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Oil in pulse line, 582 Blue Head

in 2 Stroke Technical Questions 13 years ago

  • Re: Oil in pulse line, 582 Blue Head

    by » 13 years ago

    Hey Doug
    I need to know what the EGT's are.How hot are they and at what throttle setting are they the hottest.Not ready to confirm crank seals.If the inner crank seals are bad,the first sign is the oil in the RV bottle will be going down and one EGT will be "cold".You can have a rich mixture and see oil in the pulse line..Please let me know..

    Shayne
      
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  • Re: Oil in pulse line, 582 Blue Head

    by » 13 years ago

    Doug,

    Before you go into the block, you might check the rotary valve shaft seals. If you have any indication of oil in the radiator, you could have a bad seal on the water pump side. Look in the radiator and check for an oily sheen on the coolant. The other seal is on the rotary valve end of the shaft. If its the rotary valve side thats leaking, the oil is sucked into the crankcase along with the fuel/air mix and is not a problem if the leak is small. You just have to keep an eye on the oil reservoir level. All of these seals can be replaced without tearing the engine apart. I have changed them without removing the engine from the plane. If it is the waterside seal, another indication can be oil that looks like chocolate mousse in the rotary shaft reservoir. You can check this by draining the oil at the drain plug. If you look carefully directly under the water pump, there is a weep hole in the seam where the upper and lower halves of the crankcase are joined. If you see any indication oil or water running down the side of the block in this area, one of the seals on that end is leaking.

    Good luck!

    Bill.
      
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  • Re: Oil in pulse line, 582 Blue Head

    by » 13 years ago

    Doug,

    One other problem I have seen which is rare, but does happen is with a water pump bolt. The Bolt in question is the lower left side bolt as you are looking at the pump. I have seen two incidences where the bolt hole, when drilled and threaded, left a small pinhole opening into the block cavities which could cause oil leaks. Easy fix is remove the bolt, coat with thread sealant and reinstall.

    If your EGTs are as close as you say, the oil loss is not getting worse, and you don't have any oil and water mixtures anywhere, I'd go flying. Seals rarely fail suddenly, almost always slowly wear out.

    Bill.
      
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  • Re: Oil in pulse line, 582 Blue Head

    by » 13 years ago

    Hi Shayne
    Here is the info you are looking for:
    I flew for 1.5 hours at 4850 rpm, nice slow climb to 2400 feet.
    EGT"s were 995 degrees plus or minus 15 degrees and between the Mag and PTO, as I said before there was no more tham 10 degree difference.
    The CHT was between 162 to 169 degrees.
    Full throttle the EGT's were 1150 +/- 20 degrees ,CHT 165 degrees.
    At 3200 rpm on descent, EGT's were 1050 degrees, CHT 165 degrees.
    I do have the needle set at lowest setting because in the middle setting my EGT's were 1150 degrees +/-
    20 degrees and more important the CHT was going over 180 degrees when I was at cruise rpm 4800. Also the rpm's drifted up and down, the old mid range problem we all know about so I thought I had the carbs at a good place.
    OK, is that everythng you were looking for? Let me know if you need more.
    Thanks again!

    Hey Bill
    I will look closely at the oil res. but I have looked in there while putting in more oil and I did not see anything out of the ordinary. I did peak at the coolant the other day and did not notice any oil in it, but I will look again and submit another update. I will also look at the water pump.
    I am inclined to keep flying but I have more uncertainty about the engine, more than the usual that is!
    Also, there is not an over abudance of smoke when I start the engine like there was last year when this saga started. At least something was fixed when the new crank was installed.
    I'll checck back tommorow.
    Thanks to you also!

    Doug
      
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  • Re: Oil in pulse line, 582 Blue Head

    by » 13 years ago

    Hi Bill
    I checked the oil res. and it looks fine, just oil.
    I looked at the coolant and saw no oil film.
    Water pump has no oil spots that I can see.
    Thanks for your help.
    Doug
      
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