Owner Spark Plug Replacement

Discussion in 'Maintenance Bay' started by Omalley1537, Mar 9, 2016.

  1. Omalley1537

    Omalley1537 Cleared for Takeoff

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    Hello all,
    likely a dumb question, but I'm new, so...
    I have reviewed FAR part 43 regarding preventative maintainance allowed by owner/pilot. Specifically it indicates that removal/cleaning/replacement is allowed with the normal owner/pilot requirements of other preventative stuff. However, I was wondering if "replacement" means replacing the plugs that were removed, or does it include replacing with new? I would have assumed the latter but some searching led me to a forum in which at least one person said that removal/cleaning/gapping/reinstallation were allowed, but actually replacing the existing plugs with new was not.

    Again, amateur league question but I was looking at doing this on my 182 and don't want to run afoul of the regs (afoul...plugs..see what I did there...).

    Thanks!
     
  2. GlennAB1

    GlennAB1 Ejection Handle Pulled

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    I have never seen a aircraft maintenance manual differentiate between reinstallation and replacement. They all have only referenced: Removal and installation, which covers both, replacing and reinstalling.
     
  3. Tom-D

    Tom-D Taxi to Parking

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    Your good either way. the rules do not distinguish between the two.
     
  4. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

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    Replacing the owners spark plug should only be done by a properly certificated MD.
     
  5. Norman

    Norman En-Route Gone West

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    That person had his head where the sun don't shine.
     
  6. bnt83

    bnt83 Final Approach

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    Might not be the latest revision. Hope you are aware of these.

    http://www.lycoming.com/Portals/0/t...I 1042Z (05-08-2009)/Approved Spark Plugs.pdf



    http://www.csobeech.com/files/TCM-SparkPlugRotation-SIL03-2B.pdf
     
  7. Timbeck2

    Timbeck2 Final Approach

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    Yep, you can remove them, clean them, and replace them but not with new plugs. The new plugs are already clean so you can't replace them. Plus you didn't remove the new plugs therefore you can't replace with new plugs because they weren't there to begin with. (insert serious looking smiley here)
     
  8. Norman

    Norman En-Route Gone West

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    And the meaning is "is" is??????????????
     
  9. unsafervguy

    unsafervguy Pattern Altitude

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    I did not have wrench with that airplane........................
     
  10. Omalley1537

    Omalley1537 Cleared for Takeoff

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    Thanks everyone. I was thinking that replacement was ok but I've also learned that common sense and regulations don't always correlate.

    Yes, I even appreciate the smart-a-- answers, part of being a new guy. Plus, if you can't laugh at yourself, you need to lighten up.
     
  11. GRG55

    GRG55 Final Approach

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    Lycoming has a Feb, 2015 Service Instruction 1042AA out that supercedes 1042Z:

    http://www.lycoming.com/Portals/0/techpublications\serviceinstructions\SI1042AA_2_17_15.pdf

    One thing I noted when I read it last year is the emphasis in item 3 of the Spark Plug Installation Guidelines on pg 2. On questioning, Lycoming told me the Cu-based anti-seize they use at their factory is Loctite C5-A.
     
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  12. frfly172

    frfly172 Touchdown! Greaser!

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    And how does one know if you replaced with new?
     
  13. Omalley1537

    Omalley1537 Cleared for Takeoff

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    Valid thought, except that in my case the engine has Champion plugs and they will be replaced with Tempest.
     
  14. weirdjim

    weirdjim Ejection Handle Pulled

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    ... and I did not have text with that server ...

    JIm
     
  15. retpd2001

    retpd2001 Line Up and Wait

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    From the Lycoming Service bulletin: Spark Plug Installation Guidelines
    1. Spark plug gap must be set at 0.016 to 0.022 in. (0.40 to 0.60 mm).
    2. Always install a spark plug with a new gasket (P/N STD-295).
    3. Use a copper-based anti-seize compound or engine oil on spark plug threads starting two full threads from the electrode, but DO NOT use a graphite-based compound.

    Going to go crazy with spark plug info, just attended an IA seminar, Lycoming says in part the above, use copper based anti-seize or oil. I use Tempest plugs and Tempest brand graphite based anti-seize. Talked to the Tempest rep, he says Lycoming is wrong with recommending copper based anti-seize or oil, said they have been trying to correct the Lycoming reps on this (he said oil is about the worst thing you can use). So who knows who is right, personally, I will continue to use the Tempest brand anti-seize with my Tempest plugs.
     
  16. wsuffa

    wsuffa Touchdown! Greaser!

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    The Champion anti-seize is also graphited. Wonder what data Lyc has to recommend against it.
     
  17. Stewartb

    Stewartb Final Approach

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    To the OP... Did your mechanic indicate that your plugs were needing to be replaced? If you're just looking for ways to spend money on a new-to-you plane there are probably better items to replace.
     
  18. GRG55

    GRG55 Final Approach

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    I used to use Champion or Tempest anti-seize. I checked with all the shops around to find out what they were doing and most were either unaware of the new SI or didn't know a Cu-based product to replace the graphite stuff we have used "forever". That is why I contacted Lycoming to find out what they were using to comply with their own instruction. Loctite C5-A isn't difficult to find.
     
  19. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    Decades of graphite, lookit all those crashes and destroyed engines. Just gotta wonder, what is being fixed?
     
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  20. GRG55

    GRG55 Final Approach

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    Champion makes an inexpensive gauge (PN CT-482) for massive plugs to measure if they need to be replaced. I don't run fine-wire so not sure if there is a gauge available for those as well.

    Champion's Service Manual AV6-R is worth a look through as well:
    http://www.championaerospace.com/wp-content/uploads/2015/06/AV6-R-Aug20141.pdf
     
    Last edited: Mar 27, 2016
  21. GRG55

    GRG55 Final Approach

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    Agree. But $15 bought me a one pound can that can be handed down through 3 or 4 generations of spark plug changers (provided Lycoming doesn't change their mind again). It just wasn't enough of an issue for me to spend any more time on it. The stuff (Loctite) is stiffer than the Champion or Tempest compounds, and I find it a bit easier to use.

    Interesting to note that Loctite C5-A contains some graphite. :eek:
     
  22. weirdjim

    weirdjim Ejection Handle Pulled

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    Oil? OIL??? Somebody recommends OIL? Oil cokes at that temperature and will sell more helicoils (or replacement cylinders) than you can imagine.

    Jim
     
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  23. GRG55

    GRG55 Final Approach

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    Maybe that's their objective :mad:
     
  24. retpd2001

    retpd2001 Line Up and Wait

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    Not "somebody recommends", Lycoming!
     
  25. thomasdr72

    thomasdr72 Pre-takeoff checklist

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    Always with a new gasket, lol. Or just anneal your current copper gaskets as per common method and practice if you are reinstalling a used plug. Make sure you check the resistors with your ohm meter. IMHO, the resistance check catches more faulty plugs (at least legacy champion ones) than any other diagnostic (bomb tester included).

    V/r,
     
  26. Dr. O

    Dr. O Pattern Altitude

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    Always service your plugs yourself - and anything else you are inclined to learn 'how'.
    No one cares more than you do.
     
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