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How important are heat shields above car exhaust?
Posted by: Acer
Date: August 29, 2020 07:42PM
My Prius (2010, 106K miles) has lost its second heat shield section. These things rot right at the bolts and make an awful rattle. I yanked it out. Will my floor melt?
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Re: How important are heat shields above car exhaust?
Posted by: Speedy
Date: August 29, 2020 07:45PM
I was sitting in a car with the engine running and the area above the cat converter caught fire. I would replace it.



Saint Cloud, Minnesota, where the weather is wonderful even when it isn't.
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Re: How important are heat shields above car exhaust?
Posted by: Sarcany
Date: August 29, 2020 07:58PM
[www.cartalk.com]

The heat shield is there to keep your 400-degrees-F muffler from setting fire to the wheat field you're parking in. It's also there to keep it from setting fire to the contents of your trunk.

It wraps around the muffler and, depending on the car, the muffler can be pretty close to the underside of the trunk. We've seen instances where people have come in complaining of a burning smell, and we've found the underside of the carpet in their trunk melted. We haven't found a set of golf clubs fused together yet, but we have seen evidence of significant heat.

Now, maybe your car is one of those where the muffler isn't right up against the underside of the car. But we don't know. And here's the other thing to consider: The heat shield -- on most cars -- is welded to the muffler. And when the heat shield starts to disintegrate to the point that the noise is annoying you, the demise of the muffler is not far behind.

So my recommendation would be to go ahead and replace the muffler. It'll come with a new heat shield, and you'll probably need it soon anyway.


...Looks like the Prius has a heat shield above the catalytic converter.

Same principle.

Fix it and check out the catalytic converter to see if it's rusted through.







Edited 1 time(s). Last edit at 08/29/2020 08:03PM by Sarcany.
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Re: How important are heat shields above car exhaust?
Posted by: lost in space
Date: August 29, 2020 08:17PM
If Toyota could have left it out, they would have.



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Re: How important are heat shields above car exhaust?
Posted by: macphanatic
Date: August 30, 2020 09:00AM
Did it rust away around the bolt that secures it to the frame/bracket? I had the issue with a Honda. Pulled the bolt and used an oversized washer with the bolt to secure it.
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Re: How important are heat shields above car exhaust?
Posted by: Acer
Date: August 30, 2020 09:06AM
Yes, it looks like galvanic corrosion, the heat shield dissolves right around the bolts. I'll have to have a garage fix it, there's just not enough room under it for me to fight with rusty bolts, even up on ramps.
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Re: How important are heat shields above car exhaust?
Posted by: Carm
Date: August 30, 2020 12:37PM
Quote
lost in space
If Toyota could have left it out, they would have.
Yes
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Re: How important are heat shields above car exhaust?
Posted by: mrbigstuff
Date: August 30, 2020 05:29PM
A car can still set fire to organic matter underneath in the right circumstances, heat shield or no.
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Re: How important are heat shields above car exhaust?
Posted by: Todd's keyboard
Date: August 30, 2020 11:54PM
My understanding is that the 1978 fire at Arcosanti was caused by a hot exhaust system of a car that parked over a field of dry grass.

Todd’s catalytic keyboard
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