Today's Message Index:
----------------------
1. 08:10 AM - Re: Engine Cough? (Matthew J. Hawkins)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
JB-
Looks like you might have nailed it on this one! We found the carb heat li
nkage maladjusted - we'll let you know if that solves the problem.
Many thanks!
Matt
-----Original Message-----
From: owner-commander-list-server@matronics.com [mailto:owner-commander-lis
t-server@matronics.com] On Behalf Of yourtcfg@aol.com
Sent: Tuesday, July 10, 2007 1:02 PM
Subject: Re: Commander-List: Engine Cough?
After checking the other suggestions, It is probably an adjustment to the
pressure carb. Try this. While it is acting jacking up, manually lean the
carb and see if it clears up. If it does, it is rich, if not, most likely
lean. There are two adjustment on the carb. One for idle mix, the other
for "off idle" It is probably the off -idle but both will need touched up.
If you have a manual for the engine it will cover this procedure, if not
let me know and I can walk you through it. One last thing, make certain th
e carb heat is not on. Sometimes the linkage will allow the carb to pull i
n hot air and with the temps rising it could just now be showing up. If th
e engine has had a backfiring incident recently, if could have bent the lit
tle carb heat butterfly doors in the carb heat box. I have seen several of
these over the years and they too will let hot air into the carbs causing
them to stumble . Conversely, an exhaust leak in the cowling can overheat
the ambient air in there and trick the carb into thinking it is really hot
outside and it will try to compensate by leaning. jb 360-903-6901
pressure carburetors
-----Original Message-----
From: Matthew J. Hawkins <hawkins@cms.udel.edu>
Sent: Mon, 9 Jul 2007 9:07 am
Subject: Commander-List: Engine Cough?
l.edu<mailto:hawkins@cms.udel.edu>>
All-
We're having a minor intermittent problem on the left engine of N2760B. Th
ey
are Lycoming G0-480-DIA's. Geared engine with pressure carburetors.
When reducing power, the engine will cough/sputter as soon as it hit's 21"
of
manifold pressure. Doesn't quit - just skips and runs a bit rough.
Doesn't happen when increasing power.
All gauge reading in the green - nothing obvious.
About 15 hours on the engines since major overhaul. Did not happen during
first
10-12hrs - started during past couple of flights. Won't happen every time
- but
about 75% of the time. Just a little disconcerting on final!
Any thoughts?
Matt
********************
Matthew Hawkins
Director, Marine Ops
R/V HUGH R. SHARP
302-645-4341
FAX: 302-645-4006
hawkins@udel.edu<mailto:hawkins@udel.edu>
________________________________
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|