12HT making strange noise and exhaust manifold leak. (1 Viewer)

[Fey1]

Hello all,

I've just installed a 12HT in my FJ40 to replace the failed 2H. It was supposed to be a fairly straight forward swap. Generally everything went well. At the end of the 125 mile shake-down drive, I noticed a slight pop... pop... pop. This is confirmed to be an exhaust leak at the #1 cylinder manifold gasket.

On a subsequent, shorter drive (about 30 miles), I noticed that the leak has become much more pronounced, and it is now accompanied by a more metallic scraping noise indirect time with the popping of the manifold leak. I am now wondering what has gone wrong now. Any ideas?

Thanks!

 

[roscoFJ73]

Videos are notoriously hard for those not there to define a noise. Best to fix the leak and see what happens. I could hear a squeak .
Whats it like with the hood up in neutral and you hand throttle it?