---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sun 10/25/09: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:54 AM - Re: Oil in exhaust, Rotax 914 (Frans Veldman) 2. 10:25 AM - fluting ands reading glasses (Fergus Kyle) 3. 01:47 PM - Re: Oil in exhaust, Rotax 914 (jason Parker) 4. 02:26 PM - Re: Oil in exhaust, Rotax 914 (Frans Veldman) ________________________________ Message 1 _____________________________________ Time: 02:54:55 AM PST US From: Frans Veldman Subject: Re: Europa-List: Oil in exhaust, Rotax 914 jason Parker wrote: > If the ball in your check valve doesn't make a good seal, it will > fill up the turbo oil drain box due to gravity feed. When you go to > start it, you will bleed oil past the turbo seal until the oil coming I have reasons to believe that the oil was already past the seal before I started the engine. In the months that the engine didn't run, oil has seeped past the seal. Before the engine produced any significant heat, the oil was already blown out the exhaust. While I agree that a constant flow of oil in a very heat environment will coke up the wastegate, I don't think that oil that is quickly thrown out of a cold engine once in a few months will cause wastegate problems. In fact, the wastegate on my 914 feels still normal. > If your burning > oil all the time then it is one of the following, your turbo needs to > be rebuilt, your oil check valve is not poping at 65 psi and over > supplying the turbo, or your secondary scavange pump isn't working > properly. I agree with that. I will thus carefully check that the engine is not burning oil all the time. At the moment I can't start the engine because I drained the tank (the prime reason I started the engine was that this was the easiest way to get rid of the small amount of fuel that was left ;-) ). Next time (won't take months!) I will carefully monitor whether oil is thrown out again. Thanks for your comments, Frans ________________________________ Message 2 _____________________________________ Time: 10:25:26 AM PST US From: "Fergus Kyle" Subject: Europa-List: fluting ands reading glasses "BTW I have been told that some airline pilots are using multifocals with two reading portions: the low one as usual and another one at the top of the lense for seeing the overhead panel! " Remi: When needing to overcome the ravages of time, I opted for Quadrifocal glasses - Bifocal as normal, with the distance range about 70 % down from the top and the bottom focused on 36 inches (instruments) - and a small sector at the top for the 12" overhead panel, and another small sector on bottom for lap reading charts etc. They looked weird but did the job. All of this was for the amazing Lockheed L-1011 TriStar. "The distance portion of the lens is therefore reduced, but do they often need to see outside?" Are you serious? At 480 knots, you have to watch out even in cloud - perhaps even more intently than at 80 knots? In most airliners ('cept the 747) the pilots usually die before their clients, unlike lawyers and doctors.. Ferg #A064 Mono 914 CSprop ________________________________ Message 3 _____________________________________ Time: 01:47:48 PM PST US From: jason Parker Subject: Re: Europa-List: Oil in exhaust, Rotax 914 I had a guy with a 30 hour engine blow his engine with the same reasoning. Yes, once you will up the oil drain box, it will seep past the seals. Turbo s can't take any back pressure at all or they will leak. You can do the sam e thing with a new turbo. It is your check valve. replace the ball and the banjo bolt and you will be good. Jason --- On Sun, 10/25/09, Frans Veldman wrote: From: Frans Veldman Subject: Re: Europa-List: Oil in exhaust, Rotax 914 jason Parker wrote: > If the ball in your check valve doesn't make a good seal, it will > fill up the turbo oil drain box due to gravity feed. When you go to > start it, you will bleed oil past the turbo seal until the oil coming I have reasons to believe that the oil was already past the seal before I started the engine. In the months that the engine didn't run, oil has seeped past the seal. Before the engine produced any significant heat, the oil was already blown out the exhaust. While I agree that a constant flow of oil in a very heat environment will coke up the wastegate, I don't think that oil that is quickly thrown out of a cold engine once in a few months will cause wastegate problems. In fact, the wastegate on my 914 feels still normal. > If your burning > oil all the time then it is one of the following, your turbo needs to > be rebuilt, your oil check valve is not poping at 65 psi and over > supplying the turbo, or your secondary scavange pump isn't working > properly. I agree with that. I will thus carefully check that the engine is not burning oil all the time. At the moment I can't start the engine because I drained the tank (the prime reason I started the engine was that this was the easiest way to get rid of the small amount of fuel that was left ;-) ). Next time (won't take months!) I will carefully monitor whether oil is thrown out again. Thanks for your comments, Frans le, List Admin. =0A=0A=0A ________________________________ Message 4 _____________________________________ Time: 02:26:08 PM PST US From: Frans Veldman Subject: Re: Europa-List: Oil in exhaust, Rotax 914 jason Parker wrote: > I had a guy with a 30 hour engine blow his engine with the same > reasoning. Yes, once you will up the oil drain box, it will seep past > the seals. Turbos can't take any back pressure at all or they will > leak. You can do the same thing with a new turbo. It is your check > valve. replace the ball and the banjo bolt and you will be good. Ok, I will replace these, shouldn't cost me a fortune. Thanks! 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