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rveighta(at)comcast.net
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 Posted: Wed Oct 13, 2010 6:02 am Post subject: Lycoming IO-320 DIA Engine Problem |
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Guys, my neighbor in the airpark who is building an RV-9A, just began running his engine and it really runs rough - backfires,
black smoke, won't idle. He says he has set the timing properly. Any input will be appreciated as to the cause.
Thanks,
Walt Shipley
[quote][b]
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bgray(at)glasair.org
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| Posted: Wed Oct 13, 2010 6:14 am Post subject: Lycoming IO-320 DIA Engine Problem |
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Sounds like it’s running to rich a mixture.
Bruce
www.Glasair.org
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Jerry Grimmonpre'
Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142
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| Posted: Wed Oct 13, 2010 6:44 am Post subject: Lycoming IO-320 DIA Engine Problem |
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Walt ...
Black smoke is indicating too rich. Try turning off the boost pump if it's on, lean deeply as well.
Jerry Grimmonpre Just bought a lot at Hensley AP ... over on Kitty Hawk St
[quote] ---
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Wed Oct 13, 2010 7:15 am Post subject: Lycoming IO-320 DIA Engine Problem |
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There are all kinds of possibilities. Depends on who built the engine,
whether all accessory gears/cam are timed correctly, dry tappet
clearance correct, etc. Black smoke may or may not say anything about
mixture. Boost pump does not affect mixture on a Lycoming, only on a
Continental injected engine. No leaning should be necessary for startup,
only after it is running smoothly.
Also, whether mags have correct internal timing as well as the external
timing.
On 10/13/2010 7:41 AM, Jerry Grimmonpre wrote:
[quote] Walt ...
Black smoke is indicating too rich. Try turning off the boost pump if
it's on, lean deeply as well.
Jerry Grimmonpre Just bought a lot at Hensley AP ... over on Kitty
Hawk St
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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bgray(at)glasair.org
Guest
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| Posted: Wed Oct 13, 2010 7:23 am Post subject: Lycoming IO-320 DIA Engine Problem |
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You might also verify that the primer, if so equipped, is in the down and locked position.
Bruce
www.Glasair.org
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panamared505(at)brier.net
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| Posted: Wed Oct 13, 2010 8:08 am Post subject: Lycoming IO-320 DIA Engine Problem |
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I don't understand? Is there some special primer control that I should be using to control how I prime the engine? If so what is the part number in ACS.
Bob
[quote]
You might also verify that the primer, if so equipped, is in the down and locked position.
Bruce
www.Glasair.org
[b]
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bgray(at)glasair.org
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| Posted: Wed Oct 13, 2010 8:26 am Post subject: Lycoming IO-320 DIA Engine Problem |
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Sorry, injected engines don’t have primers.
Bruce
www.Glasair.org
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bell
Joined: 26 Aug 2009
Posts: 17
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| Posted: Wed Oct 13, 2010 8:28 am Post subject: Lycoming IO-320 DIA Engine Problem |
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First thing I would check is for an open primer solenoid if it had a carb..but since it doesnt… do the usual checks on the injection system…Is it really backfiring, which would be an ignition/preignition problem or is the racket due to unburned fuel igniting in the exhaust system? Since it is also running rough, as simple as it sounds, spark plug wires to the wrong cylinders could cause all these symptoms. The cylinders that aren’t firing would be dumping fuel into the exhaust…its fun to listen to but it is really rough on exhaust components..just my two c ents worth..
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Bruce Gray
Sent: Wednesday, October 13, 2010 9:12 AM
To: rv-list(at)matronics.com
Subject: RE: Lycoming IO-320 DIA Engine Problem
Sounds like it’s running to rich a mixture.
Bruce
www.Glasair.org
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jjessen01
Joined: 27 Sep 2010
Posts: 50
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| Posted: Wed Oct 13, 2010 8:33 am Post subject: Lycoming IO-320 DIA Engine Problem |
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Not sure the fuel injected engines come with a primer. But, what Bruce says is correct. If you do have a primer pump mounted on the panel and it’s left unlocked, it’ll leak directly into the heads, saturate the air intake tube seals, whereby gas will run down the outside of the tubes, especially if left overnight, and so on. Doubt that you’d have this with a fuel injection engine, which typically uses the electric fuel pump to prime.
John J
Oh, and ask me how I know. I even have pictures…
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Panama Red
Sent: Wednesday, October 13, 2010 9:06 AM
To: rv-list(at)matronics.com
Subject: Re: Lycoming IO-320 DIA Engine Problem
I don't understand? Is there some special primer control that I should be using to control how I prime the engine? If so what is the part number in ACS.
Bob
| Quote: |
You might also verify that the primer, if so equipped, is in the down and locked position.
Bruce
www.Glasair.org
http://www.matronics.com/Navigator?RV-List |
0123456789
[quote][b]
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bell
Joined: 26 Aug 2009
Posts: 17
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| Posted: Wed Oct 13, 2010 10:47 am Post subject: Lycoming IO-320 DIA Engine Problem |
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One more thing to check…if the timing was set without tripping the impulse couplings, the engine will start but the timing will advance to approx 50 deg advanced when the couplings disengage…this mistake is real easy to make if you haven’t timed many engines.. it can also happen to experienced mechanics if they are distracted…rotate the prop in the direction of rotation and listen for the mags to snap…this should occur at approx tdc…if one or both snap at the timing mark..it/they are improperly timed …to time them you should rotate the prop until the mags fire then rotate back to just past the timing mark…..then forward…don’t go too far or the impulse couplings will reengage..
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of John J
Sent: Wednesday, October 13, 2010 11:27 AM
To: rv-list(at)matronics.com
Subject: RE: Lycoming IO-320 DIA Engine Problem
Not sure the fuel injected engines come with a primer. But, what Bruce says is correct. If you do have a primer pump mounted on the panel and it’s left unlocked, it’ll leak directly into the heads, saturate the air intake tube seals, whereby gas will run down the outside of the tubes, especially if left overnight, and so on. Doubt that you’d have this with a fuel injection engine, which typically uses the electric fuel pump to prime.
John J
Oh, and ask me how I know. I even have pictures…
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Panama Red
Sent: Wednesday, October 13, 2010 9:06 AM
To: rv-list(at)matronics.com
Subject: Re: Lycoming IO-320 DIA Engine Problem
I don't understand? Is there some special primer control that I should be using to control how I prime the engine? If so what is the part number in ACS.
Bob
| Quote: |
You might also verify that the primer, if so equipped, is in the down and locked position.
Bruce
www.Glasair.org
http://www.matronics.com/Navigator?RV-List http://forums.matronics.com http://www.matronics.com/contribution |
01234567890123456789
No virus found in this incoming message.
Checked by AVG - www.avg.com
01:34:00
[quote][b]
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Wed Oct 13, 2010 12:12 pm Post subject: Lycoming IO-320 DIA Engine Problem |
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If mags are in use, rather than electronic, they are not set at more
than 25 degrees on a Lycoming, never anywhere close to 50 degrees. Even
the electronic don't advance beyond 40 degrees at low power in flight.
On 10/13/2010 11:38 AM, Glenn Bell wrote:
| Quote: |
One more thing to check…if the timing was set without tripping the
impulse couplings, the engine will start but the timing will advance
to approx 50 deg advanced when the couplings disengage…this mistake is
real easy to make if you haven’t timed many engines.. it can also
happen to experienced mechanics if they are distracted…rotate the prop
in the direction of rotation and listen for the mags to snap…this
should occur at approx tdc…if one or both snap at the timing
mark..it/they are improperly timed …to time them you should rotate the
prop until the mags fire then rotate back to just past the timing
mark…..then forward…don’t go too far or the impulse couplings will
reengage..
*From:* owner-rv-list-server(at)matronics.com
[mailto:owner-rv-list-server(at)matronics.com] *On Behalf Of *John J
*Sent:* Wednesday, October 13, 2010 11:27 AM
*To:* rv-list(at)matronics.com
*Subject:* RE: Lycoming IO-320 DIA Engine Problem
Not sure the fuel injected engines come with a primer. But, what Bruce
says is correct. If you do have a primer pump mounted on the panel and
it’s left unlocked, it’ll leak directly into the heads, saturate the
air intake tube seals, whereby gas will run down the outside of the
tubes, especially if left overnight, and so on. Doubt that you’d have
this with a fuel injection engine, which typically uses the electric
fuel pump to prime.
John J
Oh, and ask me how I know. I even have pictures…
*From:* owner-rv-list-server(at)matronics.com
[mailto:owner-rv-list-server(at)matronics.com] *On Behalf Of *Panama Red
*Sent:* Wednesday, October 13, 2010 9:06 AM
*To:* rv-list(at)matronics.com
*Subject:* Re: Lycoming IO-320 DIA Engine Problem
I don't understand? Is there some special primer control that I should
be using to control how I prime the engine? If so what is the part
number in ACS.
Bob
*You might also verify that the primer, if so equipped, is in the
down and locked position.*
* *
Bruce
www.Glasair.org <http://www.Glasair.org>
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Checked by AVG - www.avg.com
01:34:00
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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bgray(at)glasair.org
Guest
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| Posted: Wed Oct 13, 2010 12:35 pm Post subject: Lycoming IO-320 DIA Engine Problem |
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That's not what he said. IF the mags were timed with the impulse coupler
still engaged they could be WAY off.
Bruce
www.Glasair.org
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bell
Joined: 26 Aug 2009
Posts: 17
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| Posted: Wed Oct 13, 2010 12:48 pm Post subject: Lycoming IO-320 DIA Engine Problem |
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That is correct...provided that the installer tripped the impulse coupling
before timing them to the engine...if he/she didn't, the engine will be
timed approx 50 deg advanced
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