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Oil Pan Gasket

Discussion in 'Ford Trucks' started by johntmcdonald, Aug 26, 2015.

  1. johntmcdonald

    johntmcdonald New Member

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    Whats the best approach to making a 300 six pan gasket leak proof including the rear main seal. I have always used a silicone sealer on the main seal gap per Fords instructions (1984). I think it might help to make sure that I am using an oil and gas resistant silicone.

    JM
  2. Dominick 1

    Dominick 1 Well-Known Member Respected Member

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    The rear main seal is round can't use silicone there
    you may use it on the pan gasket
  3. pkevins

    pkevins Active Member Respected Member

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    I recently installed the 289 equivalent of this part on my Mustang:
    http://www.summitracing.com/parts/fel-os34601r/all/make/ford
    and followed their instructions, which call for no added chemicals except a small dab of silicon (I used gray) at the four corners (though I did sneak some Advanced Formula Hylomar http://www.hylomarsealant.com/_resources/_html/products.html on the bolts (don't telll anyone) when I gently torqued them into place. The plastic "studs" to help guide installation make it much easier (as does a second pair of hands). No leaks. Even my "old school" buddy/mechanic/engine builder is a believer now.
    my two cents.
    Kevin
  4. Action

    Action Moderator Staff Member Respected Member

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    I never use silicone anymore. Silicone has gassing issues when cureing that can have a negative effect on electronic engine controls. An oil pan gasket is not a problem.

    I use RTV if I need a gasket sealer. It is modified to not have an issue with sensors.

    >>>>>>>>>>>>>Action
  5. pkevins

    pkevins Active Member Respected Member

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    No argument, but this stuff claims to be sensor safe (it has in all places I've used it, not just my old Fords).
    http://www.permatex.com/products-2/...torque-rtv-silicone-gasket-maker-82194-detail
    Kevin

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