Failure upshifting from 2nd gear

If you need technical information or help with your early crossover gearchange squarecase Ducati 860/900 engine - post your FAQs, comments & questions here.
Post Reply
VINCENT75
Cucciolo - the Lil Pup
Posts: 8
Joined: Fri Jan 13, 2012 10:41 am
Location: Concord CA

Failure upshifting from 2nd gear

Post by VINCENT75 » Wed May 23, 2012 11:58 am

Recently I had my 75 860GT out on a ride and could not shift from 2nd to 3rd after a few miles.
Downshifts ok.
When first starting out for a miles, all shifts up and down thru the gears is fine but after a while.....no upshift.
This has started only recently.
I was thinking it has something to do with the heating of the clutch after a few miles.
Also very difficult to shift into neutral.
I am going to replace the clutch cable and check the throw adjustment of the linkage rod/balls/rollers.
Any other ideas?

Thanks for any comments

User avatar
abmartin
SSD900 Darmah
Posts: 357
Joined: Tue Apr 10, 2007 4:08 pm
Location: New Brunswick, Canada

Re: Failure upshifting from 2nd gear

Post by abmartin » Wed May 23, 2012 1:33 pm

Replace the gearchange return spring and see if that makes a difference. They are prone to weakness and breakage at regular intervals.

Bruce
1979 900SS
Fredericton, NB
Canada

VINCENT75
Cucciolo - the Lil Pup
Posts: 8
Joined: Fri Jan 13, 2012 10:41 am
Location: Concord CA

Re: Failure upshifting from 2nd gear

Post by VINCENT75 » Wed May 23, 2012 3:34 pm

thanks Bruce
I'll look into the spring condition.
Would it allow normal operation at first then cause the problem after engine/clutch
gets warmer after a few (5) miles?

ducadini
750 Sport [BEVEL]
Posts: 214
Joined: Sat Jul 31, 2004 8:54 am
Location: Antwerpen

Re: Failure upshifting from 2nd gear

Post by ducadini » Wed May 23, 2012 3:47 pm

I don't think the separate gearselector will get THAT warm so that shifting becomes difficult.
The rods-n-balls set could cause the clutch to act strange.

cu
ducadini
Nego i ricordi peggiori
Richiamo i migliori pensieri

wdietz186
888
Posts: 671
Joined: Sun Sep 10, 2006 4:40 pm

Re: Failure upshifting from 2nd gear

Post by wdietz186 » Wed May 23, 2012 5:54 pm

If the shifter spring is broken the lever won't return to the center position,it will feel loose. Possibilities are the spring or the ratchet mechanism in the shifter box is binding from dried out/nonexistent lube or maybe the eccentric adjuster for the lever travel is out of adjustment[not too likely]. Other than those things, what's left is internal,shift drum,forks,worn out dogs that will require the cases come apart.

VINCENT75
Cucciolo - the Lil Pup
Posts: 8
Joined: Fri Jan 13, 2012 10:41 am
Location: Concord CA

Re: Failure upshifting from 2nd gear

Post by VINCENT75 » Wed May 23, 2012 6:53 pm

Thanks all!
I will check the gear selector assy for proper operation/lube.
Anything specific to look for?
I believe I can investigate the proper operation of the shifter drum and forks by removing the gear
selector assy and rotating the shifter drum manually and run thru the gears. At least that will stop me worrying about
the internal bits.
Pardon my ignorance but what is the purpose for the little M6 eccentric screw (0400.13.160) in the
gear selector assy?

wdietz186
888
Posts: 671
Joined: Sun Sep 10, 2006 4:40 pm

Re: Failure upshifting from 2nd gear

Post by wdietz186 » Thu May 24, 2012 5:42 am

That is the eccentric I mentioned. It is used to adjust the lever pawl position so you have equal travel in each direction of the lever swing. It makes some difference but it probably isn't causing your problem.

radecal
Parallel Twin
Posts: 102
Joined: Thu May 18, 2006 6:40 am
Location: Australia

Re: Failure upshifting from 2nd gear

Post by radecal » Wed Jun 13, 2012 2:44 am

Hi Vincet75,
Have been having similar issues with my MHR Mille. Been off road for a while and took her for a run the other day and it would only change 1 through 3 gears and no more. Same as you, up and down to 3 only. I pulled the covers but can't find any issues with the shifter mechanism so now face an internal look. Used an inspection camera but couldn't see anything out of the ordinary so will change the shift springs and reset the adjustment and if that fails, split cases here we come. Will let you know how I get on.
Regards,
RAD

ducadini
750 Sport [BEVEL]
Posts: 214
Joined: Sat Jul 31, 2004 8:54 am
Location: Antwerpen

Re: Failure upshifting from 2nd gear

Post by ducadini » Wed Jun 13, 2012 7:52 am

You could unscrew the bolt at the rear of the cases, lefthandside.
That's the positioning bolt-spring-ball that holds the gear-drum into position.
Could be that this combination is a bit rusty.
If the engine has been standing for a long time, the forks can bind on the pins, preventing further movement.
Always remember that going through the gears with a dead engine isn't easy : keep spinning the shafts.

cu
ducadini
Nego i ricordi peggiori
Richiamo i migliori pensieri

radecal
Parallel Twin
Posts: 102
Joined: Thu May 18, 2006 6:40 am
Location: Australia

Re: Failure upshifting from 2nd gear

Post by radecal » Thu Jun 14, 2012 3:52 am

Haven't checked the positioning bolt-spring-ball setup yet. Intend having another close look at the output shaft as I had changed the rear sprocket prior to the parkup but don't remember giving it any undue whack. Currently away from home so have to wait until the weekend to have a look.
Trying everything I can to avoid splitting the cases. Will keep everyone informed of outcome.
Regards,
RAD

ducadini
750 Sport [BEVEL]
Posts: 214
Joined: Sat Jul 31, 2004 8:54 am
Location: Antwerpen

Re: Failure upshifting from 2nd gear

Post by ducadini » Thu Jun 14, 2012 10:20 pm

The most common mistake after working on chain related things, is the wrong positioning of the gear selector.
The flat on the outshaft of the gear-drum should be horizontal and gearbox should be in neutral.
Be sure the gear selector is also in neutral position and fit it.
Put one or the other in the wrong position and You can only use 3d, a false neutral and 4th.

Since Your's is a crossover engine, be sure to check thecoupling between the shaft and gear selector.
They should be aiming straight at eachother for best performance.
Check for wear.

cu
ducadini
Nego i ricordi peggiori
Richiamo i migliori pensieri

User avatar
BevHevSteve
SITE OWNER
SITE OWNER
Posts: 2119
Joined: Wed Mar 10, 2004 8:53 pm
Location: Lafayette, California
Contact:

Re: Failure upshifting from 2nd gear

Post by BevHevSteve » Fri Jun 15, 2012 7:27 am

"The flat on the outshaft of the gear-drum should be horizontal and gearbox should be in neutral.
Be sure the gear selector is also in neutral position and fit it."

This is probably the best jewel of info everyone should save....
Image
Steve Allen (925)798-BEVL[2385] Ride'm, Don't Hide'm
Ducati/Euro Spares -> https://Store.BevelHeaven.com
Facebook > http://facebook.com/Bevel.Heaven
Twitter > http://www.Twitter.com/BevelHeaven

ducadini
750 Sport [BEVEL]
Posts: 214
Joined: Sat Jul 31, 2004 8:54 am
Location: Antwerpen

Re: Failure upshifting from 2nd gear

Post by ducadini » Fri Jun 15, 2012 11:26 pm

You're right Steve, I shouldn't have mentioned it.
I've fitted it the wrong way a few times and I'm sure better mechanics have done it also.
I was wrong in assuming that people make those mistakes ( and doing so giving me the chance to buy cheap Ducatis and Laverdas) and wrong in assuming I was able to explain what could be wrong.
Next time I can try goegel translater :-)

Now : three more night-shifts and then off to WDW, a bit of wine, a lot of sunshine and a couple of days in the Alps.
Sure beats hammering the keyboard about bevels :-)

cu
ducadini
Nego i ricordi peggiori
Richiamo i migliori pensieri

Post Reply

Return to “Squarecase Early 860/900 Crossover Gearchange Engines > 860/900 GT”