PDA

View Full Version : 3.4 heat shield rattle


Beater
02-23-2009, 09:01 PM
Who else is this affecting or has had it happen, and what did you do about it?

I am referencing the header crossover pipe shield next to the firewall.

Seems there was a tsb for while it was under factory warranty, but that was some time ago.

thanks in advance

j

Red_Chili
02-24-2009, 09:01 AM
It's a pain to get to, to put it mildly. You sure the TSB was only during warranty?

No, I don't use the stocker.

Beater
02-24-2009, 09:33 AM
I am thinking cut it off, and use header wrap. Thoughts?

Red_Chili
02-24-2009, 11:01 AM
Well, from the University of Been There Done That....

You absolutely need the flex joint in the stock crossover. If you are thinking of just removing the shield from the stocker, and wrapping the result, that would approximate the setup on the Chili. Don't know about clearances with the T100 though. The thing gets HOT HOT so beware. I had an ebrake cable melt before I thought to reroute it and it wasn't even that close.

Beater
02-24-2009, 11:39 AM
There's nothing next to the damn thing, except the firewall, and that's substantially far away. Did you just zip wheel/pry it off?


The 3.4 in a t100 is akin to a 6cyl in an old f100. You could set up a camp for a few small children in there compared to the compartment on an 80 or 4runner

SteveH
02-24-2009, 01:09 PM
You could use a very large stainless steel hose clamp around the whole thing. I did this on a '90 F250 with a noisy heat sheild. If the heat shield is securely attached, but still makes noise (as does the cat. heat shield on my '98 4Runner) you could tap the shield with a hammer to upset its resonant frequency - basically, put dent in it. Tack-welding it back to the pipe is another option.

Steve

Beater
02-24-2009, 02:39 PM
You could use a very large stainless steel hose clamp around the whole thing. I did this on a '90 F250 with a noisy heat sheild. If the heat shield is securely attached, but still makes noise (as does the cat. heat shield on my '98 4Runner) you could tap the shield with a hammer to upset its resonant frequency - basically, put dent in it. Tack-welding it back to the pipe is another option.

Steve


gee never thought about welding it... lol

I can't see any cracks or anything in the shield, I have a c-clamp on one side, ghetto, but cool in a way, and it didn't get the harmonics cured. I like the hose clamp idea

j

SteveH
02-24-2009, 03:40 PM
The C clamp is fairly ghetto - have you considered using a pair of vice-grip pliers, instead? ;-)

Red_Chili
02-25-2009, 12:17 PM
There's nothing next to the damn thing, except the firewall, and that's substantially far away. Did you just zip wheel/pry it off?

Nope.
I removed all of the 4Runner around it and had someone reinstall another 4Runner to replace that one. I happened to have one in my garage.

In the process a custom crossover (larger OD) somehow found its way there. Glass wrapped of course.

Beater
04-22-2009, 07:27 PM
ok - so, come to find out, this is a common source of noise on the 3.4

Here's one fix:

Pry off the cheesy flange clamped excuse for a heat shield. There are 4 tacks, 2 on each end, but the come lose with a small prybar/chisel, just like the rest of this not worth being made into an ashtray heatshield...

Beater
04-22-2009, 07:31 PM
next - wrap up the flex pipe in some good old hot-roddin' header wrap.. Dem fancy folk use stainless clamps, however, I use what's layin around of course, like some 12 gauge wire



no more rattly, hissy, marbles in a can noise!

j

Red_Chili
04-23-2009, 09:16 AM
Looks a lot like my very expensive custom version... LOL.

OK, mine is larger diameter. :lmao: