Home > Technical (L322) > TD6 Gearbox, can you explain how it works? |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Hi all, I'm suffering at the moment, the ffrr is in hospital have its rumbling gearbox sorted,
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18th Sep 2014 6:33pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
just had a thought cross my mind, it didn't take long! , does anyone know of a larger transmission cooler? |
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18th Sep 2014 6:42pm |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7803 |
I believe sonnax do an upgraded oil pump if that's any help ? 2011 Range Rover Vogue SE 4.4 TDV8
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18th Sep 2014 7:01pm |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7803 |
Though it's not exactly what you asked for, here is a little further info regarding issues with our beloved auto box ;
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18th Sep 2014 7:17pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Hi, I'm not sure that an upgraded pump will help, as the box will be under warranty. Plus I think that increasing the cooling area / efficiency, would be of more benefit than pushing the oil around quicker. I must confess that I have no knowledge of the oil coolers location, and the type of fittings for the connections, as to the practicality of fitting a larger cooler. I can only surmise that its at the front and I'll have to remove the bumper, deep joy! |
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18th Sep 2014 7:25pm |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7803 |
At one time they used to be near the bottom part of the water radiator or at the front somewhere ? 2011 Range Rover Vogue SE 4.4 TDV8
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18th Sep 2014 7:27pm |
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vaz Member Since: 15 Jun 2014 Location: Colne, Lancashire Posts: 332 |
The transmission oil cooler is fastened to the engine block beneath the alternator. It has an oil to water heat exchanger and receives cooling overall from the main radiator.
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18th Sep 2014 7:34pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Thanks for those, I've seen the first one but not the second, however I was aware that the valve block has wear issues, and the rebuilder that I'm using assures me that he has a cure for that, and he will be increasing pressures in the box to stop clutch slippage. He also said that changing the oil every 12000 miles would go a long way to increasing the life of the box. not sure that it will be done with that regularity, but suffice it to say it will be be changed with greater frequency than Land Rover suggest!!! |
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18th Sep 2014 7:35pm |
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mjdronfield Member Since: 04 Nov 2011 Location: Derbyshire Posts: 7803 |
Yes, just seen I was wrong. Just looked this up in RAVE it's part number 7
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18th Sep 2014 7:40pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Hi Steve, thanks for the photo, now I know what I'm up against! Obviously a larger cooler in the same place is not an option, but seeing as you have experience of a stripped front end, do you think it would be possible to add an air to oil cooler as well? Only I do know a very reasonable place near heathrow that dose all types of oil coolers and adaptors for silly money, also aeroquipe brake lines! |
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18th Sep 2014 7:41pm |
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vaz Member Since: 15 Jun 2014 Location: Colne, Lancashire Posts: 332 |
I don't see why not. Would have to be mounted in front of the radiator or intercooler though to get maximum cooling. The pipes from the gearbox would need extending as well.
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18th Sep 2014 7:52pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
Right I've been looking into the extra tranny cooler, and they do kits in different sizes, and they do list a 1/2" kit for a BMW. I was thinking of this and the addition of an oil stat to only open when the temp exceeds 80 or 92 deg C. I have also noticed that they do remote oil filter mounts, and was wondering if it would be beneficial to add one into the line as well. Because from what I can understand the 2 biggest killers of transmission are heat (that causes slip) and then dirt ( result of slip), and from what I can gather the filter on the GM 5L40E is not very good at removing the friction dust from the oil, something to do with being sealed for life. Which is rather ironic that the feature that makes the gearbox service free, is also the main reason the gearbox fails prematurely! |
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18th Sep 2014 8:36pm |
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vaz Member Since: 15 Jun 2014 Location: Colne, Lancashire Posts: 332 |
Wouldn't do any harm with another inline filter provided it is not too restrictive with flow rate. Heat is a big killer with auto transmission oils. I think if the motor detects a gearbox fluid over temp situation, it places the engine ecu into limit mode, stops it changing into top gear, therefore allowing the extra engine rpm, cooling fan, etc to aid cooling of the radiator fluid, which in turn should help the transmission fluid cool down. I also use an additive with the gearbox fluid, Lubegard Platinum, have used it for some years in the various Range Rover automatics I have had. Towing heavy twin axle caravans over the Simplon pass into Switzerland and through Austria, I have never had an overheat problem with them.
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18th Sep 2014 10:03pm |
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miggit Member Since: 12 Jul 2014 Location: Milton Keynes Posts: 3657 |
I wasn't considering an engine remap, I'm plenty happy with the power / mpg that I get at the moment, when i said eco tune, I meant the gearbox! As it lowers the lock up speed of the box, which should reduce slip, which should reduce gearbox wear. However it might screw things up when it comes to a heavy load on the tow bar |
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18th Sep 2014 11:27pm |
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RRPhil Member Since: 22 Aug 2011 Location: Blackburn, Lancashire Posts: 969 |
Open torque converters are fabulous at isolating driveline torsional vibration. If you lock up the torque converter at low engine speeds you completely bypass this. For that reason the torque converter LUC has an intermediate state called its ‘continuous slip’ mode where it is controlled to slip at around 3% yet can still damp out the vibration. It achieves this by modulating the clutch engagement pressure according to the engine output torque. So the converter is open at low engine speeds, it then switches to continuous slip mode at low-to-medium engine speeds and then only locks solid at medium-to-high engine speeds. Land Rover know very well that higher efficiency/improved fuel economy would result from locking up the LUC sooner, but the NVH & driveline durability consequences override this.
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19th Sep 2014 1:18pm |
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