Today's Message Index:
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1. 03:15 PM - Re: Failed intake valve (Tim Shankland)
2. 06:01 PM - Re: Failed intake valve (ANDY N FULTZ)
Message 1
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| Subject: | Re: Failed intake valve |
Andy F,
That fits in with what I would expect, exhaust valves tend to fail due
the the heat but mine is the first I have heard of of an intake valve
just breaking. I am picking up both heads tomorrow. I had all the valves
replaced. For the cost it is not worth the risk.
Tim
From: ANDY N FULTZ
Sent: Tuesday, December 27, 2016 10:21 AM
Subject: Re: Stratus-List: Failed intake valve
Sorry Tim for taking so long to reply, but just made it back to the
hangar to confirm. It was an exhaust valve on the number 3 cylinder.
Andy F
Sent from my iPhone
On Dec 20, 2016, at 6:15 PM, Tim Shankland <tshankland@sbcglobal.net>
wrote:
Andy F,
Was your failure also an intake valve?
Tim
From: ANDY N FULTZ
Sent: Tuesday, December 20, 2016 5:29 PM
To: stratus-list@matronics.com
Subject: Re: Stratus-List: Failed intake valve
Looks and sounds like you got lucky. I had a similar incident at about
285 hours except that the entire valve broke on climb out at about 500
AGL. It destroyed the piston, bent the connecting rod and locked up the
engine. All in about 2-2.5 seconds. Thankfully I was able to do a 180
and land back on the runway. Had to replace the engine as I also had
holes in the case and a severely damaged cylinder. I replaced mine with
a RAM Performance long block.
Been going well now for about 300 hours.
Andy F
Sent from my iPhone
On Dec 19, 2016, at 9:25 PM, Tim Shankland <tshankland@sbcglobal.net>
wrote:
As I sometimes tell my wife when I come home from the airport, I had
a little excitement today, she never like to hear that. The excitement I
had about two weeks ago occurred on climb out, I h was at full power and
about 2500 feet about a mile or so from the airport. There was a
distinct change in engine sound with some loss of power and vibration.
After completing the instant 180 back toward the airport I reduced power
and check gauges. Everything was fine, oil pressure and temperature.
Since I still had power and was high I descended to pattern altitude and
landed. The engine continued to run rough but with no mechanical noise.
I was able to taxi back to the hanger. I quick check showed all plug
wires attached and everything looked normal. Coming back the next day I
pulled the spark plugs, None were damaged although the ones on the port
side looked damp. Checking compression the back port cylinder had zero
compression. I pulled of the cowling and rocker arm covers. The valve
train was intact and working, the only change was that the .014 gap on
the exhaust valve was gone. I loosened the adjustment and checked
compression again still zero. Putting a hose the spark plug hole and
blowing I could hear the sound in the carburetor. I order not to have to
take the engine off I build a stand to hold the engine with the top
mounts removed. The attached picture is what I found. The exhaust valve
showed no damage or change but a large piece of the intake valve was
missing. A little shaking of the head dropped the piece out. It had been
blown into the intake manifold in the head and remained lodged there. As
large as it was it might not have been able to come out unless lined up
perfectly. The only mark on the piston or head was a small scratch that
you could have made with a screwdriver. To make the issue more confusing
the other two small pieces in the picture also fell out of the head.
They are aluminum and look as though they had broken off a cylindrical
section but with otherwise undamaged , thus they did not get into the
combustion chamber. My problem is I don=99t know where they came
from. They are not from the head itself, the manifold in not aluminum
and I can=99t find any damage to the carburetor. I recently
replaced the air filters, maybe they were lodged in there. Has anyone
else had an intake valve fail like this. Being cautious I took the other
head off and both are now in the shop having all valves replaced. I have
a little over 300 hours on the engine and there was no evidence of guide
movement. Any experience with this type of failure would be
appreciated.
Tim Shankland
<100_4061.JPG>
Message 2
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| Subject: | Re: Failed intake valve |
I'm just glad your valve problem didn't cost you an entire long block like m
ine did =F0=9F=98. Good luck getting back in the air soon.
Andy F
Sent from my iPhone
> On Dec 28, 2016, at 5:15 PM, Tim Shankland <tshankland@sbcglobal.net> wrot
e:
>
> Andy F,
> That fits in with what I would expect, exhaust valves tend to fail due the
the heat but mine is the first I have heard of of an intake valve just brea
king. I am picking up both heads tomorrow. I had all the valves replaced. Fo
r the cost it is not worth the risk.
>
> Tim
>
> From: ANDY N FULTZ
> Sent: Tuesday, December 27, 2016 10:21 AM
> To: stratus-list@matronics.com
> Subject: Re: Stratus-List: Failed intake valve
>
> Sorry Tim for taking so long to reply, but just made it back to the hangar
to confirm. It was an exhaust valve on the number 3 cylinder.
>
> Andy F
>
> Sent from my iPhone
>
>> On Dec 20, 2016, at 6:15 PM, Tim Shankland <tshankland@sbcglobal.net> wro
te:
>>
>> Andy F,
>> Was your failure also an intake valve?
>> Tim
>>
>> From: ANDY N FULTZ
>> Sent: Tuesday, December 20, 2016 5:29 PM
>> To: stratus-list@matronics.com
>> Subject: Re: Stratus-List: Failed intake valve
>>
>> Looks and sounds like you got lucky. I had a similar incident at about 28
5 hours except that the entire valve broke on climb out at about 500 AGL. It
destroyed the piston, bent the connecting rod and locked up the engine. All
in about 2-2.5 seconds. Thankfully I was able to do a 180 and land back on t
he runway. Had to replace the engine as I also had holes in the case and a s
everely damaged cylinder. I replaced mine with a RAM Performance long block.
>> Been going well now for about 300 hours.
>>
>> Andy F
>>
>> Sent from my iPhone
>>
>>> On Dec 19, 2016, at 9:25 PM, Tim Shankland <tshankland@sbcglobal.net> wr
ote:
>>>
>>> As I sometimes tell my wife when I come home from the airport, I had a l
ittle excitement today, she never like to hear that. The excitement I had ab
out two weeks ago occurred on climb out, I h was at full power and about 250
0 feet about a mile or so from the airport. There was a distinct change in e
ngine sound with some loss of power and vibration. After completing the inst
ant 180 back toward the airport I reduced power and check gauges. Everything
was fine, oil pressure and temperature. Since I still had power and was h
igh I descended to pattern altitude and landed. The engine continued to run r
ough but with no mechanical noise. I was able to taxi back to the hanger. I q
uick check showed all plug wires attached and everything looked normal. Comi
ng back the next day I pulled the spark plugs, None were damaged although th
e ones on the port side looked damp. Checking compression the back port cyli
nder had zero compression. I pulled of the cowling and rocker arm covers. Th
e valve train was intact and working, the only change was that the .014 gap o
n the exhaust valve was gone. I loosened the adjustment and checked compress
ion again still zero. Putting a hose the spark plug hole and blowing I could
hear the sound in the carburetor. I order not to have to take the engine of
f I build a stand to hold the engine with the top mounts removed. The attach
ed picture is what I found. The exhaust valve showed no damage or change but
a large piece of the intake valve was missing. A little shaking of the head
dropped the piece out. It had been blown into the intake manifold in the he
ad and remained lodged there. As large as it was it might not have been able
to come out unless lined up perfectly. The only mark on the piston or head w
as a small scratch that you could have made with a screwdriver. To make the i
ssue more confusing the other two small pieces in the picture also fell out o
f the head. They are aluminum and look as though they had broken off a cylin
drical section but with otherwise undamaged , thus they did not get into the
combustion chamber. My problem is I don=99t know where they came from
. They are not from the head itself, the manifold in not aluminum and I can
=99t find any damage to the carburetor. I recently replaced the air filte
rs, maybe they were lodged in there. Has anyone else had an intake valve fai
l like this. Being cautious I took the other head off and both are now in th
e shop having all valves replaced. I have a little over 300 hours on the eng
ine and there was no evidence of guide movement. Any experience with this t
ype of failure would be appreciated.
>>>
>>> Tim Shankland
>>> <100_4061.JPG>
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