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Lurch and lumpy gear change on 3.2 xj40

Morgan1
Posts: 151
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Wed May 15, 2019 11:59 am

Thanks for the link, will definitely study it before changing it. All ready changed the jurid rubber and still the lurch. Even if the rear end renovation doesn't solve the issue I'm glad I did it. Just ordered the drive shaft centre bearing so will change it before the back end goes on. Looking forward to the fun and games trying to put it back up :shock:
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

katar83
Posts: 2714
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Lurch and lumpy gear change on 3.2 xj40

Postby katar83 » Wed May 15, 2019 1:02 pm

Found an interesting video

https://www.youtube.com/watch?v=_5h_fPt0ZsI&t=53s

I have something like this on mine, although probably not as bad. I think I'll need to take that coupling off on mine :roll: How was yours when you replaced it?
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.

Morgan1
Posts: 151
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Wed May 15, 2019 2:04 pm

The old jurid looked worn and was more plyable than the new one. When you do it mark everything with tipex to make sure it all goes back aligned. I haven't driven my car for about 6 months but I'll be interested to see if it has gone, fingers crossed.
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

naki_k
Super Moderator
Posts: 28514
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Fri May 17, 2019 11:33 pm

Great work on the diff overhaul.
It’s certainly more satisfying to put back shiny black parts, rather than crusty brown parts.
Which coating option did you use? Powder coating?
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

Morgan1
Posts: 151
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Fri May 17, 2019 11:51 pm

Cheers Naki. Went for a home / hobby standard of renovation and sanded surfaces with flap wheel on air tool. Prep using POR15 etch and then brush on using POR15 satin paint. Unfortunately the UV light affects POR15 so they recommend top coating. I top coated with hammerite smooth paint. It is a nice, tough finish that was the best I could do at home and on a budget. I don't particularly like hammerite but it was available and cheap. Can't speak highly enough of POR15. Great stuff, self smoothing and covers great. Highly recommended.
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

naki_k
Super Moderator
Posts: 28514
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Wed May 22, 2019 11:01 pm

It looks like a proper job to me. It’s always interesting to see how each person tackles these jobs. I am convinced they all need the same work now. So hopefully people seeing your work/ pics will be inspired to take do there’s too.
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
93 3.2s - 4.0 Manual conv
93 4.0 Sovereign
93 6.0 XJ81 DD6 x2
93 6.0 XJ81 XJ12
94 4.0 XJR
94 4.0 Daimler
96 4.0 X306 XJR
96 4.0 X300 D6
97 4.0 X300 Sport Manual
2000 LR Discovery ES TD5 A
Breaking 40/ 300

Morgan1
Posts: 151
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Thu May 23, 2019 8:38 pm

Thanks Naki. Just an update regarding the drive shaft bearing. I removed the old one and replaced it with new as well as the UJ's. The difference in the rubber around the bearing is huge. Id say on the new bearing the movement of the shaft is restricted to a few millimetres. On the old one it was more like a few inches! I hope it resolves the lurch issue. I think the shaft may have been 'kinking' when drive or reverse was engaged. Hope so anyway. Putting it all back on the car this weekend.
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

katar83
Posts: 2714
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Lurch and lumpy gear change on 3.2 xj40

Postby katar83 » Fri Jun 14, 2019 10:52 pm

Give us an update! :)
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.

Morgan1
Posts: 151
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Sat Jun 15, 2019 10:38 am

Sorry for the lack of update :D been a busy couple of weeks.
Right then, so after new shocks, new shock bushes, subframe removal, strip and rebuild including new universal joints on drives shaft, half shafts, new jurid, new output shaft bearings and new subframe mounts, new discs and pads, new drive shaft centre bearing, wheel bearing checked and fine. New diff oil etc........the lurch is still there :oops: it is a little better and I mean a little but at least from the gearbox back is A1.

The cars MOT ran out during the rebuild etc so had to take her this week. Result....pass no advisories, which is great. MOT guy is a great bloke and he told me he actually looks forward to seeing my car and wondered where I was as it was late and the MOT had expired.

I'm going to run it for a few weeks as is and then go back to the gearbox and it's fluid etc. I have tried the fluid to the max level when hot and I've also removed oil when cold and set the level to the cold level and still the lurch! I've also tried the gearbox cable adjustment in the past but will go back to this. I have also replaced the gear box mount ( which was crumbled). Anyway, 10 out of 10 for effort, 2 out of 10 for results :lol:
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

katar83
Posts: 2714
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Lurch and lumpy gear change on 3.2 xj40

Postby katar83 » Sat Jun 15, 2019 2:06 pm

That's not good then, was really hoping its that centre bearing. I suspect it could be something to do with the gearbox cable as when I got my car that lurch wasn't there at all but the gearbox cable was pretty badly set up and I just tightened it up when my reverse gear disappeared for couple of days(that fixed it) but I didn't really follow up proper Jag instructions to do it properly at the time.
Both, gearbox and throttle cable on my car are quite badly stretched and at the far end of their adjustment range and I suppose this could cause some issues with how gearbox operates :roll:
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.