. Quote Link to post Share on other sites
Lucky Phil 1,910 Posted February 16 Report Share Posted February 16 12 minutes ago, bbolesaz said: Looks like part #29 is splined and the splines have been ground off. The photo, looks like spline remains above the blue arrow closest to the gear. No thats just a reflection of the gear teeth. The whole unit is an assembly. Ciao 1 Quote Link to post Share on other sites
bbolesaz 173 Posted February 16 Report Share Posted February 16 Press fit? Quote Link to post Share on other sites
Lucky Phil 1,910 Posted February 16 Report Share Posted February 16 My suggestion upon reflection is to have the shaft hard chromed to a build up of probably around .004" ( I'd need to research that) Ping Chuck! and then shrink fit it back on again. Plenty of engine stuff these days use shrink or interference fit for things such as engine driven balance shafts and cam sensor wheels etc. Ciao 1 Quote Link to post Share on other sites
Lucky Phil 1,910 Posted February 16 Report Share Posted February 16 3 minutes ago, bbolesaz said: Press fit? Yes probably or shrink fit. Same interference fit by a different process. Ciao Quote Link to post Share on other sites
Antonio 1 Posted February 16 Author Report Share Posted February 16 18 hours ago, Lucky Phil said: My suggestion upon reflection is to have the shaft hard chromed to a build up of probably around .004" ( I'd need to research that) Pink Chuck! and then shrink fit it back on again. Plenty of engine stuff these days use shrink or interference fit for things such as engine driven balance shafts and cam sensor wheels etc. Ciao Thanks everyone. I like this option as a starting point. I'll let you know how it goes. Cheers. 1 Quote Link to post Share on other sites
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