Reply To: Mid 50’s OMC head gasket sealer?

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January 16, 2020 at 11:24 am #192205
drifter
Participant

    More questions. On page 3-41 of my Seloc 1956 – 1970 Johnson/Evinrude Outboard Tune-Up and Repair Manual for 1.5hp thru 40hp, it states “NEVER use automotive type gasket sealer. The chemicals in the sealer will cause electrolyitic action and eat the aluminum faster than you can get to the bank for money to buy a new cylinder block.” So, does that rule out Permatex Aviation Form-A-Gasket and/or Permatex Indian Head Gasket shellac?
    Is that to say that one should never use these products on aluminum i.e., head bolts, exhaust cover bolts, lower housing bolts, etc.?