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  • 1 Post By DanEC
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Old 12-17-2019, 07:50 AM
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Default Loosen the front left exhaust manifold screw

Since I want to replace my leaky manifold gasket, I have to remove the exhaust manifold. Unfortunately, the front screw cannot be loosened. Is there a special key, the cutting disc or does someone have a screw-friendly solution ...
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Old 12-17-2019, 07:55 AM
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Loosen all the other bolts so that as you loosen the problem bolt, the manifold can be pulled away from the head.
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Old 12-17-2019, 08:04 AM
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With the ERA Cobra, each cylinder has its own manifold pipe. I will try it, thank you very much
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Old 12-17-2019, 10:28 AM
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Quote:
Originally Posted by cobra View Post
Since I want to replace my leaky manifold gasket, I have to remove the exhaust manifold. Unfortunately, the front screw cannot be loosened. Is there a special key, the cutting disc or does someone have a screw-friendly solution ...
There are instructions in the ERA manual for bending a tool to deal with the exhaust manifold bolts. You'll find the instructions, and a graphic, around page 28, but just do a search for "Heat and Bend" and it will pop right up.
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Old 12-17-2019, 11:03 AM
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Old 12-17-2019, 10:05 PM
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Thank you Patrickt
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Old 12-18-2019, 05:19 AM
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Hard to tell from the picture but a closed end wrench may not clear the dimple in the pipe. If not then you might try a line wrench for tightening brake line and fuel lines. To give it more grip on the bolt if it feels like it's not gripping the head tight enough, I sometime clamp vice grips across the wrench to keep the jaws from spreading under pressure. I would look for some smaller head, 12-pont header bolts. I used ARP bolts. These are 6-point but I thought I found 12-point. Will have to look at my car.

https://www.jegs.com/i/ARP/070/100-1...QaAm93EALw_wcB

Seems like there were two lengths available and I used the longer one due to the combined thickness of the header flange and copper gasket.
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Old 12-18-2019, 05:23 AM
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Here are the 12-point but you would need to be sure of the size bolt needed for a Ford FE.

https://www.walmart.com/ip/ARP-10012...gaAggpEALw_wcB
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Old 12-18-2019, 07:14 AM
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Quote:
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Hard to tell from the picture but a closed end wrench may not clear the dimple in the pipe.
In that case, I might try using a cut-off wheel to turn the closed-end wrench to an "almost closed end wrench" with just enough of the circle end cut off to fit the bolt and turn it.
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Old 12-18-2019, 08:25 AM
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Looks like it was put on with vice grips because of lack of clearance. I'd try that, then cut it off if nec. Prolly will come right off after cutting the head off. Also some heat probably will help.
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Old 12-18-2019, 09:07 AM
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Patrick; I think that wrench was intended for the left rear top bolt, not the front.

One way that works for me when I only have one stubborn bolt is to remove all the others, and then twist the part you want to come off CCW.

In this case one would probably have to remove the adjacent primary pipe and the lower bolt of the pipe in question. Then rotate the pipe to loosen the bolt. Once it starts to turn, an open wrench should work.
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Old 12-18-2019, 09:17 AM
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Quote:
Originally Posted by Argess View Post
In this case one would probably have to remove the adjacent primary pipe and the lower bolt of the pipe in question. Then rotate the pipe to loosen the bolt. Once it starts to turn, an open wrench should work.
I think that's a good plan. The more I look at his pic, it seems that the divot in the primary pipe just doesn't even line up right under the bolt.
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Old 12-18-2019, 09:25 AM
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When you reinstall the side pipes, be sure to use a little teflon thread sealant so you're less likely to have the same problem next time. Also, the header bolt shown in your picture uses a 7/16" wrench. Switch to bolts that have a 3/8" head (ARP makes them). That will allow you to use a box end wrench rather than an open end wrench.
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Old 12-18-2019, 04:29 PM
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Is it feasible to use heat and a hammer, or just a hammer, to increase the size of the dimple/divet in the pipe so that you can use a ring spanner (closed-end wrench) instead of an open ended spanner?

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Old 12-18-2019, 04:34 PM
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I just watched a Roadkill Garage episode where they bashed in the primary pipes with a hammer and claimed it had no effect whatsoever on the performance of the engine.
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Old 12-18-2019, 04:52 PM
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I wouldn't trust the road kill guys scientific methods.
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Old 12-18-2019, 07:03 PM
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Quote:
Originally Posted by CJ428CJ View Post
When you reinstall the side pipes, be sure to use a little teflon thread sealant so you're less likely to have the same problem next time. Also, the header bolt shown in your picture uses a 7/16" wrench. Switch to bolts that have a 3/8" head (ARP makes them). That will allow you to use a box end wrench rather than an open end wrench.
I can't check my car because it's in a bag for winter storage but I'm pretty sure I have the 3/8" ARP bolts and don't have a problem getting a box end wrench on any of them, so this is good advice.
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