Quote:
Originally Posted by 911 tweaks
someone please save me re readung 16 pgs here...I do not see a listing of what to use on the oil return tubes o-rings...my guess is to treat the o-ring material as it is = use dow corning 111 as used on case thru bolts o-rings...? is this correct...?
Also, any suggestions on what to use on valve cover gaskets to prevent them from leaking...? i realize many a valve cover is leaking due to it either being loose, or over torqued and/or the valve cover mating surface to the gasket is not flat...putting all of that aside, any insight into what may help the gasket NOT leak...? (I use the silicone bead lower gaskets which help but interested in what may be used = a goop, to add the the gasket to help prevent/minimize leaks)...
thx all & thx wayne for keeping this thread open...)) bob
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The best product we (old dogs) have found so far for oil return tubes and joint ring o-rings is Dow 55 o-ring lubricant but Dow 111 should be a reasonable substitute..
It has special properties that enhance crush resistance and after installation and heat, swells the o-ring to enhance sealing. Petroleum products tend to create a issue called wicking that actually helps oil bypass the seal.
Valve covers are a different issue altogether. Flat sealing surfaces are key. Even turbo valve covers will get warped over time. Wrightwood racing offers a green lower cover that is treated with a sealant (unknown) that really works with problematic lower valve covers. One caveat: the glue that helps them seal makes removing the cover a tedious endeavor. For fresh rebuilds where a valve adjustment will be needed soon, I use the Wrightwood Racing lower valve cover gaskets with a silicon bead.