Sealant for breather box cork gasket?

[THall]

I'm installing a new cork gasket for the chimney breather box on my '78 2.0 FI engine. Is it recommended to use any type of sealer between the case and gasket and/or gasket and box?

Not positive, but I think in the Raby Bug Me video he installs it without?
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'78 Westy - 2.0 FI

[busdaddy]

A little grease on the engine side is all it needs, maybe some Permatex 2 or Curil T on the breather box side if you wish. Treat it like a rocker cover gasket.
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[hazetguy]

half tube of red silicon will do the trick.
(this is sarcasm ^^)


i need to do this job on a customer's bus, and I plan on using either Curil T or a very thin smear of permatex ultra-black for the gasket to box, then grease from gasket to engine case. of course all sealing surfaces will be cleaned and degreased thoroughly prior to installation.
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[busman78]

I have never used any sealant there, no need, vapor only, if you have any oily film then your crankcase has too much pressure and that needs taken care of.

[raygreenwood]

The cork gasket on the breather box is a BIG source of vacuum/gas leak. Not big in volume....but chronic. This is not as big of an issue with L-jet as it is with D-jet because you do not have straight manifold vacuum to the case.

I take any of the Permatex ultra....but Ultra black is the most oil resistant....and run a thin even layer on the box side only. Apply it to the box and set the box into postion on the case nice and square with just a little bit of weight. You do not want to squeeze the sealer out. Let it dry. The cork seal is perfectly adhered now to the breather box.

Apply a paper thin, smooth layer of Ultra black to the case side of the gasket. I use a roller so its a perfect layer. Takes about 30 seconds. Just let it dry. Do not attache it to the case until its dry. You are not trying to glue it to the case.

The RTV makes a very thin compressible sealing layer....that does not allow the oil to attack the rubber compound the cork gasket is made of....so it stays pliable for ages...and also prevents most of the shrinkage it gets with age.

The cork gasket can easily seal perfectly for over 100k miles this way.
Ray

[tootype2crazy]

[raygreenwood]

[ivwshane]

Sorry to hijack this thread.

I'm refurbing my breather box right now. When I removed the pcv valve (or the equivalent) I noticed that there was a seal or o-ring between it and the box. Is this stock? I don't see any reference of it in the bentley. In fact I don't see any reference to the valve itself in the book either (I looked under engine and FI). If this is normal, does anyone have a part # or a link to a replacement?

Besides the seal it looks like RTV was used on the seal and to seal the valve to the box.

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77 westy 2.0 FI
69 ghia coup 1600dp
70 single cab

[busdaddy]

Yes that's stock, one of those O ring assortments from Harbor freight should have something that fits over the snout of the valve yet still makes the valve sit up a MM or 2 before tightening up the nuts.
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[ivwshane]

[SGKent]

it is the same as the one between the booster and master. Easy to find something that fits and works. DO NOT clean the inside of the PCV valve or it will dissolve instantly. To see if it is already perforated draw a small vacuum on the small hole on top. If it holds a vacuum the valve is still good.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[aeromech]

Don’t put sealant on the oring. Maybe a dab of lube but that’s it.
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[WhirledTraveller]

I found that the bale wasn't applying very much compression to the gasket. I was able to use a vise and judicious use of pliers to carefully bend the wire in such a way as to increase the tension and that seemed to do the trick. I initially used grease on both sides of the gasket but didn't like the way it allowed everything to slide around, felt like a recipe for extruding the gasket, so I switched to Curil T and that stays in place a little more to my liking. I feel like RTV applied carefully is also appropriate in this instance, but like Ray noted you don't want to glue the breather box on. Just create a nice cushy sealing surface.
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1977 Westy, Automatic. Big Valve heads, CS Cam.

[ivwshane]

I'm at HF right now and I have 3 choices for o-ring material, nitrile, viton, and HNBR. What should I get for this application?
_________________
77 westy 2.0 FI
69 ghia coup 1600dp
70 single cab

[SGKent]

viton if they have it
_________________
“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin