 | Home > Technical > Very hot transmission tunnel, never had it before. |
 
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| Grenadier Member Since: 23 Jul 2014 Location: The foot of Mont Blanc... Posts: 5804   
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Gentlemen,
Just noticed a new problem, after two years and 20km of ownership. The transmission tunnel during two recent, 100km motorway drives (at an average of no more than 100km/h) has becoming roasting. So hot I cannot drive with the window closed. Never, ever suffered from this before. For those who haven’t followed the recent travails of my DCPU, it recently had a catastrophic output shaft failure. It was repaired by OE parts and I also had a new clutch installed at the same time. Further, I have had a recent coolant leak, yet to be found nd repaired, requiring weekly top ups of coolant until I fully drain and test the system. Also the drive shaft seems to have started squeaking. So any thoughts? Have they left an exhaust shield off? Does the transmission need an oil change? Does the DS need some grease? Are the exhaust gases hotter than they should be? Driving to the Defender Party in Las Comes tomorrow, would rather not do it in a sauna if there is nothing I can remedy before leaving at lunch. Thanks in advance  Monsieur Le Grenadier
I've not been everywhere, but it's on my list..... 2011 Puma 110DC - Corris Grey |
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27th Sep 2018 7:01pm |
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| mick Member Since: 08 Feb 2010 Location: Yorkshire Posts: 2109  
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Wouldn’t like to hazard a guess but mine gets very hot on long motorway stints ☹️
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27th Sep 2018 8:13pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410 
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It does sound like there is some sort of heat shield missing post clutch change. Without it the tunnel does get very hot.
Your drive shaft wouldn’t create that much heat but greasing it is a good idea anyway. Coolant issue is likely to be unrelated but you really need to get a handle on that ASAP.. you know that though. The only interim solution I can suggest to get you to the meet without cooking is to drape one of those silver foil windscreen reflectors over your transmission tunnel cut to shape if you want to. Probably keep the temp down on your long drive... |
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27th Sep 2018 8:24pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3639 
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is the handbrake dragging since the gearbox was removed? DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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27th Sep 2018 8:32pm |
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| Roy5695 Member Since: 15 Feb 2014 Location: Cornwall Posts: 1123 
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My2011 plate DCPU also gets tremendously hot. Handbrake, tunnel. Seat rails. All hot to the touch. 2011 Defender DCPU 2.2 - https://www.defender2.net/forum/topic30623.html
Instagram - @r22oyp Roy |
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27th Sep 2018 9:33pm |
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| justinp Member Since: 24 Jun 2016 Location: Cambridge Posts: 167
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I’m fairly certain my 2012 2.2 is cool to touch. Now gone - 2012 2.2 110 DC XS
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27th Sep 2018 9:38pm |
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| Grenadier Member Since: 23 Jul 2014 Location: The foot of Mont Blanc... Posts: 5804
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Thanks for thoughts. Will take a look this morning. As mentioned, what's noticeable is that on all previous journeys, before the work was done, never got hot. Ever. That's now three journeys in a row and it's roasting.
Will keep y'all posted. Monsieur Le Grenadier I've not been everywhere, but it's on my list..... 2011 Puma 110DC - Corris Grey |
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28th Sep 2018 6:00am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17320 
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My DC (no a/c) gets very hot around that area in hot weather, especially if you have either of the front cab windows open. This may seem paradoxical, but I believe that having the windows open, even a crack, causes the airflow past the body to draw air out of the cab and suck hot air up from under the vehicle into the footwells through the panel gaps and especially past the handbrake.
As far as I know the only heat shields fitted to any TDCi Defenders are those in the vicinitiy of the cat (on the 2.4) and DPF (on the 2.2), there are none anywhere else that I know of on the exhaust. You will also find that the gearboxes do get hot in normal use since there are so many moving parts generating heat from friction. |
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28th Sep 2018 8:08am |
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| shropshiredefender Member Since: 05 Jun 2017 Location: Shropshire Posts: 834 
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Several things have happened since your output shaft replacement which could be related to having had gearbox (for clutch replacement) and transfer box removed and replaced.
01.The coolant leak - possibly as a result of incorrect hose replacement or damage done to a hose or fitting (e.g. heater control valve) during removal/replacement of the transmission). 02. Hot feet - the exhaust system has to be removed (at least partially) to drop the transmission, maybe it's leaking hot gasses or too close to the floor (unlikely but possible). Maybe the gearbox and or transfer box is running hot because of low lubricant. If I were you I'd have it checked by someone that you trust and take it from there. Be lucky |
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28th Sep 2018 1:19pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17320
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^^ It is worth bearing in mind that the fuel cooler is extremely close to the gearbox and it is possible that it has been damaged, which could give rise to coolant loss.
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28th Sep 2018 1:32pm |
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| rillas Member Since: 27 May 2012 Location: warilla nsw 2528 Posts: 16  
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had same problem in my 130 2014 on investigation it was the exhaust so wrapped with heat tape success
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13th Oct 2018 10:41am |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 538 
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I don't remember seeing any heat shield near the GB or TB on mine, would you have the part number? “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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18th Oct 2018 7:21am |
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| Grenadier Member Since: 23 Jul 2014 Location: The foot of Mont Blanc... Posts: 5804
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I have come to the conclusion that it's the handbrake shoe/drum. I loosened it a bit before my roadtrip to Spain and the heat stopped. Then one day I parked up, slight slack on the handbrake and the Def did the rock 'n' roll which self-tightened the HB. When I drove it the next day, it was hot again. Now I release the brake and if on a long journey give it a real waggle and make the cable feel as loose as possible, and since then, no heat. I'll adjust the shoe a little more, and may well add a heat shield at some point, but this does seem to have made an immediate difference. Thank you LR90XS2011 for the suggstion.
So, before a long drive, disengage the hand brake, let the vehicle settle ebfore driving off, and shake/waggle the handbrake lever until all tension is gone. When re-applying, do so gently and try and avoid the rock 'n' roll which seems to tighten the slack too much. If stopping on the long journey, perhaps avoid the hand brake and just leave it in a high gear? Monsieur Le Grenadier
I've not been everywhere, but it's on my list..... 2011 Puma 110DC - Corris Grey |
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18th Oct 2018 9:53am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17320
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Do you perhaps mean low gear?
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18th Oct 2018 10:16am |
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