 | Home > Puma (Tdci) > Transmission whine in 5th and 6th gear |
 
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| dmbueno Member Since: 12 Mar 2023 Location: London Posts: 2   
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Hi Pedro - I have the exact same noise in my 2002 Defender with ~200k km. Did you find out what was wrong with the transfer case? I'm wondering if it can be easily repaired or better to get a reconditioned transfer box Thanks! |
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12th Mar 2023 2:32pm |
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| pedrocandrade Member Since: 30 Sep 2022 Location: Rio de Janeiro Posts: 26  
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Hi dmbueno, the problem was in the gears, not bearings. Three where replaced in the transfer case and the noise disappeared. However, I just heard that the noise is returning, so far only when you lift off the gas pedal. So, beware that the issue might not be easy to permanently fix. I don't know why.
Here are pictures of the gears that were replaced.  Click image to enlarge Click image to enlarge Click image to enlarge Click image to enlarge |
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24th Apr 2023 7:57pm |
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| dmbueno Member Since: 12 Mar 2023 Location: London Posts: 2
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Thank you for the reply - very informative.
I am not totally surprised to learn that it was the gears, since the noise is similar to a gearbox with straight cut gears. So it makes some sense. The gears that were probably not working that smoothly for whatever reason. What is a little worrying is that he whine is coming back. That, along with your comment that when you replaced the transfer box with another one, you still had the noise. So it might be something structural in these transfer boxes - which is not great. But it is what it is, I guess. Next question is, would this happen to all of the LT230s? It doesn't seem to be the case. So, what are the reasons why it's only some of them, and not others? Hard to know I'm sure, but if someone has an idea I'm sure that a lot of us would appreciate knowing. In my case, I am planning on installing a reconditioned TB. Probably more economical and more reliable at getting rid of the problem than a rebuild. |
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24th Apr 2023 8:15pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421  
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I wonder if you would have been able to see any abnormality with prussian blue.
As regards transfer cases, there are 2 main ones (excluding the very early type). These are referred to as the LT230 and the LT230Q. Q stands for Quite, and they have the finer teeth (not on low gear). I also consider them as the less strong ones, but in part it could be caused by the fact that the Q were used on tdci engines Defenders. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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25th Apr 2023 9:22am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17441 
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Fixed that for you. You have to love auto-spellcheckers, eh? |
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25th Apr 2023 2:23pm |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1081  
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I thought the LT230Q was specific for and normally fitted to the the Disco 2? For comfort.
I have a Series which had a terrible whine and found that changing the large needle bearings in the intermediate shaft/gear completely cured it. I had thought it was gear (meshing etc) related, but no pure bearing issue. Obviously this is NOT an LT 230 box My current Td5 defender had a slight whine in the transfer case, quite easy to diagnose in my case because the whine was speed related and the same at 4th or 5th gear (at the same road speed). I could get my hand on a much older and higher mileage transfer case which I knew was quiet (had driven the car) and swapped it out one rainy day. The gears are now completely silent. Not sure what makes these go noisy, I have not opened my removed transfer case, but I expect like the Series transfer case it I will find worn bearings. Maybe there are good and bad batches of bearings or maybe it is a lubrication issue. |
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25th Apr 2023 3:07pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421
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Cheers for that 🍺 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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25th Apr 2023 5:04pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17441
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It was introduced with and for the Disco2 but is not exclusive to the Disco2. It wasn't for comfort, it was supposedly quieter. My 2.4 Puma LT230 has the same ratio and internals as the Disco2, although interestingly the casings are not the same, and the reasons for this are very hard to understand. |
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25th Apr 2023 5:20pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3421
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Here is a link to a very nice picture of the LT230 internals (less the center diff).
https://media.autoexpress.co.uk/image/priv...8/05_0.jpg The gears to the left are from a Q box The gears in the center are from earlier boxes. The gears on the right were an Ashcroft development, and only few were made. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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25th Apr 2023 6:09pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17441
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Interesting that the Q gears in the photo do not have the centre PTO dog, as I recall both my Disco2 gearboxes and all three of my Puma gearboxes do have these.
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25th Apr 2023 7:42pm |
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| ashtrans Site Sponsor Member Since: 08 Nov 2008 Location: Harpenden Posts: 258
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Most D2 boxes didn't have the PTO teeth, Dave
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25th Apr 2023 7:58pm |
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