Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Andy89 on 30 March 2012, 21:31:33

Title: Jerky gear changes on manual
Post by: Andy89 on 30 March 2012, 21:31:33
Hi

Since I changed from automatic to manual, it has allways been jerky on the gearchanges, I have to work hard get a good gearchange.
Can it be the gearbox, or is it other parts?
Title: Re: Jerky gear changes on manual
Post by: Andy B on 30 March 2012, 22:12:21
Hi

Since I changed from automatic to manual, it has allways been jerky on the gearchanges, I have to work hard get a good gearchange.
Can it be the gearbox, or is it other parts?

How long have been driving auto's? When I returned to a 3 pedal car after about 15 years I found it took a few weeks before the fluidity of gear changes returned.  :y
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 30 March 2012, 22:31:04
It has nothing to do with that, it's over half a year since the change.
I have another manual car as well, and I have borrowed cars  ;)
Title: Re: Jerky gear changes on manual
Post by: Andy B on 30 March 2012, 22:32:25
It has nothing to do with that, it's over half a year since the change.
I have another manual car as well, and I have borrowed cars  ;)

Oh!  :y :y :y  ;D ;D
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 30 March 2012, 22:41:16
In other cars the gearchanges are easy
But in the omega it takes alot more work

I guess there some play in the driveshaft, gearbox, diff etc, but I don't know how much play is normal or how to know if somethings broken/worn
Title: Re: Jerky gear changes on manual
Post by: bigtow on 31 March 2012, 00:28:05
mine has been converted to manual and the gear shift is not as smooth ( through the gate ) as my mfl 3.0 factory manual i was wondering the same thing maybe a bush or the linkage ?
Title: Re: Jerky gear changes on manual
Post by: Omegatoy on 31 March 2012, 20:01:00
Um just a point to  note, bad DMF can cause this, as it bangs to full movement rather than smoothly taking up the drive :-X
Title: Re: Jerky gear changes on manual
Post by: HockeyDave55 on 31 March 2012, 21:49:53
I was thinking the flywheel and have been thinking of a solid flywheel conversion....
Title: Re: Jerky gear changes on manual
Post by: doz on 31 March 2012, 22:00:55
Check the rubber do'nuts on the prop shaft
Title: Re: Jerky gear changes on manual
Post by: Kevin Wood on 31 March 2012, 22:17:37
Yep, backlash anywhere in the transmission, engine and gearbox mounts, DMF, as said. A juddery clutch due to wear or contamination of the friction material perhaps. Difficult to diagnose further without experiencing it, though.
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 31 March 2012, 23:06:45
DMF= Dual mass flywheel?
I don't know the condition of it since I Bought it used, but i bought new clutch.
I'll check the donuts

If the bearing in the middle of the propshaft is bad, will that just noise or will it make symptoms like this?
Title: Re: Jerky gear changes on manual
Post by: Kevin Wood on 31 March 2012, 23:11:21

If the bearing in the middle of the propshaft is bad, will that just noise or will it make symptoms like this?

It might well do, if it's no longer supporting the propshaft.
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 01 April 2012, 21:58:23
When i drive off and release the gas pedal it feels like something falls forwards and when i press the gas pedal again it feels like something falls backwards.
I'm guessing this it what makes it hard to change gear, what it can be?
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 02 April 2012, 19:29:58
Maybe a poor explanation, but it feels like something is sort of loose
Title: Re: Jerky gear changes on manual
Post by: Omegatoy on 02 April 2012, 19:43:50
classic dmf pointers!! the looseness is the two halves sliding round!
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 02 April 2012, 20:34:37
So it's very worn then?
How will the changes be if I insert a lightened smf?
Title: Re: Jerky gear changes on manual
Post by: bigtow on 02 April 2012, 22:13:37
i have a solid flywheel in mine get lots of transmission noise and still jerky changes you will probably be better off getting another DMF . think my problems are gear linkage related .
 
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 02 July 2013, 15:53:09
Bringing up this old post again

I have changed the DMF to a c20let SMF og i have changed a donut bush that was worn
But i'm still experiencing the roughness of the gearchanges, although the worst is when I let go of the accellerator and press it down again (I have to be extremely carefull for it not to jerk)
i'm also experiencing some alerting gearbox noises, when i'm idling (allthough i'm not sure if thats the clutch bearing or the gearbox itself, but it stops if i press the clutch)

Any ideas what can be the problem?
Title: Re: Jerky gear changes on manual
Post by: dbug on 02 July 2013, 16:21:20
Bringing up this old post again

I have changed the DMF to a c20let SMF og i have changed a donut bush that was worn
But i'm still experiencing the roughness of the gearchanges, although the worst is when I let go of the accellerator and press it down again (I have to be extremely carefull for it not to jerk)
i'm also experiencing some alerting gearbox noises, when i'm idling (allthough i'm not sure if thats the clutch bearing or the gearbox itself, but it stops if i press the clutch)

Any ideas what can be the problem?

Usually symptomatic of a worn clutch release bearing ;)
Title: Re: Jerky gear changes on manual
Post by: 05omegav6 on 02 July 2013, 16:22:45
If the noise stops clutch down then release bearing is the cause. Won't hurt to change it if you drop the box to change the dmf :y
Title: Re: Jerky gear changes on manual
Post by: Kevin Wood on 02 July 2013, 17:07:44
If the noise stops clutch down then release bearing is the cause. Won't hurt to change it if you drop the box to change the dmf :y

I'd say more like the the spigot bearing in the end of the crank, otherwise it'd be the other way round. ;)

The other question is, when the DMF was changed for a solid flywheel, did you change the driven plate to one with a sprung hub to absorb transmission shocks?
Title: Re: Jerky gear changes on manual
Post by: Andy89 on 02 July 2013, 17:59:38
New crankshaft bearing fitted
New reinforced C20LET clutch and pressure plate fitted
New slave cylinder with new clutch bearing fitted

Sound stops if i press the clutch, and get's very silent if I push the shifter forvards without pressing the clutch

Here's a video of the sound: http://s259.photobucket.com/user/Andygun89/media/MOV_0204_zpsb18ca4da.mp4.html
Title: Re: Jerky gear changes on manual
Post by: Kevin Wood on 02 July 2013, 22:26:12
Sound stops if i press the clutch, and get's very silent if I push the shifter forvards without pressing the clutch

Sounds like it's from the gearbox itself in that case. Not sure if it'll be related to the jerky changes, though.
Title: Re: Jerky gear changes on manual
Post by: 05omegav6 on 03 July 2013, 01:17:10
Sound stops if i press the clutch, and get's very silent if I push the shifter forvards without pressing the clutch

Sounds like it's from the gearbox itself in that case. Not sure if it'll be related to the jerky changes, though.
Oil level? :-\ be worth a looksee...