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Old 08-12-2022, 02:39 PM #1
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How important is this heat shield?

So drove from DC to Crystal Coast NC...about a 6-hour drive. There was a stretch where I hit 100mph. Upon arrival, there was an awful racket under the truck. Didnt seem to be functional though so drove back.

Today I was able to get under the car and found that the heat shield that sits above the exhaust pipe on the right rear had completely broken loose and was resting on the exhaust pipe. I was able to shimmy it out. Guessing the force of air at 100mph probably broke it loose. It's aluminum so no apparent corrosion.

It's obviously there for a reason, but how important is it?

I have a 3 hour drive to the beach tomorrow and then back next weekend. I'm sure I'm ok to make that drive but I'm wondering if this is something I even need to bother replacing at all or if I'm going to blow up driving down the road at some point because of heat damage

4runner exhaust heat shield
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Old 08-12-2022, 03:47 PM #2
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Mine came off as well, never thought about replacing it. You are right, it does make quite a racket.
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Old 08-12-2022, 04:42 PM #3
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might matter when summer is in full swing again.. if you got it just put it back on
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Old 08-12-2022, 06:48 PM #4
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Rusty cover looking thing fell off undercarriage

Heat shields falling off
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Old 08-12-2022, 07:20 PM #5
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Quote:
Originally Posted by 1jzgte View Post
might matter when summer is in full swing again.. if you got it just put it back on
dont think summer temps have any effect on how hot the exhaust is getting
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Old 08-12-2022, 09:10 PM #6
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Quote:
Originally Posted by DarthYota View Post
So drove from DC to Crystal Coast NC...about a 6-hour drive. There was a stretch where I hit 100mph. Upon arrival, there was an awful racket under the truck. Didnt seem to be functional though so drove back.

Today I was able to get under the car and found that the heat shield that sits above the exhaust pipe on the right rear had completely broken loose and was resting on the exhaust pipe. I was able to shimmy it out. Guessing the force of air at 100mph probably broke it loose. It's aluminum so no apparent corrosion.

It's obviously there for a reason, but how important is it?

I have a 3 hour drive to the beach tomorrow and then back next weekend. I'm sure I'm ok to make that drive but I'm wondering if this is something I even need to bother replacing at all or if I'm going to blow up driving down the road at some point because of heat damage

4runner exhaust heat shield
Is there any way you can put some bolts with washers on each side and nuts to re-secure it?
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Old 08-12-2022, 09:28 PM #7
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No hurry

When driving there is plenty of airflow to keep the area cool. But I would get it reinstalled bc stop n go traffic will cause things to get hot.
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Old 08-13-2022, 12:01 AM #8
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Quote:
Originally Posted by Jetguy77 View Post
When driving there is plenty of airflow to keep the area cool. But I would get it reinstalled bc stop n go traffic will cause things to get hot.
good point and living in DC metro area that's pretty regular!
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Old 08-13-2022, 12:08 AM #9
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Quote:
Originally Posted by Saker View Post
Is there any way you can put some bolts with washers on each side and nuts to re-secure it?
I supposed I could. It took a bit to get it out so I wonder if I would have to drop the catback to get it on. If that's the case wondering if the ROI is worth it.
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Old 08-13-2022, 11:06 AM #10
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If Toyota could save a penny by NOT installing something that wasn't deemed necessary, they would. Personally, I would reinstall with washers, etc. Or replace it.
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Old 08-13-2022, 02:11 PM #11
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Iíve been without mine for almost 2 years, you will have no issues running without it.


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Old 08-13-2022, 02:44 PM #12
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Quote:
Originally Posted by honda250xtitan View Post
dont think summer temps have any effect on how hot the exhaust is getting
why wouldn't it when the exhaust heat is rising into the cabin or maybe wait til after winter to install and use it as temp seat or feet warmers?
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Old 08-13-2022, 04:32 PM #13
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How important is this heat shield?

Iíve also been without two of the shields for a few years now (also in DC) with no apparent issues. I think youíll be good. Cheers


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Old 08-13-2022, 04:37 PM #14
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When I think of heat shields, I think of the space shuttle Columbia (obviously a terrible tragedy).
Point is, if you have it, no reason not to out it back on. Toyota would not have spent the money engineering it, if it was not needed or beneficial. Its not a cosmetic part, so it does serve a function.
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Old 08-13-2022, 06:44 PM #15
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