('03-'05) Flange Gasket Help - Subaru Forester Owners Forum
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post #1 of 8 (permalink) Old 04-24-2019, 12:10 PM Thread Starter
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Flange Gasket Help

2005 FX looking to mate a (NEW) intermediate pipe to existing custom Axelback.

Received flange gasket from Rock Auto but deformity in axel-back will not mate properly. I did a pressure test with a shop vac and it leaks ever so slightly ( You could not tell with your naked eye but can feel the air come through.

(I cleaned both surfaces extremely well)



It seems a thicker gasket would fix this issue?????

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post #2 of 8 (permalink) Old 04-24-2019, 01:17 PM
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@BigOtuna coat all the surfaces with silicone RTV, red or black. You may have to double up the gaskets?

Make sure you allow the silicone RTV to cure before running the engine.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]


'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
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post #3 of 8 (permalink) Old 04-24-2019, 03:33 PM
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What resonator (intermediate pipe, I assume) brand did you use?

I recently replaced my resonator and axle back muffler. Hangers were off some, and in my case, the problem was the donut and junction at the catalytic unit. Had a boat load of trouble getting things to be tight.

I got supposed stainless stuff from amazon from Northeastern Exhaust. Had china as origin when I got it. Was nice looking stuff generally. Too bad that front flange was off by 3/16" or so..... Hangers I bent around on and generally got them to line up.

I agree with @2.5x_sleeper suggestion as well.....

05 Forester x, 14 Prius, 12 Leaf, 65 Ford F100
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post #4 of 8 (permalink) Old 04-24-2019, 05:22 PM Thread Starter
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Quote:
Originally Posted by 2.5x_sleeper View Post
You may have to double up the gaskets?
Is this an option?? I have 2 gaskets but lack the RTV?? Hmmmm

Quote:
Originally Posted by cdherman View Post
What resonator (intermediate pipe, I assume) brand did you use?
Bosal Intermediate pipe off rock auto.. It seems nice


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post #5 of 8 (permalink) Old 04-24-2019, 06:20 PM
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Quote:
Originally Posted by BigOtuna View Post
Is this an option?? I have 2 gaskets but lack the RTV?? Hmmmm
Yes, you could try just the 2 gaskets. The silicone RTV would give you a better seal, but you could apply that later on if you need it.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
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post #6 of 8 (permalink) Old 04-24-2019, 06:46 PM Thread Starter
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Ok So two gaskets was better. My dad had always told me to stay away from double gaskets but it looks like its going to work fine,

Still the inner OCD in me feels the slightest air moving through the shop vac test. I'll get some Gasket maker and seal her up!


Thanks ya'll I'll keep ya posted with results
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post #7 of 8 (permalink) Old 04-24-2019, 08:06 PM
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@BigOtuna I totally agree with your dad, but sometimes, no choice!

If you coat all the surfaces with silicone RTV, it becomes one thick gasket.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]

'07 FSXT - COBB Surgeline dyno stock Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
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post #8 of 8 (permalink) Old 04-25-2019, 08:23 AM Thread Starter
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Quote:
Originally Posted by 2.5x_sleeper View Post
@BigOtuna I totally agree with your dad, but sometimes, no choice!

If you coat all the surfaces with silicone RTV, it becomes one thick gasket.

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]


Gasket maker put on this morning now to sit for 24 HRS!

Fingers crossed! We used plenty of product
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