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Lurch and lumpy gear change on 3.2 xj40

naki_k
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Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Mon Aug 20, 2018 6:50 pm

Morgan1 wrote:Right, I had a look at the gearbox oil level today. I took it for about ten miles to warm it up. I then stopped on the flat, put it in P, R, N, D and back. Checked the oil and it was about an inch below minimum on the 'hot' marker :oops: . I then re dipped and the oil was all over the dipper so could get another reading. I'm going to buy the ATF tomorrow as it's a 18 mile round trip to the motor factors for me. How much oil is needed from min to max on the stick?

Once the right level is achieved I will re adjust the kickdown cable and see where we are?


I find checking at Cold may be more accurate .
3.5-4.5L would be about normal per change.
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Morgan1
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Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Mon Aug 20, 2018 8:09 pm

Hi Naki, is it the same procedure for the cold check, I.e. have the car running and put it through R, N, D and back to P and then dip?
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

naki_k
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Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Mon Aug 20, 2018 10:32 pm

Yes, but run it through the procedure 3-4 times, not just once. I check the dipstick in Neutral, rather than Park. Am not sure if it makes a difference. That’s just how I have always done it. Worth a try I would think.
Best case scenario is an underfill, that could be topped up, that might help.
Worst case.... I think you know.
88 3.6 XJ6 PDH/CEM
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91 4.0 XJ6 Manual
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Morgan1
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Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Mon Aug 20, 2018 10:40 pm

Thanks Naki, will let you know the outcome tomorrow, fingers crossed.....
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

naki_k
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Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Tue Sep 04, 2018 5:23 pm

Morgan1 wrote:Thanks Naki, will let you know the outcome tomorrow, fingers crossed.....


Any news?

I was going to ask. Before you renewed the transmission fluid, did you note the colour of the fluid that came out? The colour is quite significant. Namely if it’s dark brown it almost certainly means burning from the clutches.
I have a known faulty box here, and I just happened to drain the oil off now, and it’s the darkest I have ever seen. Completely brown, not at all a hint of pink, like healthy oil should be.

Obviously you have renewed the fluid now, so looking now won’t rebeal anything, but it’s only if you happened to look beforehand?
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
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93 6.0 XJ81 XJ12
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94 4.0 Daimler
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2000 LR Discovery ES TD5 A
Breaking 40/ 300

Morgan1
Posts: 145
Joined: Thu Dec 08, 2016 10:45 pm
Location: Aberdare, south Wales

Re: Lurch and lumpy gear change on 3.2 xj40

Postby Morgan1 » Tue Sep 04, 2018 8:16 pm

Hi Naki sorry for delay, we changed broadband providers and had a few issues with the internet. I have parked the car on my drive and made sure it is perfectly flat using ramps. I then drained off (via vacuum pump) about 1 litre of oil and checked the oil when cold. The system I used was start car, put it through all gears and back to park and then dip with engine running. The oil is now to the max at cold on the dip stick. The lurch is still there :( . I haven't had chance to run the car to see if the changes are better but will do this when I get chance this week. When I changed the oil it was very dark and needed a change. I have done about 6000miles since and the oil is still nice a red.
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

naki_k
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Re: Lurch and lumpy gear change on 3.2 xj40

Postby naki_k » Wed Sep 05, 2018 12:33 am

Morgan1 wrote:When I changed the oil it was very dark and needed a change. I have done about 6000miles since and the oil is still nice a red.


Ok. Am just wondering if the damage was already done?

It may be time to seek expert advice from Transmission company. Though I suspect all they may say is it needs to be refurbished?
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: 145
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 Sep 05, 2018 7:25 am

I agree, I have googled a few to see if they are close to me. I have done a lot of research after your advice on the internet regarding the gearbox itself. There is reference to cleaning certain internal parts but this is beyond my skill and time level so specialist is the way forward I think.
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

Morgan1
Posts: 145
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 Sep 05, 2018 7:36 pm

Has anyone experience of Liqui Moly Automatic Transmission ATF Cleaner? I am thinking of doing an oil change again to see if it changes things :?: the manual recommends dexron 2 but I have used dexron 3, would this make any difference? Also what is the 'Gold standard' of ATF to use?
1992 Jaguar xj6 3.2 litre.
2016 Audi A6 S line.
2016 Ford Fiesta zetec.

katar83
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Re: Lurch and lumpy gear change on 3.2 xj40

Postby katar83 » Wed Sep 05, 2018 9:05 pm

I'm with Larry on this. Anything loose at the back? A frame bushes ok? Any noises from the back when you change from D to R quickly? My Jag recently started to make some clonking noises at the rear and the gear changes were all over the place, harsh too. Couldn't find anything loose in there so eventually I've decided to push until something gives up :lol:
Few hard changes from R to D and back, coupled with a hard push on the throttle and eventually one of the uni joints revealed itself, mashed up and cracked metal on the hub side.
Changed it and gear changes are back to normal.
Mind you, previous investigation revealed 0 play in them, its only under load that they seem to cause problems, especially at low speeds it seems between 1 and 2 gear. Not really sure how to properly test it :roll:
Still have some play at the back so will be changing other side soon too and then will look at propshaft and gearbox mount, I bet nothing left of the original mount by now.
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1988, 3.6S XJS - Never ending restoration project.
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