Today's Message Index:
----------------------
1. 05:13 PM - Re: Rough engine (Leeverett)
2. 05:26 PM - Re: Rough engine (bill.peyton)
3. 05:27 PM - Re: Re: Rough engine (Linn)
4. 06:05 PM - Re: Re: Rough engine (Dave Saylor)
5. 07:13 PM - Re: Re: Rough engine (Seano)
6. 07:19 PM - Blown out Wheel pant (Seano)
7. 07:38 PM - Re: Blown out Wheel pant (rv10flyer)
8. 07:47 PM - Re: Re: Blown out Wheel pant (Seano)
9. 07:52 PM - Re: Re: Rough engine (Kelly McMullen)
Message 1
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| Subject: | Re: Rough engine |
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
Message 2
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| Subject: | Re: Rough engine |
Leon,
Glad you found the problem.
Bill
--------
Bill
WA0SYV
Aviation Partners, LLC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394016#394016
Message 3
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| Subject: | Re: Rough engine |
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:
>
> 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
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
>
>
Message 4
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| Subject: | Re: Rough engine |
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@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
>
>
Message 5
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| Subject: | Re: Rough engine |
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@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
>
>
>
>
>
>
>
>
>
>
Message 6
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| Subject: | Blown out Wheel pant |
Thought I would share my wheel pant blow out story. I originally cut my pants about
5/8 " around the tires. I flew 300 hours before exchanging the factory mains
with desser re-treads. I was dumb not to open the holes up on the pants. Visually
the dessers look more square than the originals. I figured the clearance
was fine when I quickly looked them over. I landed heavy in Tucson and smelled
rubber. I thought it was from the md-90 that landed in front if me. Later
I found out the wheel bulged enough on a soft landing and grabbed both sides
of the rear pant. I was able to pull the ripped sides back down and tear them
away so I could fly home. I had to rebuild the bottom and repaint. Of course I
opened both sides to 1" all around the tire. Just thought I would share to hopefully
save someone time rebuilding their pants.
Sent from my iPhone
Message 7
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| Subject: | Re: Blown out Wheel pant |
What was your tire pressure reading when you removed the pants? I need to recheck
my pressures. I usually run 10 psi higher than Van's numbers, making it easier
to move solo.
I have the same tires in stock, so thanks for the reminder. Any changes in out
of round or shimmy going to Desser?
--------
Wayne G.
SB 12/01/2009-12/01/2011
TT= 97.6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=394026#394026
Message 8
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| Subject: | Re: Blown out Wheel pant |
I keep 50psi on the mains. I also made wood stiffeners for mine. Dessers felt smoother
than the originals and I've heard they last a lot longer. I have no shimmy
but that's from the stiffeners.
Sent from my iPhone
On Feb 10, 2013, at 19:38, "rv10flyer" <wayne.gillispie@gmail.com> wrote:
>
> What was your tire pressure reading when you removed the pants? I need to recheck
my pressures. I usually run 10 psi higher than Van's numbers, making it easier
to move solo.
>
> I have the same tires in stock, so thanks for the reminder. Any changes in out
of round or shimmy going to Desser?
>
> --------
> Wayne G.
> SB 12/01/2009-12/01/2011
> TT= 97.6
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=394026#394026
>
>
>
>
>
>
>
>
>
>
Message 9
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| Subject: | Re: Rough engine |
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:
>
> 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@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
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
-----
No virus found in this message.
Checked by AVG - www.avg.com
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