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08-31-2014, 09:15 PM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Quote:
Originally Posted by bjohnson1234
What is the best way to test that?
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First, I would agree that you should not become a statistic, so be sure you have a solution, and don't fly to find out.
Second. For the condition of suction leakage, I am pressurizing the pieces of the fuel system as I go. I am plugging both one end with a pressure gage, adding a valve on the other, pressurizing with air to 35 psi and shutting the valve, The volume of the system is small so a leak gets a pressure drop pretty steady. My plan, as a maximum, is from the tank line, to the servo (post mechanical pump). The best leak detector is Fantastic or 409, but be sure to use it where it can be washed off as it will not play nice with aluminum. If you choose to do this, I would purge the fuel first as it will be a lot easier to detect air leakage.
Others can advise you on good ways to ensure heat is not added to the fuel lines.
BTW - Lycoming has a -2 psi limit at the inlet of the mechanical pump. I would prefer a temp and pressure, but that is all they say.
Good luck and don't be rolling the dice.
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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08-31-2014, 09:40 PM
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Join Date: Mar 2014
Location: Prescott, AZ
Posts: 739
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I fly with a guy that had the some problem, the engine quit on take off. Unfortunately the plane became a total loss when it came back down, fortunately he only got some minor injuries.. It was the servo. The IO-360 was overhauled but the servo turned out to have had it's prior service more then 20 years ago. We sent it to Airflow Performance were every single part in it was AD'ed or rotten. They work great when cared for but will fail if neglected, they can kill you. Get it checked!!!!
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09-01-2014, 09:44 AM
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Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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Ok, I have a little more information after uploading my engine data. Fuel pressure was stable at the time the engine quit. All previous flights including the one post-maintenance showed stable fuel pressure with and without the electric pump. Fuel pressure was also stable on my test flight and any power loss appears to be my overactive imagination as the data shows that everything was stable. After landing and turning off the electric pump the fuel pressure was very erratic.
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09-01-2014, 09:59 AM
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Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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Also, servo is precision model RSA-5AD1/2576535-A Serial #70242209
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09-01-2014, 10:37 AM
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Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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This morning I used throttle body cleaner to make sure no gunk was left inside the servo from my previous cleaning and also checked the filter inside the servo. On the ground I was unable to replicate either the fuel pressure drop, the hesitation on throttle change or the engine quitting when going to idle from full throttle on either tank. OAT yesterday was about 41C and this morning it's 35C. My post-maintenance flight a week ago when everything checked out OK was also about 41C.
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09-01-2014, 11:00 AM
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Join Date: Aug 2010
Location: Titusville, FL
Posts: 46
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Engine Issues After Washing
I had a similar issue after washing my O360. Found that the air box had a significant amount of water that had accumulated even though I was careful not to spray directly into the intake. On takeoff roll the engine stumbled and I aborted. Taxied back to hanger, pulled the cowl off and noticed small drip at back of airbox. Drilled a 1/8 hole at the lowest point and outside of the filter area and half a cup of water drained out. After allowing the drip to stop I ran it up on the ground and no issues. Take off and flight around the pattern was uneventful Now when I wash the plane I stuff a bright orange foam Nurff ball into the intake.
Hope you find the problem.
__________________
Brian Shol
RV6A, 0-360, CS Prop
Garmin 696, iPad on Panel, Dynon D10A EFIS/D10 EMS/D6 EFIS
Dynon EIS, IFR Cert
Yes: I paid my =VAF= membership dues for 2015
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09-01-2014, 11:16 AM
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Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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Quote:
Originally Posted by X21RV6A
I had a similar issue after washing my O360. Found that the air box had a significant amount of water that had accumulated even though I was careful not to spray directly into the intake. On takeoff roll the engine stumbled and I aborted. Taxied back to hanger, pulled the cowl off and noticed small drip at back of airbox. Drilled a 1/8 hole at the lowest point and outside of the filter area and half a cup of water drained out. After allowing the drip to stop I ran it up on the ground and no issues. Take off and flight around the pattern was uneventful Now when I wash the plane I stuff a bright orange foam Nurff ball into the intake.
Hope you find the problem.
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This was my first flight after just washing the plane and there was liquid and "gunk" in the air box when I took it off. I'm not sure if it was water and/or fuel. I also drilled a hole in the bottom to make sure no more liquid accumulated. Sucking up water on full throttle would certainly explain the engine quitting and I'm unable to replicate any issue at all after cleaning the throttle body a second time. I'm still concerned about the low fuel pressure, but so far unable to replicate that either.
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09-01-2014, 11:40 AM
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Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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I've had a ongoing issue with fuel boiling at idle on hot days causing "hiccups" at idle. I wonder if the fuel pressure drop could have been from running it up repeatedly on the ground on a very hot day trying to diagnose the engine failure? I had my plane out at Don's shop about a year ago to look at that issue and he made a few small tweaks to make it better.
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09-01-2014, 02:58 PM
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Join Date: Apr 2010
Location: California
Posts: 98
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Carb cleaner
What do you think carb cleaner would in a fuel injection servo. If fuel is the lubricant then carb cleaner may break down the seals as it is a drying agent. For what it's worth
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09-01-2014, 03:08 PM
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Join Date: Oct 2012
Location: Scottsdale, AZ
Posts: 150
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As it turns out carb cleaner is not ideal, but also probably not harmful in most circumstances from my research. It is designed to clean off a different mix of contaminants and it is designed to dry more quickly, but most of the ingredients are the same. There are some auto throttle bodies that can be damaged by carb cleaner because they have a special coating, but apparently that is pretty rare. When I cleaned it the second time I used throttle body cleaner that is designed for fuel injected engines.
Quote:
Originally Posted by denbobp
What do you think carb cleaner would in a fuel injection servo. If fuel is the lubricant then carb cleaner may break down the seals as it is a drying agent. For what it's worth
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