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rocker gasket

Roblatt

High Miler
Joined
Nov 18, 2008
Messages
603
Location
Nar Nar Goon, Victoria, Australia
Folks,

I have an '06 B11, and the left side rocker gasket keeps blowing. The right side is still the original at 150,000kms (not bad me thinks), but the left only lasts 2-3000kms before it starts to leak. It perishes at the bottom end just above where the spark plug is. Always the same place. I've looked at the surfaces and can see no imperfections.

The guy at the local auto store suggested I replace the gasket with silicon beading but my fear is trying to get it off each time I want to check the clearances.

Do it or not? Doesn't make as difference? Try it it won't do any damage? What are your thoughts.

thank you

Robert
 
Also check the valve cover. If you don't have a machinist table, place a sheet of 400 wet/dry sand paper on a sheet of glass. Place the valve cover on the paper and move it around a little. If you see a spot that doesn't make contact, there is your answer. Also Steve's recommendation for the older style gaskets is spot on.
 
The time honored and respected professional solution but remember less is more! Read directions and follow exactly. Works perfect every time. Remains pliable, never gets hard.

Hylomar
 
At the moment the top half is original gasket, the bottom half is a silicon gasket replacement stuff for high temperature areas. I did this prior to my opening post because I was touring when it blew. We'll see how long this lasts. Then either it will fail, or it will be service time and I'll perform the checks.

again, thanks for all the advice.

Robert
 
The time honored and respected professional solution but remember less is more! Read directions and follow exactly. Works perfect every time. Remains pliable, never gets hard.

View attachment 18665
Curiosity compels me to ask what the physical characteristics of this sealant are? Is it similar to RTV or more like an anerobic sealant similar to loctite 518? They both have their place. I personally prefer to use the anerobic sealant. It only hardens when you squish it, any excess washes away in the oil and won't clog anything unlike blobs of RTV.
 
Hylomar comes from turbine aircraft engine mechanics. It was specifically developed so that a turbine engine could be disassembled and then reassembled without the need to replace gaskets. Very handy in remote parts of the world I imagine.

As far as I know, the exact formulation is a proprietary secret however there are technical specification documents about it at this web address.

hylomar.com/en/universal-blue/
 
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Hylomar comes from turbine aircraft engine mechanics. It was specifically developed so that a turbine engine could be disassembled and then reassembled without the need to replace gaskets. Very handy in remote parts of the world I imagine.

As far as I know, the exact formulation is a proprietary secret however there are technical specification documents about it at this web address.

hylomar.com/en/universal-blue/
Chiming in to note a similar product that was available to me locally, there is the Permatex Permashield Fuel Resistant Gasket Dressing and Flange Sealant, US Part Number 85420, Canada Part Number 85420. Permatex claims it is comparable to the Hylomar Universal Blue. It can be found at NAPA auto parts stores (NAPA Part # PTX 7651990) at $10 for a 2 ounce tube. For use as a gasket dressing a Permatex rep told me that it never hardens and there is no need to reapply it when re-using or replacing "rubber" gaskets. It can be removed with a solvent such as brake cleaning fluid (but keep your brake fluid away from paint, you know that). I was told to apply a thin film to the clean flange surfaces and then let it evaporate 2-4 minutes before placing the gasket and torqueing the bolts, then re-torque after 10 minutes. BTW, the Permatex rep was really helpful in answering questions.
 
Thank you, its always good to have options. sometimes the right sealant can make all the difference in the world and i love learning about those options so i can apply them to my professional world also. I like and use many Permatex products.
 
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