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 Moto Guzzi Shaft Drive

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Buellbloke
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Buellbloke


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PostSubject: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Tue Dec 07, 2021 6:33 am

By all accounts and purposes they claim them unserviceable, and they are right well at least where the basic home mechanic is concerned.
Once the universal joint/bearing is fitted it cannot be removed, short of burning it out with a blow torch... untrue.
Melt the centre then push the bearings out... give it to an engineer they know how to remove it.

Unless someone knows otherwise? thankfull yes they do.

Mine was super tight on one axis but smooth on the other front gearbox end.
Rear is fluid and smooth.
Upon pressing the stiff bearing both ways it freed it up but showed the bearings were shagged.
Did the same with the fluid moving axis and it was still fluid and smooth.
There is insufficent room to push the bearing beyond the outside of the unit by more than a few mm.
That still leaves three quarters of the bearing in its recess.
You need to be able to remove the bearings two caps to release that side of the bearing from its structure.

So Pete what would be the symptoms of a stiff on one axis Universal Joint gearbox end any clues please ?
On a car it would refuse to steer in that direction or would be very heavy I know this as had one fail on the vectra.


Last edited by Buellbloke on Wed Dec 15, 2021 12:51 am; edited 1 time in total
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Pete Roper
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Tue Dec 07, 2021 11:04 am

We rebuild them regularly.

Once they seize the bearings disintegrate and the cups get beaten to pieces. Once that happens the yokes are shagged and you need a new shaft.

I suggest you take it to a prop shaft rebuilding specialist if such places still exist in the UK.
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Buellbloke
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Tue Dec 07, 2021 12:47 pm

Pete Roper wrote:
We rebuild them regularly.

Once they seize the bearings disintegrate and the cups get beaten to pieces. Once that happens the yokes are shagged and you need a new shaft.

I suggest you take it to a prop shaft rebuilding specialist if such places still exist in the UK.


Its only done 13thou thats like 22k to you in OZ. Stood a lot though.
Also had a 2 thou shim fitted on the knackered axis, nothing on the other side, could have so am informed thrown it off balance?
To buy a good used one from Gutsibits is £160 plus shipping, in the EU they go for similar up to £180.

How do you remove the UJ?

Place around the corner rebuilds axles and diiffs maybe they might sort it. Nope too busy and lacked confidence to inspire me to trust them with it.
Could be cheaper than £120 - £180, would rather keep my own as rear is perfect.
Yeo and Smith engineering been around since just after world war 2, these guys are long retired.
Local Number 01752/262776 No website and no mobile number is quality old skool.
£55 for an hours labour to remove and replace, they can source the bearing for extra though prefer being a bike you supply it which I did.
£40 with a nipple Italian build from specialist prop builder, him below.


Last edited by Buellbloke on Wed Dec 15, 2021 1:35 am; edited 6 times in total
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eeyore
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Thu Dec 09, 2021 3:50 am

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BrianD
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Thu Dec 09, 2021 4:48 am

very useful to know - for the future - if I knacker the UJ.

Of course a CV joint conversion would be nice Rolling Eyes
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Buellbloke
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Thu Dec 09, 2021 5:26 am

There is a lot of specialists in the UK doing propshafts none in or near Plymouth.
My local engineering firm who have been around forever, a place have had valve guides for GS1000's fitted and other stuff seemed really keen to jump on it.
Have got a decent used one lined up to for £160 should they fail to remove the UJ.
The UJ's themselves seem to go anywhere from £30 -£50 on average though obviously you can pay over £100. Lots of different varieties even ones specific for Guzzi's (no stock) though staked or crimped should be avoided in the case of the GRiSO as circlip.
The thing you have to realise is if you go to a specialist you could pay more than the £250 they cost new.


Last edited by Buellbloke on Wed Dec 15, 2021 1:38 am; edited 2 times in total
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lcjohnny
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Thu Dec 09, 2021 5:42 am

eeyore wrote:
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" we cater for all sizes...... to the Sunbeam S8

lovely
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Buellbloke
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PostSubject: Re: Moto Guzzi Shaft Drive   Moto Guzzi Shaft Drive Icon_minitime1Tue Dec 14, 2021 7:50 am

eeyore wrote:
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Spot on the Money  Cool



Turns out the UJ is 19mm Diameter and 48mm length.
It's not a rare UJ though the only place to have stock was "davemacprops" above.
It's also possibly worth mentioning it's made in Italy  Cool
Price was £40 inc shipping, comes with circlips and an almost inaccessible grease nipple.
Actually scrub that try to avoid buying UJ's with a grease nipple, there aint enough space to fit the f*cker in let alone access it after.

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The part with the splines is actually 48.3mm just and the main body (shaft) 48mm.
The UJ being an assembled part comes in around 48.1mm though thats probably the grease.
Moto Guzzi in their infinite wisdom stuck a 3thou shim on one end of the splined bit to make up the space instead of putting a 1 thou shim at either end.
The end result was the bearing was pushed off centre and slowly began to seize.
Defo worth checking yours if you ever service your swing arm bearings.

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Any experience of shims fitted on top of UJ bearings on GRiSO's Pete?


My local been around since the end of the 2nd World War Engineering Firm were keen to do the job.
£55 all in removed and refitted, I supplied the new UJ and shims.
Total price £95 as opposed to £160 plus shipping for a used good one from Gutsibits.
It's more satisfying getting something sorted than replacing it with something else used.
Would have preffered to remove and refit myself, only don't posses the one off use quite expensive tools.
Plus I struggled like f*ck removing the thing using the bench press I used to unseize my pivot bolt.
Sod knows how the Engineers got it out without destroying the thing, but then they are engineers and am just a f*cking Ape  Laughing


My knackered UJ and 2thou shim.

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