Exhaust heat shield - Chrysler 300C Forum: 300C & SRT8 Forums
 
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post #1 of 9 (permalink) Old 05-04-2013, 01:18 PM Thread Starter
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Exhaust heat shield

Been watching the Rattle underneath thread with interest as I've had a rattle too.

Anyway got the car up on ramps for the first time today since I bought it last summer. I also replaced the oil (with some of that GM oil as recommended on another thread) and the filter, put a plastic shield around the wires by the aircon pipes as the outer covering was being rubbed away and then started looking to see if I could find my rattle.

My brake shields are still reasonably shiny so I'm guessing they've been replaced by the previous owner but I did find two things:
- a couple of clips that secure the plastic shields underneath were broken so those have been sorted
- similar to what Simon from the custom300cshop said in a post on the "Rattle underneath" thread the silver lining on the exhaust heatshield was a mess and hanging down; it was rubbing on the prop - thanks Simon for that idea.

However now I have one question. As I've had to removed the silver foil or whatever that shiny stuff is i.e. above the first exhaust box, I have the rest of the liner in place without that shiny top covering; so what I want to know is whether that's OK to leave or whether I need to replace the whole exhaust heat shield?

Anyone have any views on this?

Thanks
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post #2 of 9 (permalink) Old 05-04-2013, 01:25 PM
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Sorry I cannot answer that one, I would expect whatever is in it would be flame retardent but I cannot guarantee it. I managed to push mine up enough so that it no longer touched without having to remove any of the foil.

Regards

Simon

www.custom300cshop.co.uk
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post #3 of 9 (permalink) Old 05-04-2013, 01:35 PM
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I'd be a bit hesitant about removing heat shielding

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post #4 of 9 (permalink) Old 05-05-2013, 12:23 AM
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We remove the heatshield on loads of cars,not had any comebacks so far.....it's normally the rear ones that we rip out though


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post #5 of 9 (permalink) Old 05-05-2013, 03:24 AM
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I would be very wary about running without it myself. Temperature gets up to about 700 Deg C when a DPF regen is taking place. That information alone is enough for me think it needs a heat shield.

Just as general info: 700 Deg C is a high enough temperature for mild steel to glow a dull red.

Jack

Last edited by jackwalton; 05-05-2013 at 03:27 AM.
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post #6 of 9 (permalink) Old 05-05-2013, 05:18 AM
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I don't think he has removed the heat shield itself, I think he means he has had to remove the really thin foil (thinner than the cheapest tin foil you can buy) coating from the surface leaving the woollen type filling exposed.

Its nothing like the thick solid aluminium heat shields you see, it's more like a wadding coated with a skin of shiny thin foil.
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post #7 of 9 (permalink) Old 05-05-2013, 05:48 AM
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Quote:
Originally Posted by Simon@thecustom300cshop View Post
I don't think he has removed the heat shield itself, I think he means he has had to remove the really thin foil (thinner than the cheapest tin foil you can buy) coating from the surface leaving the woollen type filling exposed.

Its nothing like the thick solid aluminium heat shields you see, it's more like a wadding coated with a skin of shiny thin foil.
Yes Simon I jumped to the wrong conclusion about the heat shield removal, sorry.

The foil will be there to reflect and protect the actual shield, the wadding.
The wadding will slowly get eaten away with weathering and air movement under the car but will withstand the heat OK until it slowly deteriorates.

Really needs some attention but not too urgent, the wadding will slowly deteriorate though.
Self Adhesive heat shield is available in various thicknesses but I dont know how well it sticks. I assume it is OK because its made specifically for exhaust shields.

Jack

Last edited by jackwalton; 05-05-2013 at 06:17 AM. Reason: Added Self adhesive shields.
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post #8 of 9 (permalink) Old 05-05-2013, 07:43 AM Thread Starter
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Hi guys thanks for the thoughts. Simon's correct it's just the thin tinfoil/shiny layer that's come off, the wadding and whatever the backing to that is still in place above the prop/exhaust.

Jack thanks for the thought, seems to make sense to look into that self adhesive heat shield; do you know of a good place to get some?
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post #9 of 9 (permalink) Old 05-05-2013, 08:08 AM
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Quote:
Originally Posted by DGO View Post
Hi guys thanks for the thoughts. Simon's correct it's just the thin tinfoil/shiny layer that's come off, the wadding and whatever the backing to that is still in place above the prop/exhaust.

Jack thanks for the thought, seems to make sense to look into that self adhesive heat shield; do you know of a good place to get some?
Lots available if you do a search on Google. I would go for one that specifies the temperature rating rather than just buy some "heat shield".
Plenty rated at around 1750 Deg F and above which would be fine for our cars.

Also many listed on ebay.

Jack
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