 | Home > Technical > Any GKN overdrive experts here? |
 
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467   
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Hi all, My 2004 Td5 90 X Tech has lately been intermittently showing symptoms of a slipping clutch when accelerating hard, it's been doing it for around a year or so now, it always seems worst on a cold wet day then gradually the slip diminishes and it drives normally.
It has an Alive stage 2 tune, uprated intercooler, EGR delete and straight through exhaust so it's quite nippy on full beans. It's been getting worse recently, although when driven carefully it's still quite possible to drive without it slipping at all. Whenever I've had a car in the past with a slipping clutch, it's usually failed completely after a relatively short time. I've had the 90 nearly 4 years now and added around 25'000 miles to it in that time, (now on 155K.) When I got it I was told the clutch had just been replaced. It came to me already fitted with a GKN overdrive which has always worked well, (apart from when the speed sensor failed, now replaced.) Now to the point of my post, I've read that the GKN unit contains clutches of some kind and I'm wondering if it could be the overdrive that's slipping rather than the normal clutch? The degree of slip doesn't really change whether it's in normal drive or OD. |
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3rd Dec 2018 8:44pm |
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| rustandoil Member Since: 08 Sep 2012 Location: Cotswolds Posts: 662  
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My GKN overdrive plays up in a similar way.... Pulling away from junctions is a bit disconcerting at times
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3rd Dec 2018 8:51pm |
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| Romadog Member Since: 07 Jul 2011 Location: Powys Posts: 1746 |
Why are you pulling away with it engaged?
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3rd Dec 2018 9:18pm |
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| barbel jim Member Since: 12 Dec 2012 Location: Northants Posts: 1411 
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I can't help with the overdrive, but would suggest you'll probably need a new clutch. I had a valeo replacement, that only lasted 18 months before the intermittent slip started. Replaced the clutch and sorted. They can become soft, especially on your useage and driving style.
My other TD5 has the start of same intermittent slip..... believe it's the original (12years old and 86k) which started after the remap and upgraded turbo  It dosnt do It everyday but has moments...... it will be being replaced at some point  |
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3rd Dec 2018 9:24pm |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467
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The slip is not on pulling away in the lower gears, I only engage it above 30 or more, the OD controller wouldn't allow it anyway, it's normally when doing maybe 40 or 50 in 4th or 5th, then giving it the beans to overtake for example, then it slips a similar amount whether the OD is engaged or not, ease off the loud pedal a bit and it stops slipping, just like you'd expect from a worn clutch. The puzzle is why it's not failed completely after all this time which prompted the question about the OD. |
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3rd Dec 2018 9:47pm |
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| Mo Murphy Member Since: 01 Jun 2008 Location: Letchworth Garden City, Herts Posts: 2077 
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The drive goes through the overdrive even when it is not engaged, slippage can occur even out of overdrive.
Mo The Land Rover 90 - Many are called, few are chosen. |
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3rd Dec 2018 9:57pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1568  
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Had the same with some other brands and them, only fit Luk now. Last edited by NickMc on 4th Dec 2018 12:46am. Edited 1 time in total |
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3rd Dec 2018 10:13pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5416 
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I had the same symptoms you are describing, but I had no overdrive fitted. Mine was my fuel pressure regulator leaking, then running down back of engine and contaminating the clutch. Load of brake cleaner, new FPR, and all good.
Andy. |
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3rd Dec 2018 10:36pm |
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| barbel jim Member Since: 12 Dec 2012 Location: Northants Posts: 1411
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Its when the torque starts to kick in. Opinion is the springs tire, and with the extra tourque it's just too much and breaks contact. The clutch I took out still looked new, and the dual mass flywheel was fine, so I just replaced the clutch and it's sorted. The FPR is a popular culprit for leaking on the clutch, but an trusted independent with years of experience has never seen a diesel contaminated clutch. Id also be hesitant with spraying clutch cleaner over the clutch, as it could also damage the release bearing and dry it out. |
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3rd Dec 2018 11:45pm |
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| Clive Member Since: 21 Mar 2014 Location: Littleborough Posts: 467
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Problem solved
Spot on barbel jim you were correct, the problem was indeed the pressure plate springs lacking in clamping pressure and unable to cope with the extra torque. I've just had a new Clutchfix heavy duty clutch kit fitted and it's completely solved the problem and there are no issues with the Overdrive which was a bit of a relief. The dilemma for me was that although it displayed typical symptoms of a worn clutch, it was intermittent in nature, seemingly depending on the temperature and how wet it was, also the fact that it was only very slowly getting worse, it's been my experience previously that once a clutch starts to slip it's toasted in quite a short time. Strangely, the old friction plate didn't appear to be particularly badly worn at all considering how it's been slipping for the last year or so. Anyway, I'm now a happy bunny, thanks to all for your helpful comments. |
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11th Dec 2018 10:23am |
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| barbel jim Member Since: 12 Dec 2012 Location: Northants Posts: 1411
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Excellent
Mines not slipped since my last post  Was only thinking about that an hour ago |
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11th Dec 2018 9:07pm |
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