Join Date: Jul 2006
Location: Northfield, Illinois
Here is the story guys: Late factory installation tool had a dimple in the punch center. The idea was that dry or coated with a sealant, the seal with the tiny hole through it would RELEASE TRAPPED AIR. Solid ones often did not seat completely. This was the "upgrade" to simplify installation.
Over the years, these were made of material varying in hardness, outside diameter, and hole through them or not. Preferred are those with the hole. Current thought is to install them after they sit in the freezer overnight. The main/block hole is LIGHTLY coated inside with Permetex Ultra Grey, and the factory tool (or a made up version) used to install. If you did it right, the Ultra Grey will be forced into the crack between main and block, and very little Ultra Grey will be squeezed back up through the hole. The seal WILL be proud of the surface, and final compression is completed with the sump gasket.
Here's a note. At AUSCA years ago, we installed solid ones using the same method, but used GASGACINCH, a rubber cement like sealant on both the hole and seal. (It made a mess, but worked) the Gasgacinch lubricated the seal and hole to ease installation. Gasgacinch was originally developed in, I believe, the late 1930's for assembly of gasket-less Offenhauser engines. It's an oldie, still available.
(From your source of useless Alfa information :-) )
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