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Old 09-28-2008, 11:59 AM
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Calling users of Permatex #2

Following oldbogie's advice, I think I've now fixed the oil leak from the rear of my SBC intake (thanks man). I previously used black RTV only on the 'china walls' and had a significant leak from the rear of the intake... enough to pool on the block and drip onto the floor after a drive. So, removed the intake and used the cork end seals with a little Permatex #2 (blobs in the corners and a thin bead on top of the cork seals). Didn't use any Permatex underneath the cork end seals, as they were self-adhesive.

My question is this... just how soft should Permatex #2 remain? I'm asking this because, even after letting it sit for 24-hours and heat-cycling the engine, it's still soft as anything. Where the squeeze-out is in the corners, I touch it and it hasn't even skinned-over. Does this sound right? Hope I haven't been sold an out-of-date tube. Just concerned it may start to leak or even 'blow out' after a while.

Thanks.

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Old 09-28-2008, 12:14 PM
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#2 is a non-hardening gasket SEALANT. Not a replacement for a gasket.

#1 is the hardening stuff.

You should have been just fine with a healthy bead of silicone on the 'china walls' (I've never heard of this name)

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Old 09-28-2008, 12:14 PM
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It should be almost as stiff as the chewing gum on the underside of a restaurant table by now. You should be able to put an imprint of your thumbnail in it, but it should not be soft and mushy.
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Old 09-28-2008, 12:23 PM
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I always dimple the china wall and intake china wall too, every 1/2inch, to help retain the solidified RTV. I never use gaskets. You can even drill 1/8" holes into the wall every 1/2 inch as retainers.
The surfaces should be CLEAN of any oil or finger prints, I use engine starting fluid to clean them, before putting on the RTV bead so it will stick to the wall and the manifold.
Let the bead set for 15-20 min then add a skim coat to the manifold wall to disolve the surface of the bead and bind the manifold to the bead, then set the manifold down onto the engine.
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Old 09-28-2008, 12:27 PM
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Cork gaskets were recommended by oldbogie and, it seems he was giving good advice as it's not leaking (so far).

Strange about the Permatex #2 still being so soft... will keep an eye on it (with fingers crossed).
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Old 09-28-2008, 12:53 PM
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Quote:
Originally Posted by v8hed
Cork gaskets were recommended by oldbogie and, it seems he was giving good advice as it's not leaking (so far).

Strange about the Permatex #2 still being so soft... will keep an eye on it (with fingers crossed).
It stays pretty soft.

Bogie
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Old 09-28-2008, 02:17 PM
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Quote:
Originally Posted by oldbogie
It stays pretty soft.

Bogie

Especially if it's a fairly new tube. It will take a few days to stiffen up a little.
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Old 09-28-2008, 02:32 PM
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Soft, like a _____.

No. 2 Permatex remains quite pliable (soft) for some time but will not stay that way forever. At least you're on your way to understanding there are other materials out there than RTV. I think I'd use windshield urethane before I used that doggone RTV, really, that's how much I hate it.
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