Timing Cover Gasket Adhesive
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The crankcase side of the gasket is un-pressurized, so oil leaks are virtually nonexistent. It's only the coolant journals that need attention, and this
gasket shellac (Permatex 20539) is very effective. It goes on easily, is very durable, & dissolves with alcohol (like brake cleaner) making removal quick when needed. The bolt journals should be left un-treated so that any coolant that gets in is likely to leak out before corroding the bolts (which should be painted & anti-seized).