TD5 heat shield. necessary or not?

[bob10]

Just replaced my exhaust manifold with exchange unit, machined @ the webs relieved. Got me thinking, the heat in this area seems to cause a bit of strife, what with the oil cooler hose @ manifold problems. The questions I ask is;

1 Is the heat shield necessary in our climate ?

2 Would it cause bigger problems to remove it @ leave it removed. ?

3 Would it be a good idea to have vents placed in the bonnet, to vent the heat. ?

I would appreciate informed advice on this topic, as I really don't have a clue, apart from the fact I don't want to do that job again, Bob
:confused::)

[Recy Mech]

Disclaimer: I'm not Rover trained.

From working on all sorts of equipment & plant in the mining and oil/gas industries I have found that all suppliers are Northern Hemisphere based, ie North America, Germany, & UK. Their testing does not take into account extreme climatic conditions eg Australia, other than a baseline - 32 deg C. Now they are aware of the winter months in the Northern Hemisphere and like it or not that is where most of the equipment is sold. (Sorry to break up the myth but our mining equipment only makes up a very small percentage of the global sales.) The manufacturers do go to lengths to ensure that engines and the like are kept to a temperature constant and heat shielding and deflection is just one of the engineering concerns.

Now having said all that guff, what I and others have found that when the gear is here (Australia) it is on its max limits just about all the time expecially during the summer months. So creative engineering is required to make the plant run cooler, and that does require the removing of engine panels/shields et al.

Probably doesn't answer your question directly, but, If I am to nail my colours to the mast: I'd say have a go at removing the shielding as a bit of a comparison. You can always fit it back again.

[scott oz]

I recall reading somewhere that the heat shield protects the bonnet and paint from the heat. My TD5's doest have any bonnet insulation yet my 92 200TDI Disco did:angel:

Not sure if this is true or just my poor memory

[Recy Mech]

As some of the more erudite members of this forum will attest a lot of the shielding will be also to do with sound deadening. Notice how 'old school' landys et al didn't have all the modern conveniences of sound proofing, heat shielding. Nowadays you have to spend half a day removing all the pifle just to see the engine.

Anyway, I say get rid of it - heat shielding, and see how she/he perfoms. I reckon you'll probably notice a engine temp difference - down, but a sound/heat transference in the cab.

Life's a compromise.

[stevo]

yes Recy I know where you are coming from used to work in the mines and have cut slots into engine covers on new machines that used to over heat during summer but gees the company reps that looked after the machines during the commosioning stages would whinge.

But they were not allowed to do the mods and we just went ahead down time is not allowed in mining etc would usually solve the problem of over heating

[alanw]

Took the heat shield off my 2004 td5 defender a few years ago. Got sick of skinning my knuckles trying to get at the oil filter.

Only thing I have noticed since I took it off is that it is easier to get at the filter.........

alanw

[Blknight.aus]

It is absolutely imperitive that you retain the heat shield, The acoustic covers you can loose but the heat shield must stay.

Without the heatshield in place there is no-where to put traveler pies or sausage rolls to heat them up.

[scott oz]

OK,

So it’s an urban myth that the heat shield is need and its removal will not cause problems with the paint?

In which case another urban myth busted and I'll be loosing mine this weekend.:D

[gusthedog]

My D2 never came with one and I haven't found it to be an issue. And no the paint has not bubbled. I have installed an Arb battery tray though so custom made an aluminium heat sheild (with fire proof insulation behind) around my 2nd battery.

I asked my mechanic about the lack of heat shield (he has worked on rovers for 40 years) and he said he thinks they actually hold heat in and therefore make the turbo hotter. He said not to worry about putting one back in. I haven't and have had no issues in 5 years of ownership :)

[northiam]

But.
the shield is there to keep the turbo exhaust turbine hot to improve efficeincy and lower under hood temps. :o

The theory is simple: Heat is energy, and gas expands more the hotter it becomes. More heat kept in a turbo manifold or inside a turbine housing equates to more pressure (energy) that can be directed through a turbine wheel, improving turbine performance, and subsequently compressor performance, for an increase in overall boost pressure and a decrease in the time it takes to build that pressure.

Read more: Turbocharger Heat Shielding - Fact Or Fiction - Import Tuner Magazine (http://www.importtuner.com/tech/impp_1103_turbocharger_heat_shielding_fact_fiction/#ixzz1oDf5a1Z9)

[goingbush]

Ditch the Engine cover AND the turbo heat shield.

The Turbo does run more efficiently if it is insulated against heat loss, but the factory heat shield is USELESS.
You can use a Turbo Blanket or wrap the turbo in Exhaust Wrap for this purpose.

Turbo runs more efficient, engine bay is cooler, water temp 5-8 deg cooler, and cabin temp much cooler in summer. (interior not as warm in winter tho)

[scott oz]

Does the removal of the engine cover increase the noise level much?

I must say I was thinking last night about the heat shield and came to the same conclusion. It's hardly a turbo "blanket". Might phone the place northiam suggested and see what a specific blanket is worth.

[OffTrack]

The turbo blankets sound like an interesting idea. While looking for more information relating to their use on TD5's I came across this post by rick130, which is quoted in part below.

http://www.aulro.com/afvb/technical-chatter/124365-exhaust-wrap-110-2001-td5-post1467781.html



You can buy a specific turbo blanket for certain model turbine housings but it's for high performance applications only AFAIK.
I've been told it will lead to degradation of the housing and manifold long term, but it'd be interesting for someone to ask Garrett what their take on it would be.


I'd guess that the main purpose of the turbo heat shield is safety as it prevents direct contact with exhaust manifold and turbo body.

cheers
Paul

[gusthedog]

Does the removal of the engine cover increase the noise level much?.

I took mine off because the on the single-bolt-side I snapped the flimsy fastener. It is a little louder but not too bad. I like the diesel sound though.:)

On another note - a mechanic told me (in Darwin on my trip around oz) that the acoustic engine cover also acts as a fire blanket in case the engine goes up. This was more of a worry in my 110 as it had no bonnet insulation (which does the same job I think) than in the D2 which has the bonnet insulation present. I am not 100% on this though but expect some of the wise and humble LR masters on here would definitely know :TakeABow:...

[goingbush]

I should mention that I have gusthedog's old 110, I also have my exhaust pipe wrapped from the turbo back to just behind the transfer case, and have now fitted under bonnet insulation. the under bonett insulation did make a noticeable noise reduction
SOUND INSULATION UNDER BONNET 1.5M X 1M SELF ADHES | Rare Spares Online Shop (http://www.rarespares.net.au/rarespares/ProductPage.aspx?product=SB1)

[Recy Mech]

Turbo blankets per se are used for primarily a safety device. In case an oil/fuel line ruptures and sprays the stuff over the turbo - then 'whoof', up she goes in a ball of flames. Secondary concern is a heat shield for the 'hair dryer'.

[scott oz]

Well I'll take my heat shield off this weekend and will also remove the engine cover to see what difference there is in noise and heat.:)

[scott oz]

Well took off the engine cover and turbo heat shield two weeks ago.

Overall the engine does seem to run about 3 degrees cooler than previously. This is my observation over the two weeks driving the same roads and traffic each day.

On the weekend did a good two hundred K non -stop road trip and checked the top of the bonnet with hand. Was a little hotter over the turbo than the opposite side but only a couple of degrees. Certainly nothing to worry about.

My Temp gauge reads a constant 83 degrees now fairly much all the time since I removed the egr water cooler and plumbed it straight to the front lower section of the radiator.

[Gaudough]

My D2a is noticeably noisier in the cabin with the acoustic cover removed. Might not notice that in a Deefer.

Regards. Gordo

[akelly]

I tried acoustic (black plastic) cover on/off in my defender, it definitely made a difference to the noise through the bonnet. With the front vents open it was very noticeable. I put the cover back on.

Interesting about the heat shield... might give that a try.

Cheers,

Adam

[fellipe]

Just removed the heat shield on my D2 td5 (to change that secret coolant blanking plug). Guess I will keep it off. So much better to be able to view everything.

Any updates on this matter? Can I go ahead and keep it off?

Thanks

[Disco Muppet]

I have had an aux battery in the engine bay for nearly 4 years now.
At the end of last year I put a fairly large blister on the side of it.
Only happened after I took the heat shield off.
Its going back on on mine :)

Sent from my HTC One using AULRO mobile app

[bob10]

I have had an aux battery in the engine bay for nearly 4 years now.
At the end of last year I put a fairly large blister on the side of it.
Only happened after I took the heat shield off.
Its going back on on mine :)

Sent from my HTC One using AULRO mobile app

Why would you put a battery there? Recipe for disaster.

[4runnernomore]

Because that's where the aftermarket industry put it.

[Disco Muppet]

Exactly.
That's the standard spot, and 3 and 3/4 years I ran it without any issue, ran it all day in summer ambient temps on long highway runs and not a drama, until I removed the heat shield

Sent from my HTC One using AULRO mobile app

[Tins]

Why would you put a battery there? Recipe for disaster.

ARB put mine there (before I bought it ). But I agree, and mine now has one of Carl's trays where both batteries are together at the front.

[Eevo]

can argue whether is the heat shield is good or not.
does it cost anything to just have it there, just in case it is doing good?

[Disco Muppet]

It can make a few maintenance items a bit more difficult but really, what's a couple of minutes and 3 bolts?
As you say, costs nothing

Sent from my HTC One using AULRO mobile app

[AndrewMilne]

It is absolutely imperitive that you retain the heat shield, The acoustic covers you can loose but the heat shield must stay.

Without the heatshield in place there is no-where to put traveler pies or sausage rolls to heat them up.

Yes, Blknight - someone who has spent a fair bit of time in the bush!!

[AndrewMilne]

It can make a few maintenance items a bit more difficult but really, what's a couple of minutes and 3 bolts?
As you say, costs nothing

Sent from my HTC One using AULRO mobile app
There seems to be a great tendency on this forum to assume that LR engineers are dumb-arses. I don't buy it.
And in previous posts, I have stated why I think that putting a second battery anywhere near the turbo is a genuinely DUMB idea.
Computer cooling fans will NEVER cut it in a futile attempt to overcome the damaging effect of intense heat on a storage battery. Silly, silly, silly (to be very polite).
AndrewMilne

[AndrewMilne]

Just removed the heat shield on my D2 td5 (to change that secret coolant blanking plug). Guess I will keep it off. So much better to be able to view everything.

Any updates on this matter? Can I go ahead and keep it off?

Thanks
You can use a mirror if you really want to see in there.
I say leave it on.
Can you "view everything" when you are driving along and the turbo is generating immense heat?
No, No, No.
AndrewMilne