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Sealing case and cylinders?
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1955ccbug
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PostPosted: Thu Jun 25, 2009 7:49 am    Post subject: Reply with quote

Do you guys use anything on the oil pump to pump cover gaskets? I used a ultra light film of gray RTV last time and still get drips. Or do you install them dry? Thanks. BTW, this is a brand new CB pump and cover..I'd hope it wasn't warped, but I didn't check.
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busman78
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PostPosted: Thu Jun 25, 2009 9:29 am    Post subject: Reply with quote

Best to check the cover and pump body on a flat surface with some 220 grit wet with a light oil and figure 8 it till it is flat.
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1955ccbug
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PostPosted: Sun Jun 28, 2009 9:34 am    Post subject: Reply with quote

Sealant on the oil pump cover gasket?
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Sigurd
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PostPosted: Sun Jun 28, 2009 9:41 am    Post subject: Reply with quote

I would.
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GeorgeL
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PostPosted: Sun Jun 28, 2009 3:13 pm    Post subject: Reply with quote

1955ccbug wrote:
Sealant on the oil pump cover gasket?


A thin film of Hylomar wouldn't hurt. My Meximotor arrived with what looked suspiciously like Hylomar on the case joint and just about every gasket joint. It hasn't leaked yet.
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1955ccbug
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PostPosted: Fri Jul 03, 2009 10:34 pm    Post subject: Reply with quote

Thank you.
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Lag_Smurf
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PostPosted: Sat Jul 18, 2009 9:10 am    Post subject: Reply with quote

Hylomar UBRF and you will never use anything else.

http://www.reliablevdub.com/hylomar/
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GeorgeL
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PostPosted: Sat Jul 18, 2009 1:12 pm    Post subject: Reply with quote

Here's a case study:

http://www.ehylomar.com/Sealing-VW-Engine-with-Hylomar-UB?sc=7&category=34

Please note that Hylomar comes in several different formulations.

Universal Blue is the acetone-solvent formula which will thicken after application. You can get it from Harley Davidson dealers under part number 99653-85.

Racing formula (RF) has lower viscosity and will also thicken. It uses the same acetone solvent as Universal Blue It is the one commonly marketed through Harbor Freight and other automotive sources. Permatex has recently begun distributing this formula in blister packs.

Advanced Formula (AF or HPF) is runnier still and does not thicken. It is available in tubes or brush-top cans, but is harder to find. This is the formula previously distributed by Permatex.

Aerograde (PL-32) is the original Rolls Royce formulation with methylene chloride solvent. It's expensive and can't be sold in some states with wussy environmental regulations. In these states you will find it with acetone solvent as Aerograde Ultra.

So, which one to use? I've used them all and while they have different consistencies they all seem to seal well. My personal preference is the Universal Blue whose higher viscosity makes getting a thin but even layer on a joint surface easier. It think it really boils down to what you get used to.

Most of these come in squeeze tubes of either 35ml (1.2 ounce) or 75ml (3.0 ounce) capacity. These look the same in photographs, so be sure of which one you are looking at when buying. Prices are all over the place, too, so shop around and don't forget to add shipping costs to the total. Hylomar isn't that hard to find these days, but some sellers still think that those little tubes are made of gold.
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Stuggi
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PostPosted: Mon Aug 24, 2009 5:08 am    Post subject: Reply with quote

Sigurd wrote:
To my knowledge, there are no paper gaskets for the bigger cylinders. When I did my 94s, I dabbed a little on the lip that sits on the case. Don't put any on the part of the cylinder that slides into the case.


Ever heard of gasket paper? Cut out the shape you need, smear both sides and the sealing surfaces with Permatex Aviation and off you go.
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Sigurd
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PostPosted: Tue Aug 25, 2009 7:39 am    Post subject: Reply with quote

Hm. I hadn't thought of that. My 3/4 side is doing fine with red RTV, but the 1/2 side didn't like the RTV for some reason.
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Sigurd
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PostPosted: Thu Sep 10, 2009 5:55 am    Post subject: Reply with quote

I figured out why the one side was leaking. The front edge of the cylinder bores were all 0.008" lower than the rear edge. The cylinders were tipped towards the front! Now that it's been re-bored, I'll probably use the RTV again.

I will place another vote for Curil T. The stuff literally melts away with brake cleaner and a paper towel. No leaks on the parting line either.
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Stuggi
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PostPosted: Thu Sep 10, 2009 6:02 am    Post subject: Reply with quote

I'm not a big fan of RTV as it's not a flange sealant but more of a "form-a-gasket" type of thing. If you need a good RTV, I recommend Loctite 5910, it's developed for engine oils, and it's real good for swing axle boots as well.
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Sigurd
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PostPosted: Fri Sep 11, 2009 6:45 am    Post subject: Reply with quote

I'm only using it because Permatex Aviation and paper gaskets leaked on my singleport. Would Curil T work here instead?
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Stuggi
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PostPosted: Fri Sep 11, 2009 10:24 am    Post subject: Reply with quote

Dunno, I have no experience with Curil T, but it seems to have good rep around here.

Permatex Aviation is IMHO the best stuff, seals everything really nice. I usually coat both sides of the gasket (if used) and the sealing surfaces, nice "thick" layer.
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modok
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PostPosted: Fri Mar 05, 2010 10:36 pm    Post subject: Reply with quote

In reverence of all this heated sealant bla bla bla, I conducted my own experiment last year.
I sealed the case halves of my engine together with....................Ketchup.
Yes ketchup.
I'm not kidding.
I've been driving it long enough that I think the results are in.
So, what do you think happened?
Guess the outcome of my experiment!!
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Sanny
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PostPosted: Fri Mar 05, 2010 11:03 pm    Post subject: Reply with quote

uuuhhh..... the engine produced an order of fries? Laughing
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modok
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PostPosted: Fri Mar 05, 2010 11:05 pm    Post subject: Reply with quote

I wish.
I was going to use barbecue sauce at first, but I decided ketchup is more standardized. I prefer barbecue sauce myself.
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Sigurd
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PostPosted: Fri Mar 05, 2010 11:37 pm    Post subject: Reply with quote

It's so nuts, I think it might have worked.
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GeorgeL
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PostPosted: Sat Mar 06, 2010 1:37 pm    Post subject: Reply with quote

Well, ketchup has a healthy dose of vinegar (acetic acid).

So, for well-cleaned case halves, they may well get a chemical reaction between the acid and the metal that results in a good solid seal. The reaction products on both sealing surfaces would occupy the same space and become one mass.

If it did, don't count on getting a good seal the second time. In fact, getting the cases split may be problematical if they become too well married by the chemical reaction!

Please, nobody tell GEX about this!
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modok
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PostPosted: Sat Mar 06, 2010 1:42 pm    Post subject: Reply with quote

WOW, that's profound.
I'm not sure I buy it though, silicone is chock full of this acid, and does not seem to do any harm.
I promise I will report back next time I split it.
Ok, the "acid theory" seems to warrant further study.
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