 | Home > Puma (Tdci) > Long descents in low box at high altitude |
 
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and I am happy to be told that!
| T1G UP Member Since: 08 Dec 2009 Location: Bath Posts: 3101   
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TB box getting too hot?
If the engine is shut down...ie no fuel for a 2 mile period maybe the bore overheated a little? |
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13th Apr 2012 10:39pm |
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| mudrut Member Since: 01 Mar 2012 Location: Stourport-on-Severn Posts: 80  
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Interesting.....
On the transfer box idea, though, last time out in a convoy of TD5s and TDCis, the TD5s didn't suffer the same effect with their transfer boxes. regards Ian |
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13th Apr 2012 10:43pm |
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| BigRuss Member Since: 15 May 2010 Location: Norfolk Posts: 2785 
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As you said Ian, interesting,
Well as we all know e td5 is a very different beast form the tdci. Can the passengers be a little more descriptive? Diesel has a very distinctive smell, it isn't impossible for them to smell what is a concoction of unburnt diesel, oil from the engine, gearboxes or the bell housing and mix that with whatever the gearboxes are covered in (mud, waxoil). Tig As for the bore over heating, the engine block coolant is there to prevent this and it would still be picking the oil up from the sump and lubricating the bore to reduce even more heat. So I don't think that's the issue. Hth Russell 2011MY 110 XS USW Black |
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13th Apr 2012 10:57pm |
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| mudrut Member Since: 01 Mar 2012 Location: Stourport-on-Severn Posts: 80
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Russ
I know what you mean - but the smell just wasn't obvious. I wonder if it was some kind of interaction with the cat. (When we changed convoy positions I could smell it myself.) The engine temperature indicated nominal at all times. When I am there next week, I will put my nose in the exhaust pipe so I can confirm that it comes from inside the engine rather than an external surface. 
regards Ian |
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13th Apr 2012 11:14pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2283  
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It is water condensation especially on cold weather. The use of a muff or any device to restrict cold air into the radiator improves the situation. They are very common in trucks and buses working at high altitude. Puma 110" SW
............................................................. Earth first. Other planets later |
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14th Apr 2012 2:11am |
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| twopoint6khz Member Since: 18 Aug 2011 Location: North Lakes Posts: 652 
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I wouldn't think it'd be engine heat - in that kind of situation your engine will be swallowing a full charge of air every stroke, but putting (next to) no fuel in. That should pull the engine temperature down pretty quickly. In fact modern diesels don't really get warm when idling, cos they're too goddamn thermally efficient
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14th Apr 2012 11:18am |
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| SteveS Member Since: 05 Oct 2010 Location: Devon & Berkshire Posts: 388
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If as Ian said it appears to be only TDCi then if this were the cause then wouldn't you get it on all diesels? Perhaps the TD5s all had muffs on? |
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14th Apr 2012 2:27pm |
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| bpman Member Since: 21 May 2008 Location: Oslo Posts: 8069 
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How steep was the hill? Was there sheer drops? Could it be passenger related?
Seriously - its got to be fuel or egr related - there will be no stress on the engine for the descent and therefore the egr will be fully open - maybe the egr is getting too hot? |
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15th Apr 2012 7:38am |
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| mudrut Member Since: 01 Mar 2012 Location: Stourport-on-Severn Posts: 80
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Thanks for all the replies. I am going to see what else I can find out in the next cuppla weeks. I am wondering if a small amount of unburnt fuel is being passed through to the exhaust - perhaps evaporating in there. The smell is 'chemical', but not obviously diesel. What would unburnt diesel evaporating on the cat smell like? Just an idea......
I don't think a rad-muff would make a difference, but I have one somewhere. If I can find it, I will try it. Thing is, at that very low speed and moderate outside temperature, I can't imagine there is a substantial cooling effect anyway. Also, the engine temperature remains nominal. I recall a time when there were two TDCis, a 200TDi, an L200 and a Hilux in the convoy and only the TDCis exhibited this effect. I have also driven the area in both my TD5s - and again, no similar effect. regards Ian |
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15th Apr 2012 9:37am |
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| bpman Member Since: 21 May 2008 Location: Oslo Posts: 8069
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another thought ... could it be waxoyl/dinitrol burning off the exhaust or nearby components ?
Have a great trip Ian ... look forward to seeing the photos |
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15th Apr 2012 10:50am |
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