All,

For what it is worth, I had a slow oil leak between the oil pan or the block and the mounting plate the first time I assembled it in spite of cleaning the surfaces well.  The second time I put things together, after cleaning all the mating surfaces several times with brake cleaner, I embedded a light cotton string in the Ultra-Grey on both sides of the mounting plate.  This allowed me to tighten the oil pan bolts without squeezing out all the sealant from the joint.  This would be somewhat similar to the use of a silk thread between the case halves on a conventional  aircraft engine.  I realize that this is a limited data set (one instance) but at least I don’t have oil leaks in this area so far.

Steve Boese

RV6A, 13B NA, EC2, RD1A