Today's Message Index:
----------------------
1. 07:21 AM - Re: Failed intake valve (ANDY N FULTZ)
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 |
|
| Subject: | Re: Failed intake valve |
Sorry Tim for taking so long to reply, but just made it back to the hangar t
o 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> wrot
e:
>
> 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 d
estroyed the piston, bent the connecting rod and locked up the engine. All i
n about 2-2.5 seconds. Thankfully I was able to do a 180 and land back on th
e runway. Had to replace the engine as I also had holes in the case and a se
verely 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> wro
te:
>>
>> As I sometimes tell my wife when I come home from the airport, I had a li
ttle excitement today, she never like to hear that. The excitement I had a
bout two weeks ago occurred on climb out, I h was at full power and about 25
00 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>
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! --
|