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Thread: tach seal

  1. #1

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    tach seal

    Does anyone have any tricks to replacing the lycoming tach seal? I need to do one and I see that spruce carries a tool but I am unsure of how well it will work. Tim

  2. #2

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    Haven't done one for a while but shouldn't be too difficult. Not sure what the tool is to remove them insitu. Use a couple of picks to pry the old seal out. Dont damage the housing. Lube the shaft then tap the new seal in gently using a socket or sleeve etc.
    Should work a treat.
    Likes boarfish liked this post

  3. #3

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    I’ve used a close quarters right angle drill with a short number 40 drill bit..drilled two holes into the seal, screwed in a couple number 6 sheet metal screws then slipped a short tiny torx head bit into the end of the tack drive shaft to pry against using 1/4” key stock as the lever.


    Sent from my iPad using Tapatalk Pro

  4. #4
    www.SkupTech.com mike mcs repair's Avatar
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    buy a tach drive cover w/seal.... and put in an electronic tach?

    https://www.aircraftspruce.com/catal...es/tachcap.php

  5. #5

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    Quote Originally Posted by mike mcs repair View Post
    buy a tach drive cover w/seal.... and put in an electronic tach?

    https://www.aircraftspruce.com/catal...es/tachcap.php
    I wish but the owner wants to keep his original tach...

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