S Type R 2002 V8 Gearbox (incipient) Failure

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webman
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S Type R 2002 V8 Gearbox (incipient) Failure

Postby webman » Mon Sep 14, 2009 6:43 am

This was posted by Omar, originally.

I have a 2002 V8 S Type R with very low mileage. 18 months ago the gearbox deveolped a leak and was subsequently replaced by the Jaguar main dealer. The replacement gearbox is now misbehaving when it changes gear from first to second and vice versa. The Jaguar main dealer has told me that I need to replace the gearbox again at mere £10,000.
What other car shares the same gearbox? I am looking to buy a complete car just to take its gearbox out rather than pay stupid money to put in a new gearbox from Jaguar.
Also, is there a repair that I can do to my existing gearbox? Please note I am in the United Arab Emirates and cannot nip down to the local Halfords.

Thanks
Omar


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webman
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This was posted by gnat, originally

Postby webman » Mon Sep 14, 2009 6:46 am

Hi omar
I am also new to the S-type having owned mine for only 8months and I have been tyring to find out what the faults are on these gearboxes. Apparently in the USA they do not replace the whole gearbox but only the solonoid pack which is the source of the problem, the solonoid pack costs about £500, a bit cheaper than a gearbox! I recently came across an S-type with a gearbox problem in a local garage and they replaced the solonoid pack which fixed the problem. Maybe a chat with a reputable auto electrical centre could be the way forward. Hope this helps.

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J44EAG
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Postby J44EAG » Mon Sep 14, 2009 6:48 am

The secret with the 5 speed Ford derived 5R55N, the 6 speed ZF and the Merc unit found in the S-type R is REGULAR oil changing. Jaguar say the oil is sealed in for the life of the gearbox. How long is the life of the gearbox? Who knows!

Jaguar suggest that under hard useage or in adverse conditions (?) that consideration should be given to an oil change.

Filters, filter/ sump- 6 speed,gaskets and oil are available from Jaguar dealers. Use the Jaguar oil only. ATF or Dextron type oils are wholly unsuitable.

Changing oil is NOT a diy job. Use of Jaguar electronic or Autologic interogation equipment is mandatory to ensure that the correct volume of oil is in the gearbox after an oil change. The correct oil temperature is vital to a successful service. Do not try to do this work yourself unless you have the correct knowledge, skill or equipment. Without those prerequisites, the job will end in tears. This is definately one for the professionals. Disbelieve me at your peril!

Solenoid packs found attached to the underside internal structure of the gearbox generally fail due to clogging by weardown particulates found in the gearbox oil after high mileage and hard use. Black oil indicates such a scenario and is indicative of worn components in the gearbox. In my experience, gearbox failure is not far away and consideration to a rebuild should be part of the plan to keep the car rolling along.

In many cases, the need for a replacement solenoid pack is due to those solenoids becomming choked with wear down particulates from gearbox components. If the solenoids or valve pack requires replacement, also drain down the oil from the oil cooler to remove as much old oil from the transmission as possible. Note however that the torque converter also has a quanity of oil remaining in it. A drain down plug is not provided, so unless the converter is removed from the flywheel, cut open, serviced,rewelded and rebalanced, any oil change is only a partial solution. However, oil changing, albeit only partial, can only preserve transmission life. Something is better than nothing. Black oil is black death to a gearbox and indicates that the end may be near!

My 5 speed transmission failed in Dec 08. The cost of rebuild including a rebuilt converter came to near £1600 inc vat and labour. 6 speed units are more expensive to rebuild as extra components are needed. Rebuilds are probably most economicaly sourced from a reputable indipendent transmission specialist. My unit was overhauled by Bristol Transmissions in Bristol(UK). Simon Park, the MD, is the man to speak to. I have to say BT made an excellent job of my rebuild, which has not missed a beat since intalled some 12k miles later.

From now on, I shall be changing the oil in my gearbox every 25k miles as a preventative measure. This mainenance will not be ignored under any circumstances.

When failure occurs, the temptation is to puchase a secondhand unit. I personnaly would not consider such a course of action for the reasons detailed above. A secondhand unit could fail the next day. Then the job would have to be done all over again. Buyer beware!

Mike Kennedy. JEC S-type Forum Co-ordinator.


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