2002 XJ8 Transmission problem - A Drum?
#1
#6
How does someone address the issue after the point of recognition before the hard damage of shattering or tooth loss of the A - drum ( if there is a lesser intrusive try if the A - drum is not damaged before complete teardown if it is ). I understand the root cause is scoring and bypassing on the valve body with the main pressure regulator and the solution is to ream the cylinder up a size . But in order to get to the valve body in the lower pan requires dropping the transmission ( ? ) . I don't understand the reason why you would have to drop it . This is for a local X308 owner that may want to be ahead of the game and do the modification before it becomes an issue .
https://www.jaguarforums.com/forum/x...val-faq-48233/
https://www.jaguarforums.com/forum/x...val-faq-48233/
Last edited by Lady Penelope; 07-25-2017 at 10:35 PM.
#7
To get the valve into the body, you unbolt the valve body from under the tranny. You don't need to drop the tranny, justbthe sump and valve body. The tranny has to come out if the A drum has fractured... And you don't up the cylinder... You up the valve (basically a piston) which is in the cylinder bore
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Lady Penelope (07-26-2017)
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#8
Last edited by Lady Penelope; 07-26-2017 at 06:23 PM.
#9
Here is a thread I made showing how to install Transgo pressure valve.
https://www.jaguarforums.com/forum/x...hlight=Transgo
https://www.jaguarforums.com/forum/x...hlight=Transgo
The following users liked this post:
Lady Penelope (07-26-2017)
#10
To get the valve into the body, you unbolt the valve body from under the tranny. You don't need to drop the tranny, justbthe sump and valve body. The tranny has to come out if the A drum has fractured... And you don't up the cylinder... You up the valve (basically a piston) which is in the cylinder bore
The following users liked this post:
Lady Penelope (07-26-2017)
#11
#12
Thanks for the information guys . With respect to the original thread starter wrd0225 at the point of recognition of the issue is there a chance that the A - drum is not damaged and can be left alone , or would you recommend replacing it ? I will look for metal in the filter and pan . I will pass the information you provided along to the 3 area XJ8 owners for the 4th one had the transmission replaced .
TransGo ZF 5HP-24: 5HP-24-PR
TransGo ZF 5HP-24: 5HP-24-PR
Last edited by Lady Penelope; 07-26-2017 at 08:52 PM.
#14
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Don B (07-26-2017),
Lady Penelope (07-26-2017)
#15
wrd0225,
I have merged your two threads into one since they were both related to the same malfunction, and it reduces confusion for other members to see all the related posts in the same thread.
FYI I am having a similar problem on our 2003 XJ8. I have already installed the Transgo pressure control valve, which improved things somewhat, but I'm still getting the occasional slip-then-slam behavior, mostly when slowing to a near stop then applying throttle. My next step will be to do the A drum upgrade but since my other Jag needs a bottom-end rebuild (connecting rod bearing), for now I'm nursing the '03 by relearning my bad lead-foot habits.
Cheers,
Don
I have merged your two threads into one since they were both related to the same malfunction, and it reduces confusion for other members to see all the related posts in the same thread.
FYI I am having a similar problem on our 2003 XJ8. I have already installed the Transgo pressure control valve, which improved things somewhat, but I'm still getting the occasional slip-then-slam behavior, mostly when slowing to a near stop then applying throttle. My next step will be to do the A drum upgrade but since my other Jag needs a bottom-end rebuild (connecting rod bearing), for now I'm nursing the '03 by relearning my bad lead-foot habits.
Cheers,
Don
#16
Don B , I faintly recall ( for this is not my transmission model ) seeing a kit that included a reamer to upsize the bore and polish if the metal is scored or scratched allowing a bypass above the regulated pressure . This would require a larger o - ring other then what is currently installed . Could be a damaged o - ring during previous repair installation being rolled or cut or wrong size . This might be your case without touching the A - drum .
Last edited by Lady Penelope; 07-26-2017 at 09:36 PM.
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Don B (07-27-2017)
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