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Author Topic: exhaust manifold to down pipe  (Read 15047 times)

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Sandman87

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exhaust manifold to down pipe
« on: November 04, 2019, 07:20:33 pm »
hello every one im back at it !! but i have a question .... 3.4 swap what size bolt do i need to attache exhust manifolds to down pipe legnth with thread pitchh all that jazz . and do i need gaskets or springs ? also things do not line up perfectly is this normal ? shpuld i just use a persuader and make it fit off about .25 of an inch





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Mike

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Re: exhaust manifold to down pipe
« Reply #1 on: November 04, 2019, 07:26:22 pm »

There is a donut gasket that goes inside the flange area.  The Fiero Store has the donut and the bolts and springs that are needed.

https://www.fierostore.com/Product/Detail.aspx?s=54501&d=388&p=1

Misalignment can be caused by several things.  The lower part of the exhaust has springs that suspend it.  They could be pulling or the lower exhaust sections could be bent or out of position due to removal of the converter and rewelding out of position.

Bad transmission mounts can cause it to be out of alignment, too.  The upper Y pipe seldom gets bent so it's probably correct.  When we put Aerodonamic back together, we had to loosen the Y pipe at the exhaust manifolds, install the downpipe bolts and springs then pull everything together.
  BTW, NoMad is looking for the ESC  Knock sensor if you're not using yours. 
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GTRS Fiero

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Re: exhaust manifold to down pipe
« Reply #2 on: November 04, 2019, 07:30:48 pm »
Well, I had posted in the other thread that the manifolds should be level, but appear not to be, in the pictures.
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Sandman87

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exhaust manifold to down pipe
« Reply #3 on: November 04, 2019, 07:32:04 pm »






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Mike

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Re: exhaust manifold to down pipe
« Reply #4 on: November 04, 2019, 07:32:49 pm »
Oh.  If the manifolds aren't level, the lower end of the engine may be too far forward.
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Sandman87

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exhaust manifold to down pipe
« Reply #5 on: November 04, 2019, 07:33:35 pm »
thank you for your help i wire tied them in place do these picture help ?
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Mike

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Re: exhaust manifold to down pipe
« Reply #6 on: November 04, 2019, 07:34:31 pm »
The chrome upper intake manifolds work for the exhaust log bolts.  Or, use the Saturn Vue manifold bolts.
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Fierofool

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Re: exhaust manifold to down pipe
« Reply #7 on: November 04, 2019, 07:38:58 pm »
Sorry, I thought it was downpipe to exhaust but you're talking about Y pipe to exhaust manifold.  There is no gasket or springs in that joint.  It's just a bell fit.  But again, The Fiero Store has the correct bolts.   https://www.fierostore.com/Product/Detail.aspx?s=66450&d=388&p=2

We loosely installed them, then put the downpipe to exhaust bolts and springs in place and pulled everything together.  The Y pipe to manifold bolts were the last things tightened, I believe.  At least in our case. 
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GTRS Fiero

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Re: exhaust manifold to down pipe
« Reply #8 on: November 04, 2019, 07:39:57 pm »
Judging by the condition of the bolt, you may want to clean the threads on the manifolt.  Be warned that the bolts are very easy to cross-thread on install.
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Sandman87

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exhaust manifold to down pipe
« Reply #9 on: November 04, 2019, 07:40:37 pm »
the down pipe is not connected to any other part of the exhust . its like to y of the down pipe has shrunk .all engine and trans mounts are installed and line up .forgive me but im not understanding how the engine is not sitting right .previous owner cut the cat out .







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Mike

Sandman87

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exhaust manifold to down pipe
« Reply #10 on: November 04, 2019, 07:43:58 pm »
yeah i have one bolt .i was fearfull of cross threading . thats why i was hoping to get the bolt size size .i will visit store and purchase new bolts . gonna have exhust shop "replace cat" and connect it to muffler
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Mike

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Re: exhaust manifold to down pipe
« Reply #11 on: November 04, 2019, 07:45:15 pm »
Holy cow!  That dog bone is adjusted really far out!
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Sandman87

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exhaust manifold to down pipe
« Reply #12 on: November 04, 2019, 07:46:48 pm »
so as for it not lining up should i force it ? i dont want to crack the manifold . its already a replacement as the old one was cracked
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Mike

Sandman87

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Re: exhaust manifold to down pipe
« Reply #13 on: November 04, 2019, 07:48:06 pm »
should i pull the dog bone back ? what would cause that . it is a 3.4 swap . is that not normal?
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Sandman87

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exhaust manifold to down pipe
« Reply #14 on: November 04, 2019, 07:49:31 pm »
there is still an inch plus of thread in the dog bone
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Mike
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