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Thread: Firewall Grommets and Sealing Putty; PA22 Steering Pushrod

  1. #11
    Harold Kroeker's Avatar
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    Dec 2013
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    Winnipeg, Canada
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    Default Re: Firewall Grommets and Sealing Putty; PA22 Steering Pushrod

    Home Despot has this stuff which is rated to 2000 degrees.
    http://www.homedepot.com/p/3M-10-1-o...-136/100390499

  2. #12
    cozzmo81's Avatar
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    Aug 2015
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    New Castle, IN
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    Default Re: Firewall Grommets and Sealing Putty; PA22 Steering Pushrod

    At work we use PRC DeSoto P/S 700 firewall sealant on turbine engine Pylon heat shields. It has a temperature range of -65 to 400 degrees and can withstand flash temperatures up to 2,000 degrees. GE also uses Momentive RTV 106 (Red) for the sealing of engine cowling fire seals. The RTV 106 is good for temps up to 500 degrees and intermittent temps of 600 degrees. The P/S 700 is pricey at about $100 for a 6 oz tube but its good stuff.

  3. #13
    Glen Geller's Avatar
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    Dec 2007
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    Beaverton, Oregon, United States
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    Default Re: Firewall Grommets and Sealing Putty; PA22 Steering Pushrod

    Thanks All for the suggestions for firewall sealant. I suppose fireproof-ness is not 100% relevant since the rubber grommets themselves would probably burn away regardless of the sealant.

    Any thoughts about the pushrod "floating bushings" in the firewall, ie, are there any improvements available?
    Mine seem to be kind of sticky as they translate within the clamshells as rudder pedals are depressed.
    I've smashed the bushing assemblies (cup-packing-cup) pretty flat in a vise, and confirmed the clamshell on the firewall is not distorted (unless the four mounting screws are a little too tight?)
    It's such a pain to work on anything down on the firewall...

    Thanks,
    GG
    Glen Geller
    1955 PA22-150 "One For Papa!"

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