Quote:
Originally Posted by Henry Schmidt
The problem I have with Three Bond 1200 products as a case sealant is that they are Silicone based sealants and as such produce a flexible bead on the inside of the case.
If/when that bead encounters engine vibration and/or fluid dynamics of whirling engine oil the bead breaks loose and ends up as worms in the oil supply blocking oil passages like oil squirters, cam pray bar and bearing supply holes.
The 1100 products are synthetic rubber based sealants that have less of a propensity for beading and the beads seem the resist break away better.
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For this to happen, the oil has to make its way through the oil filter or filters in the later air cooled cars. It is amazing the amount of lint, Dow 111 and sealant junk in the filter at the first and second oil change as the stuff floats free.
One has to wonder why Porsche uses the 1209 in the GT3 catalog and not Loctite as previously. They do specify a 1.5 mm bead and this provides a very small bead at the joint compression line. And the GT3 has only one oil filter which is after the scavenge pump.