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Sealing a vented oil fill cap

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Nunyas

Nunyas

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So, how's it done? I recall seeing someone on these forums has an alloy valve cover with a chromed oil filler cap. I also recall the owner mentioning the cap was vented when they got it and sealed it on their own. Unfortunately, I don't recall the exact details that they went through to seal the cap. I remember something about a screw and a rubber washer, but I don't remember if anything else needs to be done to seal it. Ideas? Details? Anyone?
 
Hi Rob, All the oil filler caps I have encountered are vented either with a visible hole or more elaborate under side mechanisms. Consequently, I am curious as to why you want to close the vent. There is a very good chance that closing the vent will increase crankcase pressure and cause engine seals to constantly leak.---Keoke- /bcforum/images/%%GRAEMLIN_URL%%/confused.gif
 
Reason for my wanting to do so are for Emissions. I'll be ventilating my alloy valve cover with a line to the charcoal canister like the stock valve cover, but to pass emissions I need to have a sealed cap (along with the redirected vent).
 
Gotcha, It would seem that a very small sheet metal screw [Available at Hobby Shops] saturated with clear RTV and then screwed in place should do the job. Excess material can be removd after the RTV sets up.---Keoke
 
very well! thanks!
 
I sealed mine with a dab of JB Weld on the inside. I was afraid a screw might somehow come loose...
 
I also used JB Weld and then stuck a MG logo hat pin on top- looks good!
 
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