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Cardan shaft spline wear

holty

holty

Tuned and Synch'ed
Joined
Nov 16, 2008
Messages
30
Location
Maryborough Queensland Australia
It's a bit hard to see here ( I can't take pics for crap) but I got a nasty surprise when I pulled the cardan shaft off to inspect and regrease the splines and swingarm bearings. All splines looked as new except for the most painful to replace (dropping engine and pulling gearbox), the gearbox output shaft. There is burring along one side of the spline resulting in a loose fit and around 2mm radial movement at the rearmost point of the universal yoke. Wondering if anyone else has come accross this prob? To me the spline appears to have not been hardened correctly or was too loose to start with.
 

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Hello holty

Yoicks! How many km/miles on the bike?

Too much play in the splines would be a worry and could be making the noises which I've been blaming on the driveshaft shock absorber being inadequate. How did that item seem?

Maybe time to remove my CARC unit again and feel the driveshaft for rotational slack. I've had the CARC off three times and each time greased the splines at that end but never thought to check the shaft for rotational slack at the front end which would have been easy to do then.

What do you intend doing about the loose splines?
 
G day Graham
Bike has done 32000 ks not ridden real hard. Cant say i ve heard any noise coming from driveline but the usual
fuelling issues coming off a trailing throttle combined with this spline wear seem to multiply driveline freeplay. I didn't really check rotational wear because i was more concerned with the side to side up n down movement of the yoke. Bottom line is the 3 other splines look like new and short of replacing output shaft there's nothing i can do but put it back together n enjoy the ride B) Cheers
 
Bill Hagan also had a serious issue with one of the splines. I never really understood exactly what :oops: ... this doesn't happen to be a similar failure I hope?
 
What is the amount of wear? A splined drive will wear. If it wasn't properly hardened, I wouldn't expect you'd get anywhere near 32000 km out of it. From looking at the picture, it doesn't appear to be a large step in the splines. As for 2 mm. of play how much lash is there as new, all parts are machined to a tolerance that must allow them to function correctly under all temp., load conditions. If there is no lash in a drive be it gears or a spline they usually tear themselves up in short order.
FBC
 
Given that there's no way short of dismantling to lubricate the splines, I wonder how long Guzzi expect them to last? I don't recall reading in the pathetic service-manual that the splines need to be accessed and lubricated at particular intervals. 32,000km should see these bikes just about run-in, not worn-out. Mine has rather more than that on it and driveline noises are no worse than when it was new.

Removing the CARC to access and lubricate the rear shaft splines is no big deal, but accessing the front splines is a much bigger mouthfull and is very unlikely to happen in most cases until a failure occurs.

The universal joints themselves appear to be "sealed for life" and so not requiring, nor even permitting further lubrication. Fingers crossed! Now I recall what a pig of a job it was to lube the grease nipple on the front universal of the V11 series bikes........A very competent friend actually rebuilt the front universal so that the grease nipple could be accessed more easily. I just fabricates a special bent nozzle for the grease gun. What beautiful but flawed bikes those V11s are. So glad I traded my 2001 V11 Sport for a Breva. That V11 tried to kill me many times with it's high-speed tail wagging. Lovely looking bike.........
 
Just a thought, what is 2mm. in thou. , could be my inability to visualize small metric measurements well is clouding my sight. I work in imperial measures. maybe it's more slop than I think!
FBC
 
Yup ,it is more than I thought. So does any one know what kind of play would be considered serviceable. There must be some kind of dimensional limits for these parts somewhere?
FBC
 
holty: Whatever became of your spline issue.Just reread this thread as I figure I should grease the drive splines this winter,anyone out there have any recommendations as to a greasing interval I've found nothing in the owners manual or shop man. There is a shop up in Quebec called Montecristo that recommend 10000km for all Guzzis. ( seems their field of expertise is Guzzi, BMW, Ducati and Laverda) Any thoughts are appreciated.
FBC
 
Frost bitten Canadian after i posted at 32000 k i just regreased with a heavy grease n reassembled. All i could do at the time.Only done 'bout 37000 now with no hassles apart from usual driveline backlash. Not gonna let a little thing like that spoil the beautiful ride that the Griso is with PC-5 n proper set-up. I'll certainly be regreasing as often as practical. Stuff the service chart. In my case there is definetly too much play between front yoke n output shaft spline so regular greasing is the only answer to prolong it's life.
 
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