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Leeverett
Joined: 07 Jan 2013
Posts: 14
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 Posted: Sun Feb 03, 2013 4:53 pm Post subject: Rough engine |
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I have been flying my 10 for 2 weeks. I have about 10 hours on the plane
Until today it has performed
faultlessly. What a joy! But today I had a significant increase in pucker
factor. While on downwind doing touch and goes the throttle stuck half
open. I advanced to full throttle and then it went to idle easily. But then the
engine started running very rough. I landed and it still was rough. I did a
mag check--no change. Tried leaning no difference. Any ideas? Stopped up fuel injector? Problem with Bendix servo? Thanx for advice.
Leon
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dave.saylor.aircrafters(a
Guest
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| Posted: Sun Feb 03, 2013 5:31 pm Post subject: Rough engine |
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If you have 6 EGTs see if you can find the odd temps. That'll give you some idea where to look. Could be in a nozzle or the divider or ??? Points wearing in the mags can cause roughness, also a failed plug. Reaching now, maybe you sucked in a baggie or a small bird? Water in the fuel? Let us know what you find.
--Dave
On Feb 3, 2013, at 16:53, "Leeverett" <Leeverett(at)msn.com> wrote:
| Quote: |
I have been flying my 10 for 2 weeks. I have about 10 hours on the plane
Until today it has performed
faultlessly. What a joy! But today I had a significant increase in pucker
factor. While on downwind doing touch and goes the throttle stuck half
open. I advanced to full throttle and then it went to idle easily. But then the
engine started running very rough. I landed and it still was rough. I did a
mag check--no change. Tried leaning no difference. Any ideas? Stopped up fuel injector? Problem with Bendix servo? Thanx for advice.
Leon
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393556#393556
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sun Feb 03, 2013 5:59 pm Post subject: Re: Rough engine |
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When you say the throttle stuck, do you mean it was physically hard to move? and after forcing to full throttle, it was easy?
I would look very carefully at the fuel servo, the arm, the control cable. It sounds like something may have bound up, then broke. Look up inside the fuel servo for any foreign objects.
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Bob Turner
RV-10 QB |
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carl.froehlich(at)verizon
Guest
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| Posted: Sun Feb 03, 2013 6:08 pm Post subject: Rough engine |
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On the throttle sticking, this is a real problem needing identification and
a fix before the next flight.
When you take the cowl off look for throttle cable abrasion on the aft
bottom of the oil sump. If you are using the throttle cable recommended by
Van's, many find it too short and it rubs against the bottom of the engine.
I replaced mine with the next size larger cable that Van's carries (the
50.5" one they list for the RV-7). Much better fit.
Other obvious inspection areas are cable linkage hardware (and if anything
is hitting on something). On the chance the rough engine is caused by the
same problem as the stuck throttle, look at the idle mixture linkage - make
sure you don't have something loose or going past center. Look at the
intake tubes as well. I once had one come loose on a rented plane - real
fun ride. I never flew at that place again.
A lot of other guesses possible, but not much matters until you get the cowl
off and look.
Carl
--
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jdriggs49(at)msn.com
Guest
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| Posted: Sun Feb 03, 2013 7:09 pm Post subject: Rough engine |
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the throttle was physically stuck half way. opening up the throttle and then pulling it back cleared the action. But then he says the engine went rough almost immediately. We pulled the cowl and I watched the cable and the linkage as he worked the throttle and there appeared to be no problem. Seems like way too much of a coincidence going from stuck throttle to rough engine within about ten seconds!?!? Really weird! Any thoughts??
| Quote: | Subject: RV10-List: Re: Rough engine
From: bobturner(at)alum.rpi.edu
Date: Sun, 3 Feb 2013 17:59:20 -0800
To: rv10-list(at)matronics.com
--> RV10-List message posted by: "Bob Turner" <bobturner(at)alum.rpi.edu>
When you say the throttle stuck, do you mean it was physically hard to move? and after forcing to full throttle, it was easy?
I would look very carefully at the fuel servo, the arm, the control cable. It sounds like something may have bound up, then broke. Look up inside the fuel servo for any foreign objects.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393561#393561
=====================
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[quote][b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Sun Feb 03, 2013 7:55 pm Post subject: Rough engine |
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Look inside the fuel servo at the throttle plate action. Look for loose throttle plate. The event sounds very much like something is amiss mechanically.
On Sun, Feb 3, 2013 at 8:03 PM, Danny Riggs <jdriggs49(at)msn.com (jdriggs49(at)msn.com)> wrote:
[quote] the throttle was physically stuck half way. opening up the throttle and then pulling it back cleared the action. But then he says the engine went rough almost immediately. We pulled the cowl and I watched the cable and the linkage as he worked the throttle and there appeared to be no problem. Seems like way too much of a coincidence going from stuck throttle to rough engine within about ten seconds!?!? Really weird! Any thoughts??
| Quote: |
--------
Bob Turner
> RV-10 QB
|
=====================
| Quote: |
get="_blank">http://www.matronics.com/Navigator?RV10-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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[b]
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Kelly McMullen
A&P/IA, EAA Tech Counselor
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dave.saylor.aircrafters(a
Guest
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| Posted: Sun Feb 03, 2013 8:06 pm Post subject: Rough engine |
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Quadrant or push-pull? Check the serrated joint where the arm
attaches to the throttle shaft, sometimes it can grab OK even if it's
not fully engaged. Also, check where the throttle and mixture cable
ends are attached, make sure there's no movement at either end.
Dave Saylor
831-750-0284 CL
On Sun, Feb 3, 2013 at 7:03 PM, Danny Riggs <jdriggs49(at)msn.com> wrote:
| Quote: | the throttle was physically stuck half way. opening up the throttle and
then pulling it back cleared the action. But then he says the engine went
rough almost immediately. We pulled the cowl and I watched the cable and the
linkage as he worked the throttle and there appeared to be no problem. Seems
like way too much of a coincidence going from stuck throttle to rough engine
within about ten seconds!?!? Really weird! Any thoughts??
> Subject: Re: Rough engine
> From: bobturner(at)alum.rpi.edu
> Date: Sun, 3 Feb 2013 17:59:20 -0800
> To: rv10-list(at)matronics.com
>
>
>
> When you say the throttle stuck, do you mean it was physically hard to
> move? and after forcing to full throttle, it was easy?
> I would look very carefully at the fuel servo, the arm, the control cable.
> It sounds like something may have bound up, then broke. Look up inside the
> fuel servo for any foreign objects.
>
> --------
> Bob Turner
> RV-10 QB
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=393561#393561
>
=====================
> _=============
>
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rene(at)felker.com
Guest
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| Posted: Sun Feb 03, 2013 8:15 pm Post subject: Rough engine |
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My servo has an AD for ???cover???cap??? that can come loose. It is safety wired in place but can come lose and will cause loss of power..
Have no idea if that helps…..
Rene’
N423CF
801-721-6080
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Kelly McMullen
Sent: Sunday, February 03, 2013 8:54 PM
To: rv10-list(at)matronics.com
Subject: Re: Re: Rough engine
Look inside the fuel servo at the throttle plate action. Look for loose throttle plate. The event sounds very much like something is amiss mechanically.
On Sun, Feb 3, 2013 at 8:03 PM, Danny Riggs <jdriggs49(at)msn.com (jdriggs49(at)msn.com)> wrote:
the throttle was physically stuck half way. opening up the throttle and then pulling it back cleared the action. But then he says the engine went rough almost immediately. We pulled the cowl and I watched the cable and the linkage as he worked the throttle and there appeared to be no problem. Seems like way too much of a coincidence going from stuck throttle to rough engine within about ten seconds!?!? Really weird! Any thoughts??
| Quote: |
--> RV10-List message posted by: "Bob Turner" <bobturner(at)alum.rpi.edu (bobturner(at)alum.rpi.edu)>
When you say the throttle stuck, do you mean it was physically hard to move? and after forcing to full throttle, it was easy?
I would look very carefully at the fuel servo, the arm, the control cable. It sounds like something may have bound up, then broke. Look up inside the fuel servo for any foreign objects.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393561#393561
|
=====================
01234567890123
[quote][b]
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jump2(at)sbcglobal.net
Guest
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| Posted: Sun Feb 03, 2013 8:27 pm Post subject: Rough engine |
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See if you lost a bolt( four) that holds air box on servo,inside of air box, Van at one time used some crappy bolt locks. The four bolts need to be safety wired.
Just one of many things.
Patrick thyssen
Breaking in new engine thanks to western skyways! Theirs is sitting on shipping crate.
Sent from my iPad
On Feb 3, 2013, at 9:03 PM, Danny Riggs <jdriggs49(at)msn.com (jdriggs49(at)msn.com)> wrote:
[quote] the throttle was physically stuck half way. opening up the throttle and then pulling it back cleared the action. But then he says the engine went rough almost immediately. We pulled the cowl and I watched the cable and the linkage as he worked the throttle and there appeared to be no problem. Seems like way too much of a coincidence going from stuck throttle to rough engine within about ten seconds!?!? Really weird! Any thoughts??
| Quote: |
===================================
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cs.com
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matronics.com/contribution
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jdriggs49(at)msn.com
Guest
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| Posted: Sun Feb 03, 2013 8:33 pm Post subject: Rough engine |
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Quadrant
| Quote: | From: dave.saylor.aircrafters(at)gmail.com
Date: Sun, 3 Feb 2013 20:05:57 -0800
Subject: Re: Re: Rough engine
To: rv10-list(at)matronics.com
--> RV10-List message posted by: Dave Saylor <dave.saylor.aircrafters(at)gmail.com>
Quadrant or push-pull? Check the serrated joint where the arm
attaches to the throttle shaft, sometimes it can grab OK even if it's
not fully engaged. Also, check where the throttle and mixture cable
ends are attached, make sure there's no movement at either end.
Dave Saylor
831-750-0284 CL
On Sun, Feb 3, 2013 at 7:03 PM, Danny Riggs <jdriggs49(at)msn.com> wrote:
> the throttle was physically stuck half way. opening up the throttle and
> then pulling it back cleared the action. But then he says the engine went
> rough almost immediately. We pulled the cowl and I watched the cable and the
> linkage as he worked the throttle and there appeared to be no problem. Seems
> like way too much of a coincidence going from stuck throttle to rough engine
> within about ten seconds!?!? Really weird! Any thoughts??
>
>> Subject: Re: Rough engine
>> From: bobturner(at)alum.rpi.edu
>> Date: Sun, 3 Feb 2013 17:59:20 -0800
>> To: rv10-list(at)matronics.com
>>
>> --> RV10-List message posted by: "Bob Turner" <bobturner(at)alum.rpi.edu>
>>
>> When you say the throttle stuck, do you mean it was physically hard to
>> move? and after forcing to full throttle, it was easy?
>> I would look very carefully at the fuel servo, the arm, the control cable.
>> It sounds like something may have bound up, then broke. Look up inside the
>> fuel servo for any foreign objects.
>>
>> --------
>> Bob Turner
>> RV-10 QB
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=393561#393561
>>
>>
>>
>>
>>
> =====================
>> _=============
>>
>>
>>
>
>
>
&g======================== |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sun Feb 03, 2013 8:33 pm Post subject: Rough engine |
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Good point. Depending on when the servo was built/overhauled, given
normal build time, it could have been right in the middle of the AD period.
Although that doesn't explain the stuck throttle.
On 2/3/2013 9:15 PM, Rene wrote:
| Quote: |
My servo has an AD for ???cover???cap??? that can come loose. It is
safety wired in place but can come lose and will cause loss of power..
Have no idea if that helps…..
Rene’
N423CF
801-721-6080
*From:*owner-rv10-list-server(at)matronics.com
[mailto:owner-rv10-list-server(at)matronics.com] *On Behalf Of *Kelly
McMullen
*Sent:* Sunday, February 03, 2013 8:54 PM
*To:* rv10-list(at)matronics.com
*Subject:* Re: Re: Rough engine
Look inside the fuel servo at the throttle plate action. Look for
loose throttle plate. The event sounds very much like something is
amiss mechanically.
On Sun, Feb 3, 2013 at 8:03 PM, Danny Riggs <jdriggs49(at)msn.com
<mailto:jdriggs49(at)msn.com>> wrote:
the throttle was physically stuck half way. opening up the throttle
and then pulling it back cleared the action. But then he says the
engine went rough almost immediately. We pulled the cowl and I watched
the cable and the linkage as he worked the throttle and there appeared
to be no problem. Seems like way too much of a coincidence going from
stuck throttle to rough engine within about ten seconds!?!? Really
weird! Any thoughts??
> Subject: Re: Rough engine
> From: bobturner(at)alum.rpi.edu <mailto:bobturner(at)alum.rpi.edu>
> Date: Sun, 3 Feb 2013 17:59:20 -0800
> To: rv10-list(at)matronics.com <mailto:rv10-list(at)matronics.com>
>
>
<bobturner(at)alum.rpi.edu <mailto:bobturner(at)alum.rpi.edu>>
>
> When you say the throttle stuck, do you mean it was physically hard
to move? and after forcing to full throttle, it was easy?
> I would look very carefully at the fuel servo, the arm, the control
cable. It sounds like something may have bound up, then broke. Look up
inside the fuel servo for any foreign objects.
>
> --------
> Bob Turner
> RV-10 QB
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=393561#393561
>
>
>
>
>
=====================
> _=============
>
>
>
* *
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD |
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Leeverett
Joined: 07 Jan 2013
Posts: 14
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| Posted: Mon Feb 04, 2013 4:30 am Post subject: Rough engine |
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Great ideas. I have a quadrant and there seems to be no binding of the throttle cable. I will pull the filtered air box off and look at the servo carefully. I also plan to do a compression check to rule out a stuck valve. I definitely will not fly the plane until the
mystery is solved.
Thanx
Leon Everett
| Quote: | From: dave.saylor.aircrafters@gmail.com
Date: Sun, 3 Feb 2013 20:05:57 -0800
Subject: Re: RV10-List: Re: Rough engine
To: rv10-list@matronics.com
--> RV10-List message posted by: Dave Saylor <dave.saylor.aircrafters@gmail.com>
Quadrant or push-pull? Check the serrated joint where the arm
attaches to the throttle shaft, sometimes it can grab OK even if it's
not fully engaged. Also, check where the throttle and mixture cable
ends are attached, make sure there's no movement at either end.
Dave Saylor
831-750-0284 CL
On Sun, Feb 3, 2013 at 7:03 PM, Danny Riggs <jdriggs49@msn.com> wrote:
> the throttle was physically stuck half way. opening up the throttle and
> then pulling it back cleared the action. But then he says the engine went
> rough almost immediately. We pulled the cowl and I watched the cable and the
> linkage as he worked the throttle and there appeared to be no problem. Seems
> like way too much of a coincidence going from stuck throttle to rough engine
> within about ten seconds!?!? Really weird! Any thoughts??
>
>> Subject: RV10-List: Re: Rough engine
>> From: bobturner@alum.rpi.edu
>> Date: Sun, 3 Feb 2013 17:59:20 -0800
>> To: rv10-list@matronics.com
>>
>> --> RV10-List message posted by: "Bob Turner" <bobturner@alum.rpi.edu>
>>
>> When you say the throttle stuck, do you mean it was physically hard to
>> move? and after forcing to full throttle, it was easy?
>> I would look very carefully at the fuel servo, the arm, the control cable.
>> It sounds like something may have bound up, then broke. Look up inside the
>> fuel servo for any foreign objects.
>>
>> --------
>> Bob Turner
>> RV-10 QB
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=393561#393561
>>
>>
>>
>>
>>
> =====================
>> _=============
>>
>>
>>
>
>
>
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bill.peyton
Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO
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| Posted: Mon Feb 04, 2013 5:34 am Post subject: Re: Rough engine |
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The throttle actuator arm also controls an idle mixture arm. There is an adjustment for your idle mixture and a linkage that causes it to move with the throttle. I would check to see if that linkage has come loose, broken etc. This would cause an extreme lean or rich condition depending on how it broke.
I also would not rule out the quadrant itself from having FOD drop into the linkage inside the cockpit.
As remote as this sounds, If you had a nut or bolt come loose in the servo and the engine injested it??
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Bill
WA0SYV
Aviation Partners, LLC |
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Wed Feb 06, 2013 9:27 pm Post subject: Re: Rough engine |
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I am with the loose nut, bolt, safety wire ingestion or servo mechanical. Check your alternate air hardware/rivets. If you don't find anything with a thorough inspection ...don't leave the pattern for a while. Let us know.
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Leeverett
Joined: 07 Jan 2013
Posts: 14
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| Posted: Sun Feb 10, 2013 5:12 pm Post subject: Re: Rough engine |
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I have a diagnosis for rough engine. I had flown the plane for 10 trouble free
hours. In the pattern the throttle stuck half open. I advanced full throttle
and it ran smoothly. About 10 seconds later the engine started running
rough. I landed uneventfully. Mag check rough on both mags. Throttle
action smooth. I did a compression check today. Cylinders 23456 all
76/80 or better. When I removed plug from #1 the electrode was severely
damaged. Unable to get any compression. I removed the filter air box and
found one of the 4 bolts that holds the box to the servo missing. The bolt
heads were not drilled and I did not safety wire them. I don't know it the
instructions say to or not. So my diagnosis (as a physician I can tell you that
is half the cure) is that the bolt vibrated loose then stuck in the throttle valve.
When I advanced the throttle the bolt went up the induction , past the intake
valve and into the cylinder where it did its damage. Obviously I will replace/
safety the bolts, remove and inspect/replace piston, cylinder, valves rods
etc. I will also scope the other cylinders. So I hope everyone has safeties the
bolts.
Leon Everett
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bill.peyton
Joined: 19 Sep 2010
Posts: 198
Location: St. Louis, MO
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| Posted: Sun Feb 10, 2013 5:25 pm Post subject: Re: Rough engine |
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Leon,
Glad you found the problem.
Bill
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Bill
WA0SYV
Aviation Partners, LLC |
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flying-nut(at)cfl.rr.com
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| Posted: Sun Feb 10, 2013 5:27 pm Post subject: Rough engine |
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Unfortunate indeed. Sorry you had the problem but grateful for your
sharing it. Be sure to check the whole induction system until you can
account for all the pieces. Debris has been known to migrate to other
cylinders. I know .... 'that's impossible' ...... and I can't explain
it, but it does happen.
Linn .... will safety those bolts when I get there!!!
On 2/10/2013 8:12 PM, Leeverett wrote:
| Quote: |
I have a diagnosis for rough engine. I had flown the plane for 10 trouble free
hours. In the pattern the throttle stuck half open. I advanced full throttle
and it ran smoothly. About 10 seconds later the engine started running
rough. I landed uneventfully. Mag check rough on both mags. Throttle
action smooth. I did a compression check today. Cylinders 23456 all
76/80 or better. When I removed plug from #1 the electrode was severely
damaged. Unable to get any compression. I removed the filter air box and
found one of the 4 bolts that holds the box to the servo missing. The bolt
heads were not drilled and I did not safety wire them. I don't know it the
instructions say to or not. So my diagnosis (as a physician I can tell you that
is half the cure) is that the bolt vibrated loose then stuck in the throttle valve.
When I advanced the throttle the bolt went up the induction , past the intake
valve and into the cylinder where it did its damage. Obviously I will replace/
safety the bolts, remove and inspect/replace piston, cylinder, valves rods
etc. I will also scope the other cylinders. So I hope everyone has safeties the
bolts.
Leon Everett
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394012#394012
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dave.saylor.aircrafters(a
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| Posted: Sun Feb 10, 2013 6:05 pm Post subject: Rough engine |
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Looking through the archives, it looks like there has been some
concern about these bolts being supplied un-drilled in the past,
though with locking tabs instead. I'm going to look tomorrow and make
sure I have safety wire on those bolts--I'm pretty sure I do. It's
standard practice for us to safety any piece of hardware that could be
ingested.
As Linn mentioned, I've heard of stuff (incredibly) bouncing from one
cylinder to another so check carefully!
Dave Saylor
831-750-0284 CL
On Sun, Feb 10, 2013 at 5:12 PM, Leeverett <Leeverett(at)msn.com> wrote:
| Quote: |
I have a diagnosis for rough engine. I had flown the plane for 10 trouble free
hours. In the pattern the throttle stuck half open. I advanced full throttle
and it ran smoothly. About 10 seconds later the engine started running
rough. I landed uneventfully. Mag check rough on both mags. Throttle
action smooth. I did a compression check today. Cylinders 23456 all
76/80 or better. When I removed plug from #1 the electrode was severely
damaged. Unable to get any compression. I removed the filter air box and
found one of the 4 bolts that holds the box to the servo missing. The bolt
heads were not drilled and I did not safety wire them. I don't know it the
instructions say to or not. So my diagnosis (as a physician I can tell you that
is half the cure) is that the bolt vibrated loose then stuck in the throttle valve.
When I advanced the throttle the bolt went up the induction , past the intake
valve and into the cylinder where it did its damage. Obviously I will replace/
safety the bolts, remove and inspect/replace piston, cylinder, valves rods
etc. I will also scope the other cylinders. So I hope everyone has safeties the
bolts.
Leon Everett
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394012#394012
|
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Strasnuts
Joined: 10 Feb 2009
Posts: 502
Location: Salt Lake City, UT
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| Posted: Sun Feb 10, 2013 7:13 pm Post subject: Rough engine |
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Thanks for sharing. Sorry there was damage. I have mine safetied. Not sure if it was plans or Scott Schmidt who instructed me.
Sent from my iPhone
On Feb 10, 2013, at 17:12, "Leeverett" <Leeverett(at)msn.com> wrote:
| Quote: |
I have a diagnosis for rough engine. I had flown the plane for 10 trouble free
hours. In the pattern the throttle stuck half open. I advanced full throttle
and it ran smoothly. About 10 seconds later the engine started running
rough. I landed uneventfully. Mag check rough on both mags. Throttle
action smooth. I did a compression check today. Cylinders 23456 all
76/80 or better. When I removed plug from #1 the electrode was severely
damaged. Unable to get any compression. I removed the filter air box and
found one of the 4 bolts that holds the box to the servo missing. The bolt
heads were not drilled and I did not safety wire them. I don't know it the
instructions say to or not. So my diagnosis (as a physician I can tell you that
is half the cure) is that the bolt vibrated loose then stuck in the throttle valve.
When I advanced the throttle the bolt went up the induction , past the intake
valve and into the cylinder where it did its damage. Obviously I will replace/
safety the bolts, remove and inspect/replace piston, cylinder, valves rods
etc. I will also scope the other cylinders. So I hope everyone has safeties the
bolts.
Leon Everett
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394012#394012
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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40936
RV-10 SB N801VR Flying
780 Hours
SuperSTOL 60 hours |
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Kellym
Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ
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| Posted: Sun Feb 10, 2013 7:52 pm Post subject: Rough engine |
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Vans has a service bulletin on this, calling for safetying the bolts.
96-10-1
On 2/10/2013 7:02 PM, Dave Saylor wrote:
| Quote: |
Looking through the archives, it looks like there has been some
concern about these bolts being supplied un-drilled in the past,
though with locking tabs instead. I'm going to look tomorrow and make
sure I have safety wire on those bolts--I'm pretty sure I do. It's
standard practice for us to safety any piece of hardware that could be
ingested.
As Linn mentioned, I've heard of stuff (incredibly) bouncing from one
cylinder to another so check carefully!
Dave Saylor
831-750-0284 CL
On Sun, Feb 10, 2013 at 5:12 PM, Leeverett <Leeverett(at)msn.com> wrote:
>
>
> I have a diagnosis for rough engine. I had flown the plane for 10 trouble free
> hours. In the pattern the throttle stuck half open. I advanced full throttle
> and it ran smoothly. About 10 seconds later the engine started running
> rough. I landed uneventfully. Mag check rough on both mags. Throttle
> action smooth. I did a compression check today. Cylinders 23456 all
> 76/80 or better. When I removed plug from #1 the electrode was severely
> damaged. Unable to get any compression. I removed the filter air box and
> found one of the 4 bolts that holds the box to the servo missing. The bolt
> heads were not drilled and I did not safety wire them. I don't know it the
> instructions say to or not. So my diagnosis (as a physician I can tell you that
> is half the cure) is that the bolt vibrated loose then stuck in the throttle valve.
> When I advanced the throttle the bolt went up the induction , past the intake
> valve and into the cylinder where it did its damage. Obviously I will replace/
> safety the bolts, remove and inspect/replace piston, cylinder, valves rods
> etc. I will also scope the other cylinders. So I hope everyone has safeties the
> bolts.
> Leon Everett
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=394012#394012
>
>
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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
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