O Ring Manifold leak

Help needed for leaking manifold

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rozemab
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Re: O Ring Manifold leak

#16

Post by rozemab » Sun Sep 16, 2018 1:55 am

ozwick86 wrote:
Sat Sep 15, 2018 4:18 pm
Manifold flange and carb flange are both mated and are good. The same for the insulator. Anyways, so far I only sprayed at the manifold-head area and it reacts. Strong improvement to the initial situation, but you still hear the engine reacting a tiny bit.
As Excalibur said, you need to attach the manifold adaptor and apply 10 psi to it and spray the entire area with soapy water for the bubble test. You may have a porosity in the manifold or manifold flange and O-Rings.
+1 brand new manifold, I had to argue with the eBay seller on getting it returned. Bad casting!!
C2199F2F-F4BE-45DD-8D61-A69E17EB9763.jpeg
C2199F2F-F4BE-45DD-8D61-A69E17EB9763.jpeg (571.31 KiB) Viewed 182 times



Buddhahoodvatoloco
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Re: O Ring Manifold leak

#17

Post by Buddhahoodvatoloco » Sun Sep 16, 2018 2:16 am

Radical, thanks for the visual..
rozemab wrote:
Sun Sep 16, 2018 1:55 am
ozwick86 wrote:
Sat Sep 15, 2018 4:18 pm
Manifold flange and carb flange are both mated and are good. The same for the insulator. Anyways, so far I only sprayed at the manifold-head area and it reacts. Strong improvement to the initial situation, but you still hear the engine reacting a tiny bit.
As Excalibur said, you need to attach the manifold adaptor and apply 10 psi to it and spray the entire area with soapy water for the bubble test. You may have a porosity in the manifold or manifold flange and O-Rings.
+1 brand new manifold, I had to argue with the eBay seller on getting it returned. Bad casting!!

C2199F2F-F4BE-45DD-8D61-A69E17EB9763.jpeg

Excalibur
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Re: O Ring Manifold leak

#18

Post by Excalibur » Sun Sep 16, 2018 4:36 am

Just to add to what's already been said, areas at the throttle spindle and low speed needle will also suck... or at least they do on mine IIRC. If I spray at or close to these places, engine idle gets affected. These days I prefer the 10psi pressure test method because it's much more definitive.
Hope this helps. Good luck.

bavarian_knuckle
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Re: O Ring Manifold leak

#19

Post by bavarian_knuckle » Sun Sep 16, 2018 7:09 am

thanks guys, you got me convinced

I`ll let you know once I got the tool.

cheers
Klaus

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Re: O Ring Manifold leak

#20

Post by nmaineron » Sun Sep 16, 2018 1:08 pm

I'm with Socalrider, that's the only way to get the best fit.I like to put dish soap on my rings,it keeps the clamps from pinching the rings.Ideally you should be able to get a seal without the clamps,they just hold the manifold in place.

fredotwowheels
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Re: O Ring Manifold leak

#21

Post by fredotwowheels » Sun Sep 16, 2018 7:55 pm

I use this stuff you can find at Autozone called GOOP. It is kind of like the type of epoxy that is used to stick your credit card to the paper when you get one in the mail. I put it all around the manifold rings so they are pretty covered then put the clamps on and let it sit a day. The GOOP is clear so it never really looks messy and it rubs off easy enough when you need to clean up and reapply after removing the manifold for anything.

rozemab
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Re: O Ring Manifold leak

#22

Post by rozemab » Sun Sep 16, 2018 11:53 pm


ozwick86
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Re: O Ring Manifold leak

#23

Post by ozwick86 » Mon Sep 17, 2018 4:45 am

fredotwowheels,
I use this stuff you can find at Autozone called GOOP. It is kind of like the type of epoxy that is used to stick your credit card to the paper when you get one in the mail. I put it all around the manifold rings so they are pretty covered then put the clamps on and let it sit a day. The GOOP is clear so it never really looks messy and it rubs off easy enough when you need to clean up and reapply after removing the manifold for anything.
The Orings is what is supposed to seal the manifold. Why add other sealant to the area? The manifold had a porosity which is one of the reasons why there is a vacuum leak.

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Re: O Ring Manifold leak

#24

Post by RooDog » Mon Sep 17, 2018 12:40 pm

Just a little comment: I had erratic idling behavior from my big inch Evo with S&S G model carb. Nothing major just annoying changes in idle speed every now and then. I reached up under the tanks to the carb to manifold bolts with a long extension socket wrench and just barely moved the bolts, like maybe 5-10*, and that was all it took to stop the idle probs. And the carb, spacer, and manifold seal together with O rings rather than gaskets. A small vacuum leak can be down right annoying.... RooDog

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Re: O Ring Manifold leak

#25

Post by kfelt » Tue Sep 18, 2018 1:26 pm

I'm with Gotnoclass...if it ain't broke...

fredotwowheels
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Re: O Ring Manifold leak

#26

Post by fredotwowheels » Wed Sep 19, 2018 6:48 pm

ozwick86 wrote:
Mon Sep 17, 2018 4:45 am
fredotwowheels,
I use this stuff you can find at Autozone called GOOP. It is kind of like the type of epoxy that is used to stick your credit card to the paper when you get one in the mail. I put it all around the manifold rings so they are pretty covered then put the clamps on and let it sit a day. The GOOP is clear so it never really looks messy and it rubs off easy enough when you need to clean up and reapply after removing the manifold for anything.
The Orings is what is supposed to seal the manifold. Why add other sealant to the area? The manifold had a porosity which is one of the reasons why there is a vacuum leak.
If torque is supposed to hold down bolts, why use threadlock? Sometimes you add things a bit to reduce a headache. They had o-rings and clamps because thats all they had, it isn't exactly the best design they ever came up with, why fight something simple that treats the symptom?

In this specific instance, his manifold may have been the issue, but that doesnt help the ten other people that find this thread looking for help where their issue is the o-rings leaking. Hence me providing the tip that saved me from pulling heads - again.

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