Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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 Posted: Thu Sep 21, 2006 6:04 pm Post subject: Manifold drain question..... |
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OK folks...another puzzling mystery. Found the following on the
following site.....
http://www.fwshome.com/baroneduc.html
___________________________________________
Several of the intake manifold drain line checkvalve balls
were missing from their seats on each engine. These are
sucked closed by the vacuum within the intake runners as
the engines are operating (remember that 15 " showing as
manifold pressure is really a partial vacuum to the extent of
the difference between the 15" on the gauge and the ambient
pressure at the aircraft's altitude). When we replaced the
checkvalves, the right engine went smooth as butter, but the
left remained rough.
__________________________________________
When I was replacing the intake drains in my rebuilt
IO520K (scavenged from the old engine) they were just AN
fittings with either hose runs to the firewall/nosewell or just
a short length of AL tube. Are we supposed to have check
balls in the drain valves? Keep in mind the above quote was
from a Baron running IO470s, no turbos.
We recently had a discussion about something related to the
induction system on a Bellanca list but I was convinced then
that my setup was normal...now I'm not so sure. A lot can
happen to an airplane over the years. I'll also ask Bellanca
and TCM in the morning....
Thanks.
Jim Baker
580.788.2779
Elmore City, OK
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