Today's Message Index:
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1. 11:34 AM - I have a case of the sniffles but Kleenex won't help. (Dennis Polito)
2. 02:27 PM - Re: I have a case of the sniffles but Kleenex won't (Stephen Crow)
Message 1
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| Subject: | I have a case of the sniffles but Kleenex won't help. |
--> Commander-List message posted by: "Dennis Polito" <cloudhopper@attbi.com>
Greetings fellow Commanderites
Who among you can provide me relief with a serious case of the sniffles?
The relief that I am seeking involves a measurement with a ruler the dimension
between two 1/8"npt pipe plugs that are located under the engine nacelle on a
Commander 500B or Shrike. Any IO-540xxxx powered airplane will suffice. Or better
yet, if you have an IO-540 engine lying around on your living room floor (only
applies if you live in the south) with it's belly facing skyward then the
measurement will be readily apparent. I need the dimension laterally between
the plugs. Please advise if the holes are equidistant from the front of the engine
sump using the front sump edge as a reference.
According to the Lycoming manual, each IO-540xxxx is supposed to be equipped with
two each one way valves P/N 75444 that are affixed to the bottom of each engine.
The 1/8" pipe hole is actually drilled into the induction system. The "fitting"
as Lycoming describes it provides a drain for accumulated fuel to drain
out following engine shut down. This "fitting" is actually a one way valve.
When the engine is started the valve responds to low vacuum pressure and closes
off a small orifice thus preventing a leak in the induction system. When the
engine is shut down in the absence of the vacuum, the valve opens up and allows
accumulated fuel to drain. This valve is commonly known as a "sniffle" valve.
If you look at the engine installation from the nose of the aircraft you will see
that the engines are slightly tilted towards the inboard side.
On my airplane the access holes for the sniffle valves were cut out at the "uphill"
or outboard side of the engine nacelle. Since this area is very tight and
the sun doesn't shine much in this area, drilling a second inboard hole in the
lower nacelle is going to be tricky without some idea of where to place the
drill bit. I don't want to drill 18 holes to discover the right spot.
If anyone can provide me with the center to center dimensions I will see that you
receive a case of Kleenex. Please specify if you prefer scented or unscented.
Now I will bet that the majority of the Commanders out there will have none, or
one valve installed.
Let's do a survey to determine how the fleet is so equipped.
Thanks
Dennis Polito
Message 2
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| Subject: | Re: I have a case of the sniffles but Kleenex won't |
help.
--> Commander-List message posted by: Stephen Crow <k4cpx@arrl.net>
I once packed an intake so full of snow while on a long hold at very reduced power,
that the engine quit. (GO-480) After I got on the ground (a below minimums
single-engine apc) in warmer temps, water ran out of that drain onto the taxiway.
Maybe a quart or more. Then the engine was restarted with little difficulty.
My advice, use alternate air in heavy snow, even if the wings remain clear.
And check the operation of the drains periodically. Oh, yeah, and never admit
anything to the FAA. Steve C.
Subject: Commander-List: I have a case of the sniffles but Kleenex won't help.
--> Commander-List message posted by: "Dennis Polito" <cloudhopper@attbi.com>
Greetings fellow Commanderites
Who among you can provide me relief with a serious case of the sniffles?
The relief that I am seeking involves a measurement with a ruler the dimension
between two 1/8"npt pipe plugs that are located under the engine nacelle on
a Commander 500B or Shrike. Any IO-540xxxx powered airplane will suffice. Or better
yet, if you have an IO-540 engine lying around on your living room floor
(only applies if you live in the south) with it's belly facing skyward then the
measurement will be readily apparent. I need the dimension laterally between
the plugs. Please advise if the holes are equidistant from the front of the
engine sump using the front sump edge as a reference.
According to the Lycoming manual, each IO-540xxxx is supposed to be equipped
with two each one way valves P/N 75444 that are affixed to the bottom of each
engine. The 1/8" pipe hole is actually drilled into the induction system. The
"fitting" as Lycoming describes it provides a drain for accumulated fuel to drain
out following engine shut down. This "fitting" is actually a one way valve.
When the engine is started the valve responds to low vacuum pressure and closes
off a small orifice thus preventing a leak in the induction system. When the
engine is shut down in the absence of the vacuum, the valve opens up and allows
accumulated fuel to drain. This valve is commonly known as a "sniffle" valve.
If you look at the engine installation from the nose of the aircraft you will
see that the engines are slightly tilted towards the inboard side.
On my airplane the access holes for the sniffle valves were cut out at the "uphill"
or outboard side of the engine nacelle. Since this area is very tight and
the sun doesn't shine much in this area, drilling a second inboard hole in
the lower nacelle is going to be tricky without some idea of where to place the
drill bit. I don't want to drill 18 holes to discover the right spot.
If anyone can provide me with the center to center dimensions I will see that
you receive a case of Kleenex. Please specify if you prefer scented or unscented.
Now I will bet that the majority of the Commanders out there will have none,
or one valve installed.
Let's do a survey to determine how the fleet is so equipped.
Thanks
Dennis Polito
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