Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 16th April 2020, 11:46   #1
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,516
Thanks: 395
Thanked 823 Times in 652 Posts
Default Noisy 3rd to 2nd manual gearbox

Replaced my daughter’s clutch slave, now got a good feel to the pedal, all gears engage without noise going up, but the change down from 3rd to 2nd snatches / is noisy unless almost at a stop, and just that change - all others are fine. Have bleed clutch 3 times now and getting nowhere. Ideas please ?
vitesse is offline   Reply With Quote
Old 16th April 2020, 12:14   #2
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
Roverless + 1.7D Sportage

Join Date: Aug 2014
Location: East Norfolk
Posts: 7,022
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
Default

Sounds like a worn synchromesh on 2nd gear, if the other gears change OK without too much force. Can happen if the clutch has been bad for a while.
__________________
Oil in my veins!
roverbarmy is offline   Reply With Quote
Old 16th April 2020, 12:21   #3
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,516
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Quote:
Originally Posted by roverbarmy View Post
Sounds like a worn synchromesh on 2nd gear, if the other gears change OK without too much force. Can happen if the clutch has been bad for a while.
I was fearing something like that which would almost be terminal for the car as it requires new belts and welding.

Thanks for the reply.
vitesse is offline   Reply With Quote
Old 16th April 2020, 15:55   #4
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
Roverless + 1.7D Sportage

Join Date: Aug 2014
Location: East Norfolk
Posts: 7,022
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
Default

Quote:
Originally Posted by vitesse View Post
I was fearing something like that which would almost be terminal for the car as it requires new belts and welding.

Thanks for the reply.
You will have to teach her how to double de-clutch! Third to neutral, clutch out and rev, clutch in and it should go in to second sweetly if the revs were correct. It's how we drove before synchromesh gearboxes! The old gearboxes were called "crash" gearboxes for good reason!
__________________
Oil in my veins!
roverbarmy is offline   Reply With Quote
Old 16th April 2020, 16:11   #5
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,516
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Not easy teaching young ones new tricks, especially when you need their help to get your iPhone working

But was thinking of the sync ring, why doesn't it "sing" on the way up, just down?

Regards
vitesse is offline   Reply With Quote
Old 16th April 2020, 16:52   #6
stocktake
Vis Whiz
 
stocktake's Avatar
 
Rover 75 2.5 auto Saloon

Join Date: Jun 2007
Location: LEEDS
Posts: 20,582
Thanks: 2,057
Thanked 3,056 Times in 1,621 Posts
Default

Syncromesh has a lot easier job on the way up the box. when going up through the box you can easily change gear going up the box with no clutch once you get a feel for the box.

Going down through the box is a different matter. the speed ratios are very different, again you can change down without a clutch but you need to blip the throttle to increase engine revs and then feel the box.

I would have to concur a worn sync is probable, where is the biting point Mike?
__________________
Dave...



Lost a few stones and a Gall Bladder and part of a bile duct and all of my dignity in the suppository incident
stocktake is offline   Reply With Quote
Old 16th April 2020, 17:10   #7
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,516
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Thanks for the reply Dave. The biting point is about 3/4 of the way up and doesn't slip or anything, everything is OK except for the change down from 3rd to 2nd.
We'll see what she wants to do but she won't want it as it is meaning there will be more work down the line for you know who or she'll sell it for spares.

Keep well

Mike
vitesse is offline   Reply With Quote
Old 16th April 2020, 18:52   #8
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
Roverless + 1.7D Sportage

Join Date: Aug 2014
Location: East Norfolk
Posts: 7,022
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
Default

When I had to teach folks to drive a "crash" gearbox, the key saying was revs up to change down and revs down to change up. It is a matter of synchronising the gears into mesh. If you think of the engine speed just before you change up the gearbox, that is the engine revs you need to align the meshing gears (as you rev in neutral with the clutch out) to change back down the box. Sounds complicated but it becomes second nature once you get into the habit.
https://www.youtube.com/watch?v=KlS6DF3NjJE
__________________
Oil in my veins!
roverbarmy is offline   Reply With Quote
Old 16th April 2020, 19:01   #9
vitesse
I really should get out more.......
 
Rover 75 Saloon

Join Date: Jul 2011
Location: Gävle
Posts: 2,516
Thanks: 395
Thanked 823 Times in 652 Posts
Default

Thanks for the video, now all I've got to do is persuade my daughter to adopt the technique - I'll stick with my automatic
vitesse is offline   Reply With Quote
Old 16th April 2020, 19:28   #10
Mike Noc
This is my second home
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 11,531
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
Default

Learnt to double declutch early on, but struggled to get used to driving coaches with twin speed rear axles 'cos I never did it that often.
Mike Noc is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 01:55.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd