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Gearbox in Park

katar83
Posts: 2744
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Gearbox in Park

Postby katar83 » Sun Jan 03, 2016 11:08 pm

You might be onto something here, gearbox will eventually stay in park if I keep the brake pressed and wait few seconds or at least it did today few times(although not tried on a big slope). Will have further look tomorrow.
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.

naki_k
Super Moderator
Posts: 28628
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Gearbox in Park

Postby naki_k » Sun Jan 03, 2016 11:35 pm

Good info.
Let's hope it is just. Simple external adjustment.
I know some members have reported a loss of drive on these boxes, that turned out to be a broken/ loose shift linkage. Could be a similar situation for the park brake linkage then?
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

Starbuck
Snr Member
Posts: 681
Joined: Thu Mar 19, 2015 4:48 am
Location: Melbourne, Australia

Re: Gearbox in Park

Postby Starbuck » Tue Jan 05, 2016 12:58 am

Hi Katar and Naki,

It's certainly possible. Once the pawl fully engages there is a spring-loaded lock (which looks to be 5 on the JDHT drawing) that solidly locks the pawl in place - this stops pressure on the gear wheel 'pushing' the pawl out again against spring pressure. If the linkage was very badly adjusted it is possible this spring-loaded lock would be unable to lock the pawl. I can't swear to it of course, but if that was the case though I would have thought on the ZF that the selector switch assembly would be out of adjustment too and this would show up in other ways? I think I have read on this forum that when the ZF switch is out of synch it causes all sorts of problems?

Best,

Starbuck
'94 XJ12 (and other toys)

katar83
Posts: 2744
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Gearbox in Park

Postby katar83 » Sun Dec 17, 2017 11:22 pm

Forgot to update this. In case anyone have the same problem in my case it was just the gearbox cable that needed adjustment(under ski slope). Tightened it up by maybe two turns and its still fine.
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.

naki_k
Super Moderator
Posts: 28628
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Gearbox in Park

Postby naki_k » Wed Dec 20, 2017 2:28 am

katar83 wrote:Forgot to update this. In case anyone have the same problem in my case it was just the gearbox cable that needed adjustment(under ski slope). Tightened it up by maybe two turns and its still fine.


An easy fix for a change then. But how long did it take the figure out the issue?
It’s maybe had a replacement gearbox before, and whoever installed it didn’t do any adjustment on the cable. It’s less likely the cable could have gone out of adjustment by itself?
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

Starbuck
Snr Member
Posts: 681
Joined: Thu Mar 19, 2015 4:48 am
Location: Melbourne, Australia

Re: Gearbox in Park

Postby Starbuck » Wed Dec 20, 2017 4:15 am

Hi Katar and Naki,

Even though the selector cable is a push-pull type they still stretch over time. As a result of being push-pull, when stretched they won't allow the pawl lock to engage and so the pawl can be pushed out of engagement by the locking wheel.

A good result because, as mentioned earlier, replacing the locking wheel or pawl are not straightforward tasks.

Best,

Starbuck
'94 XJ12 (and other toys)

katar83
Posts: 2744
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Gearbox in Park

Postby katar83 » Thu Dec 21, 2017 12:30 pm

naki_k wrote:An easy fix for a change then. But how long did it take the figure out the issue?


Half a year I suppose plus another half before I got a correct spanner to undo the damn nut that was holding it up :lol:

One scary moment too, pawl slipped once when I was leaving the car, not easy thing to stop even a slowly rolling car :lol:
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.

naki_k
Super Moderator
Posts: 28628
Joined: Sun Feb 21, 2010 9:25 pm
Location: Kirton, nr Boston, Lincolnshire

Re: Gearbox in Park

Postby naki_k » Fri Dec 22, 2017 12:01 am

Always a learning curve!
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