Hood insulation

I don't know the cost or part number but a call to the dealer may be the best bet.

 

Helps for soundproofing insulation?

 

Did you just use an undercoat gun?

 

I got ya …..I was just being lazy.
I’ll do some research and post it up

thanks again

 

Like Rainoffire said it does indeed fit shape-wise, but not all of the tabs line up. You can easily drill out more holes where necessary if you want more than 4 points for the buttons to hold.

So its nots a perfect fit but works fine. For sure reduces noise a bit and shows no sign of wear after 3 years.

part # 5334135161


DO NOT USE DYNAMAT OR ANY BUTYL SOUND INSULATION. IT MELTS AND FALLS OFF FROM ENGINE HEAT.

 

Looks like the factory 4 Runner piece is available for about $200. Some places are a bit cheaper, but they are higher on shipping costs. A local dealer purchase would save on shipping for sure. Another option would be a salvage yard.

below is a link to one supplier…..

https://parts.toyotaofnashua.com/oe...MIp_S9kP75_gIVs87jBx3HJAgIEAQYByABEgKs7fD_BwE

 

FYI. 4Runner hood insulation did very very little to reduce engine noise on my 20 Sport. Would probably help in the winter if I still lived in Calgary.

 

I actually have Dynamite Hood Insulator and some Butyl Sound Deadener on my hood, and has been there for 4 years now. They are pretty stuck there and I live in a constant 89.6F environment.

 

What color is you truck? I tried two types and both melted. (Black)

 

Quicksand.
I live at an apartment complex, so it is always out in the sun.
I made sure to clean the surface with isopropyl alcohol, then used a roller to really pressed in the sound deadener.
The Butyl Sound Deadener is Noico.

 

I was short on time, I was looking at an old thread and found some pics to post before heading out this am.

 

You can also just install Dynamat Hoodliner instead of a Butyl sound deadener. Since the Dynamat Hoodliner uses a very different adhesive, it shouldn't melt like Butyl when exposed to heat.

$89 Dynamat Hoodliner – Noise & Heat Insulation Kit for Your Car Hood – Keeps Engine Noise In & Protects Paint from Engine Heat – Easy Self Adhesive Install – 1 Sheet 32"x 54", 12 sq ft

https://www.amazon.com/dp/B00069QLVC

I just installed both cause I had a lot of extra sound deadener lying around.

 

What is the purpose of adding this?

 

One is sound insulation, it prevents some higher frequency noises from reaching the cab. Like the ticking sound from the injectors.

Other is heat insulation, prevents heat from rising and getting absorbed by the hood. Continuous heat cycles could cause the paint to fade or deteriorate faster.

 

I guess I've never heard these explanations before. I can't imagine heat is too much of an issue. The only time I notice is during the winter. Often times the sun will melt snow/ice faster than my engine at operating temp. I can't say my truck is any louder or quieter from the cab than other vehicles I've driven...engine wise, anyway. Wind noise is a whole different story.

 

There are reasons why a lot of vehicles, usually higher end cars, come with hood insulators from the factory. My old 1990 Cressida and LC80, and 2013 RAV4 came with hood insulators. But my 2010 Corolla and 2017 Tacoma did not.

A lot of techs that I have asked say it is mainly for noise reduction, as the hood is one giant flat piece of sheet metal that can resonate with the noises from the engine. Also why it only covers the flatter portion of the hood, instead of the entirety.

During operation, air is constantly flowing in the engine bay either naturally by driving or by the fan at standstill. However when the engine is off, that stored heat from every component would just rise up.

Much much older hood liners were also made with asbestos for both heat insulation and anti-fire.

 

The hood blanket from a 5th Generation 4Runner is a perfect fit for the 3rd Generation Tacoma, with one exception. The holes for the clips at the extreme corners are not drilled. You could drill the holes, or secure the corners with Velcro.

I decided not to add the hood blanket because (a) it's expensive, and (b) it's specifically not recommended by Toyota. They must have their reasons.

 

Did Toyota give a specific reason as to why it is not recommended for the Tacoma? Or is it because the Tacoma doesn't have one specifically made for it? The 4runner and Tundra have them. Even every car with the same 2gr-fks engine has them, apart from the Tacoma.

 

One thing you mentioned in your previous explanation to me was the hood resonating noise. One difference I noticed is that my Tacoma has a seal for the gap at the front of the hood while our 2019 4Runner does not. Not sure if this plays a factor or not since it would mean less air specifically affecting the hood.

I also know TFL asked Toyota about why the hood scoop was non-functional when the 3rd gen came out. They mentioned they didn't want to affect airflow under the hood and cited that their engine bays are about 20°C cooler than the competition (at least at the time). Not sure if any of these reasons play a factor though.

 

I think the newer 4runners also have the same rubber seal in-between the hood and radiator.


The comment on why the skewp is non-functional reminds me of the same reasons they gave for all the fake air vents on the Supra.