guzziriders.org - moto guzzi forum Homepage
Forum Home Forum Home > Technical > Small Blocks
  New Posts New Posts RSS Feed - Gearbox not changing up
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Gearbox not changing up

 Post Reply Post Reply
Author
Message
redmunk View Drop Down
Falcone
Falcone


Joined: 31 Oct 2017
Location: London
Status: Offline
Points: 76
Post Options Post Options   Thanks (0) Thanks(0)   Quote redmunk Quote  Post ReplyReply Direct Link To This Post Topic: Gearbox not changing up
    Posted: 27 Jan 2019 at 23:48
So after my V35 ripped the middle out it’s clutch, I replaced it and the front oil seal for good measure. It was also seeping oil from the gear selector shaft so I replaced the O ring while it’s in bits. 

Got it all back together and it wouldn’t shift into 3rd at all. As in, the gear lever physically won’t move up at all...solid. Limped about 300yds back home in second, and when I stopped, the gearlever was jammed solid. 

Pulled the box to bits again and the shift pawl was stuck firmly between the pegs it acts on, with the top of both teeth jammed on the pegs. I unjammed it, checked the return spring and detent ball and all seemed good. Happily went through all the gears with the front half of the gearbox off. 

Reassembled the thing and now it won’t go into 4th. Same problem - the lever won’t move an inch from centre in 3rd gear. It didn’t jam solid this time though, the first three gears work fine but the downshift is a lot more sticky. 

I haven’t moved the eccentric adjuster since I rebuilt it about 6 months ago, and even then I just put it in a random position assuming it would need tweaking but it worked perfectly. 

Before I pull it apart again and throw the gearbox in the bin, anyone know what the problem could be? Only starting happening after the clutch problem. Distorted pawl somehow?
Back to Top
redmunk View Drop Down
Falcone
Falcone


Joined: 31 Oct 2017
Location: London
Status: Offline
Points: 76
Post Options Post Options   Thanks (0) Thanks(0)   Quote redmunk Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2019 at 20:53
Spent a mostly futile three hours playing with the adjuster and got it into a state where it changed into 4th, albeit reluctantly. 

Took it for a longer test run...first upchange past 3rd and it jammed solid again. No amount of jiggling wants to free it up. 

Anyone got any suggestions before I sell the bloody thing and buy a Honda...?
Back to Top
Jerry atric View Drop Down
Senior Member
Senior Member
Avatar

Joined: 24 Nov 2014
Location: Wiltshire
Status: Offline
Points: 2172
Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 07 Feb 2019 at 21:49
Not sure where the selector actually sits in the g/box but could it something as simple as a casing screw thats too long and fouling inside? I know its worlds apart but I had this on a Velocette, took 4 stripdowns before I twigged. It must be something you are doing after the internal setup
Back to Top
Mike H View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 May 2014
Location: East Anglia
Status: Offline
Points: 6094
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2019 at 20:31
Originally posted by redmunk redmunk wrote:

So after my V35 ripped the middle out it’s clutch .... Only starting happening after the clutch problem. ...


Hazard a guess, the clutch failing has caused secondary damage in the gearbox, something is bent or wonky or dented. Just guessing, but too much of a coincidence.

Ouch



"Chicken nuggets don't dance on a Tuesday."
Back to Top
Mike H View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 May 2014
Location: East Anglia
Status: Offline
Points: 6094
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2019 at 20:34
PS: not wanting to change gear, as it normally should, points to something being misaligned so parts bind instead of moving properly.


"Chicken nuggets don't dance on a Tuesday."
Back to Top
Ken-Guzzibear View Drop Down
Moderator Group
Moderator Group
Avatar

Joined: 13 May 2014
Location: Sileby Leics
Status: Offline
Points: 5415
Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2019 at 20:45
get the box to Nigel at NBS that will get it sorted

The Older i Get, The Better I Was
Back to Top
Mike H View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 May 2014
Location: East Anglia
Status: Offline
Points: 6094
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 09 Feb 2019 at 20:52

"Chicken nuggets don't dance on a Tuesday."
Back to Top
johnedwards View Drop Down
Guzzino
Guzzino


Joined: 12 Feb 2019
Location: huddersfield
Status: Offline
Points: 2
Post Options Post Options   Thanks (0) Thanks(0)   Quote johnedwards Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2019 at 17:06
i had a similar problem when i rebuilt my v50 . i had turned over notched plate that locates selecter drum {part Q on dia 109 in handbook } .reversing it cured my problem .hope this helps goodluck
johnedwards
Back to Top
redmunk View Drop Down
Falcone
Falcone


Joined: 31 Oct 2017
Location: London
Status: Offline
Points: 76
Post Options Post Options   Thanks (0) Thanks(0)   Quote redmunk Quote  Post ReplyReply Direct Link To This Post Posted: 12 Feb 2019 at 20:14
Originally posted by johnedwards johnedwards wrote:

i had a similar problem when i rebuilt my v50 . i had turned over notched plate that locates selecter drum {part Q on dia 109 in handbook } .reversing it cured my problem .hope this helps goodluck
Thanks, this sounds exactly like the problem! I’ll strip it again this weekend.

Forgot to mention that the box went through the gears fine with a buggered clutch on the centre stand, which points towards me not doing something right on reassembly. 
Back to Top
Mike H View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 May 2014
Location: East Anglia
Status: Offline
Points: 6094
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2019 at 18:48
A-HA!! Thumbs Up

User error .....


"Chicken nuggets don't dance on a Tuesday."
Back to Top
redmunk View Drop Down
Falcone
Falcone


Joined: 31 Oct 2017
Location: London
Status: Offline
Points: 76
Post Options Post Options   Thanks (0) Thanks(0)   Quote redmunk Quote  Post ReplyReply Direct Link To This Post Posted: 17 Feb 2019 at 19:27
Pulled it apart again and the plate was indeed in upside down - I didn’t notice the chamfer on the side facing the shift drum. All works perfectly now, shifts even better that before thanks to all my messing with the adjuster!

Thanks for your help!
Back to Top
johnedwards View Drop Down
Guzzino
Guzzino


Joined: 12 Feb 2019
Location: huddersfield
Status: Offline
Points: 2
Post Options Post Options   Thanks (0) Thanks(0)   Quote johnedwards Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 19 minutes ago at 16:04
pleased to hear it now works. my plate appeared flat but it must make some difference to selecter location
johnedwards
Back to Top
Jerry atric View Drop Down
Senior Member
Senior Member
Avatar

Joined: 24 Nov 2014
Location: Wiltshire
Status: Offline
Points: 2172
Post Options Post Options   Thanks (0) Thanks(0)   Quote Jerry atric Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 42 minutes ago at 21:41
A nice happy ending
Back to Top
Mike H View Drop Down
Senior Member
Senior Member
Avatar

Joined: 21 May 2014
Location: East Anglia
Status: Offline
Points: 6094
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 15 hours 25 minutes ago at 21:58






Edited by Mike H - 15 hours 21 minutes ago at 22:02
"Chicken nuggets don't dance on a Tuesday."
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.00
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.051 seconds.