Non RV, but spot the problem...

cjensen · Post by **cjensen** » Fri Apr 20, 2007 3:56 pm

Can anyone tell me what's wrong in this picture? I'll give you more pics after someone notices...

captain_john · Post by **captain_john** » Fri Apr 20, 2007 4:08 pm

Can I see the base of cylinder number 1?

CJ

James Ball · Post by **James Ball** » Fri Apr 20, 2007 4:22 pm

How much time is on it ?

From: RB Lists - Aircraft Engines [mailto:support@rivetbangers.com]
Sent: Friday, April 20, 2007 3:56 PM
To: aircraftengines@rivetbangers.com
Subject: Non RV, but spot the problem...

Can anyone tell me what's wrong in this picture? I'll give you more pics after someone notices...

Chad "WV" Jensen
N755CB RV-7 E6 Subaru, Tip up
SB Fuselage, working inside the upside-down canoe
www.chadandbrittne.com/RV-7.htm

rivetbangers.com - Discussion topic http://www.rivetbangers.com/cgi-php/forums/viewtopic.php?p=17065#17065

Submitted via email

cjensen · Post by **cjensen** » Fri Apr 20, 2007 4:27 pm

Yup. But it's not where you think it would be...

It pulled the intake tube right out of the sump as well...turned it in to a normally aspirated cylinder instantly.

CJ gets the prize. Not sure what he gets, but he gets it.

This happened today on a Navajo. They took off from here this morning on a photo flight, and developed a rough running engine. This was the cause, obviously.

cjensen · Post by **cjensen** » Fri Apr 20, 2007 4:40 pm

James Ball wrote:How much time is on it ?

About 800 hours.

captain_john · Post by **captain_john** » Fri Apr 20, 2007 5:33 pm

Hmmmm, if there is nothing foreign in the bore, the piston swelled within the jug and ripped it apart!

Is this operator an lean of peak guy?

If so, he better do some more reading.

WOW!

That looks like about 5,000 to me!

CJ

rv8or · Post by **rv8or** » Fri Apr 20, 2007 5:46 pm

My guess was gonna be "It doesn't say Subaru on it?"

But then I scrolled down and saw the rest of the pics.

Glad they got back safely!

Joe

cjensen · Post by **cjensen** » Fri Apr 20, 2007 6:26 pm

RV8or wrote:My guess was gonna be "It doesn't say Subaru on it?"

Joe

Good one Joe! That IS what I was thinkin', but thought I'd let the others have a chance.

Post by **Spike** » Fri Apr 20, 2007 6:27 pm

captain_john wrote: Is this operator an lean of peak guy?

If so, he better do some more reading.

What a bunch of rhetoric John! A guy loses a cylinder and you immediately want to blame it on LOP operations? Thats a bit of a stretch don't ya think?

cjensen · Post by **cjensen** » Fri Apr 20, 2007 6:30 pm

Don't know what's wrong with it yet. The shop doesn't have time to get to it until late next week.

I will certainly give an update when I hear what happened.

$5k is probably about right...that'd be a whole NEW engine for me!!

captain_john · Post by **captain_john** » Fri Apr 20, 2007 6:55 pm

Rhetoric? Hmmmm, no... just wondering. Do you know the answer to the question?

The stretch is in the cylinder!

CJ

Post by **Spike** » Fri Apr 20, 2007 7:16 pm

captain_john wrote:Rhetoric? Hmmmm, no... just wondering. Do you know the answer to the question?

Nope, and as such I didnt try to postulate on it or the pilots operating habits.

The stretch is in the cylinder!

CJ

Yeah man. Ugly looking too.

captain_john · Post by **captain_john** » Fri Apr 20, 2007 7:20 pm

To postulate was the intent of the thread.

I merely complied.

CJ

jim_geo · Post by **jim_geo** » Fri Apr 20, 2007 11:22 pm

Well I think he sucked a bird.

Wicked Stick · Post by **Wicked Stick** » Sat Apr 21, 2007 9:12 am

Maybe it was a flying squirrel he sucked in from that low pass over the house.

captain_john · Post by **captain_john** » Sat Apr 21, 2007 11:13 am

Hahaha, I see that flying squirrels are on your mind since I emailed you that last video!

CJ

cjensen · Post by **cjensen** » Mon Apr 23, 2007 4:25 pm

Well, how's this for an explaination of what happened...

It just happens. This is a known weak spot where the top and bottom of the barrel come together. No piston swelling, no improper leaning, it just happens.

The guys in our shop have seen this several times before, and they all agree that it's not an uncommon problem with overhauled cylinders. These were second run cylinders as far as we know.

They are talking about overhauling the whole engine because of unknown damage elsewhere. So, that $5k for one cylinder just went to $40k...

Post by **Spike** » Mon Apr 23, 2007 4:42 pm

Youch, that hurts. But then, they successfully flew it back to the airport, etc. Im glad they still have the option.

RivetBangers.com