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Airboat with Lycoming O-540

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  • Airboat with Lycoming O-540

    I have an airboat with a Lycoming engine it it. I have an over heating problem and no nothing about airplane power plants. And now with a messed up back I have no way to really work on it. So does any one know of or do work on Lycomings for a reasonable rate? Thanks for any help.

  • #2
    This is the boat with the problem:
    Click image for larger version

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    • #3
      As an aircraft mechanic, I can just make a couple recommendations to check. If this setup has operated correctly in the past and is now running hot, check for an exhaust restriction and check fuel flow and make sure it is not running too lean. On an air cooled airplane engine both will cause overheating.

      Hope you get it fixed.

      Steve
      "I refuse to let the things I can't do stop me from doing the things I can"

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      • #4
        What octane fuel are you running? Also I've talked to people that put a bigger oil cooler on and relocate it to a spot that gets plenty of air circulation. Just some thoughts.....I was in the same situation as you, with that same boat many moons ago (2003).......... I finally sold it. I brought it up to the Ivishak/Echooka.........thats a whole other story. The guy I sold it to said he had a friend that was a aircraft mechanic and he was going to fix it up. I took a loss on that boat big time......ssshhhhh....don't tell my wife. I hope whoever you bought it from informed you of it's history and gave you a deal!

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        • #5
          Originally posted by ratlmn View Post
          What octane fuel are you running? Also I've talked to people that put a bigger oil cooler on and relocate it to a spot that gets plenty of air circulation. Just some thoughts.....I was in the same situation as you, with that same boat many moons ago (2003).......... I finally sold it. I brought it up to the Ivishak/Echooka.........thats a whole other story. The guy I sold it to said he had a friend that was a aircraft mechanic and he was going to fix it up. I took a loss on that boat big time......ssshhhhh....don't tell my wife. I hope whoever you bought it from informed you of it's history and gave you a deal!
          Well if you are saying it was this exact same boat, then no he didn't tell me. He took me out on a short run and all seemed good. Told me he was buying a larger one (not getting rid of a problem one). I took it out and over heated 3 times before I got to my cabin. So I got towed most of the way out and only ran it up the Big-Su from the Deshka and it was hot by the time I got to the landing. So of course he never responded to my phone calls or e-mails. So if I can't get it fixed then I loose a lot of money too. Can't work due to back surgery so not a lot of money to spend on it. I know where I can get a Chevy 350/ gear box/ 6 blade but done have the ability or knowledge to swap it out.

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          • #6
            Grumpy, if you went on Southernairboat.com and sign up there (free) you can go to aircraft motor forum and they will give you loads of free help, thats a popular motor for airboats and they will help you big time, I'm sure. I'm retired and have some free time, if there is anything I can do to help, send me a pm. Bud
            Wasilla

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            • #7
              Grumpy, sorry to hear the guy wasn't upfront/honest with you. Like I said I'm no A&P mech. But research I did made me think If I had run the proper avgas through it, it would've run cooler, plus a bigger oil cooler. I honestly don't know. I got fed up and bought another then sold this one cheap to get it out of the yard. I actually sold it to the guy I bought the newer airboat from. Like I said above, he said his friend was an A&P and he was going to fix it up. So I don't know if the boat has been worked on since I owned it or not. Below is an ad from craigslist, one of those might bolt right up, if not maybe the guy has some knowledge of lycoming motors, It's worth a shot..............Jeff












              0470 GPU Continental 6 cylinder engine for airboat.
              New Rings
              Rebuilt Carburetor and Magneto
              more than one engine available. I put a new one on my boat this year and it made a huge difference!
              $2500 OBO
              Richard 243-4804


              Location: Anchorage
              it's NOT ok to contact this poster with services or other commercial interests

              PostingID: 2300615828

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              • #8
                Thanks Jeff, I think I will e-mail him and see. I don't think the prop from the Lycoming will work on Continental but he may know of someone that can work on mine or knows of another engine. Another friend of mine just messaged me telling me to look at the same ad you posted..

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                • #9
                  Not having anything to do I was wondering what would cause a air cool engine to get hot. It appears the oil cooler keeps the engine cool, check the oil pump, oil filter (stop-up) anything that would keep oil from getting to the radiator. Do a compression test and check the timing, is your radiator to small, what about location?


                  I also found some post on Southern airboats.


                  shroud, but still have it. Remember that most of those aircrafts have shrouds and ducts that cool the engine off. If some of those vents get stuck overheating is common.


                  ... cold, and then send it through the cooler when the oil gets hot. The article linked above does not say that specifically, but it suggests that an overheating problem may be caused by a leaking vernatherm allowing significant ammounts of oil to by-pass at all times. Seems to me that it would have ...


                  what da i know we run both always on been running that way for over 10 years. same with the mags both run at same time. if ideling overheating problems have been told run 1 mag more advanced like 10 degree will make engine run cooler for frogging ect. that case run both mags to start then switch to your running preferance. oh boy have i started somthing now .

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                  • #10
                    Made several phone calls today and ended up catching one of guys driving within a mile of the house so he stopped by. First thing he said is we need to get rid of the oil cooler and get a larger one along with the oil lines. Then told me the air shroud was all wrong and we need to change that. Turns out he is a friend of my brother-in-law and is willing to help me go through it and to compression checks, timing and all. Looks like it may be a couple weeks before he can get to it. So maybe I will get this thing running after all without a lot of money out of my pocket. Thanks for all your input....

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                    • #11
                      Grumpy glad to hear it! Keep me posted I'd like to see that boat when it's running right.........Jeff

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                      • #12
                        Good news Grumpy, I've been thinking that your problems may not be as major as you are believing. If you need a hand swinging some wrenches sometime, like I said I am retired and have the time, send me a pm. Happy to help. Bud
                        Wasilla

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                        • #13
                          AK Grumpy Just A Thought, Sorry Don't Know Anything About Aircraft Motor But I Have Had Problems With The Over Heating On The Car Motors In The Airboats From A Lean Fuel Mixure You Might Check That To. Skip

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                          • #14
                            I would think the "principle" would be the same as a problem I had with my truck's tranny when hauling 10,000#. The first thing I did was put a larger oil pan on the tranny. Second, I added a second oil cooler next to the first, doubling the amount of oil being cooled. Third, I went with all synthetic oil. Night and day difference for me. I have never had a Lycoming, but it seems like the concept I mention is the way you are heading. Great that someone that knows what they are doing is jumping in to help. Keep us informed how this progresses.
                            "...and then Jack chopped down the beanstock, adding murder and ecological vandalism to the theft, enticement and vandalism charges already mentioned, but he got away with it and lived happily ever after without so much as a guilty twinge about what he had done. Which proves that you can be excused just about anything if you're a hero, because no one asks the inconvenient questions." Terry Pratchett's The Hogfather

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                            • #15
                              Originally posted by akblackdawg View Post
                              Good news Grumpy, I've been thinking that your problems may not be as major as you are believing. If you need a hand swinging some wrenches sometime, like I said I am retired and have the time, send me a pm. Happy to help. Bud
                              Thanks Bud, I may just hit you up on that one. Being I can't be to much of a help right now. Looks like we will be doing most of the work in the Valley.

                              And Jeff.. if we get her running I will get with you and take her out for a spin. But looks like when it was first built the guy did some things wrong maybe. The guy that is going to help me runs nothing but Lycoming's. So I am a little more hopeful now. He said he loves the way it is set up and will show me how to adjust prop and all.

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