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  1. #1
    Member Valkyrie's Avatar

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    Decoking engines

    Hi there,
    Was wondering if people decoke their own engines or if it has to be some kind of specialised mechanic.
    What are the steps involved?
    Valkyrie


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  2. #2
    Senior Member AndyJ's Avatar

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    Hi, its a bit different for all.
    Some like me do it themselves
    Sometimes there is someone who likes doing it at the airfield, (another pilot), who'll do a good job for a low cost.
    Some send away to service centres, eg, Ecclestones etc.

    There is no fixed rule, but if you're handy with your car maintenance and a bit of an engineer it's not difficult to do it yourself. If you have doubts ask at the time
    Raven Alpha 582
    "Flying is learning how to throw yourself at the ground and miss." - Douglas Adams

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    Valkyrie (01-09-11)

  4. #3
    Member Valkyrie's Avatar

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    Thanks for that, sending a whole engine away sounds expensive, is there a specific product you use to decoke or is it elbow grease?

    Sent from my R800i using Tapatalk
    S.L.T.S.M.A.
    (so little time, so many acronyms!)

  5. #4
    Elbow grease.

    I did my 582 quasar engine myself and found a sticking "ring"

    Glad I did it when I did.
    Happy Safe Flying
    May your Landings = Your Take Offs
    Vince Gledhill
    Site Admin
    http://www.microlightforum.com
    http://www.greeneru.co.uk to save the planet by changing to LED lights.

    Find help here with various aspects of using the forum in my blog

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    Valkyrie (01-09-11)

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    Member Valkyrie's Avatar

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    Hi vince,
    Thanks for that,
    did it take you long, and is there any requirement for a check pilot to test it afterwards?
    Valkyrie

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  8. #6
    Senior Member Polski's Avatar

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    http://www.ransclan.com/forums/showthread.php?t=821

    Have a look at this link. It was the first time I'd done a decoke and it was pretty straightforward. It increased max rpm by approx 200 and started easier.
    Cleaning out the ring grooves, I used a snapped hacksaw blade to get the clag off then a BRASS wire brush to clean it up. Dont use a steel one as its a harder metal than the piston. ALSO soak a cloth in oil (2 stroke) and cover the crancase around the con rod to stop the loose carbon dropping into the crankcase. The crud should stick to the cloth and after your cleaning up operation carefully remove the cloth and dispose of the *****.
    Ade
    G----- Tonto, get the Mogas......Hi..ho Rotax away !!!!!!

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    Valkyrie (01-09-11)

  10. #7
    Senior Member Polski's Avatar

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    and take your time, don't rush and get hold of a small torque wrench. I also found that Carb Cleaner helped shift some carbon. If the rings are sticking take great care when freeing them as they are fairly brittle, and dont forget to clean these. If you can spare the time, an overnight soaking of the rings in a solution of caustic soda will shift the carbon off the rings (even some strong oven cleaners will do the same).
    Ade
    G----- Tonto, get the Mogas......Hi..ho Rotax away !!!!!!

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    Valkyrie (01-09-11)

  12. #8
    Member Valkyrie's Avatar

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    Good man,
    Just what I was looking for,
    doesn't seem to be such a big deal then if you're reasonably handy with a torque wrench.
    Did you have some sort of instructrion manual from the manufacturer to guide you, or is one two stroke pretty much the same as another two stroke?
    Good tip with the steel brush btw, I'de imagine you could do some real damage otherwise.

    Cheers
    Valkyrie

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    Member Valkyrie's Avatar

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    I don't actually have an engine I'm going to work on,
    I was just wondering if it was viewed by the general community as something that could be done by the owners with the minimum of fuss/downtime.
    Thanks for the info
    P.s
    I take it this is not required on a 4stroke engine.

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  14. #10
    Quote Originally Posted by Valkyrie View Post
    Hi vince,
    Thanks for that,
    did it take you long, and is there any requirement for a check pilot to test it afterwards?
    Valkyrie
    No, it's not a big job. About 4 hours tops, and no, "permit to fly aircraft" (Microlights and LAA types) you can maintain yourself. Only inspection required is the annual "permit to fly"
    Happy Safe Flying
    May your Landings = Your Take Offs
    Vince Gledhill
    Site Admin
    http://www.microlightforum.com
    http://www.greeneru.co.uk to save the planet by changing to LED lights.

    Find help here with various aspects of using the forum in my blog

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