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Posted

UUGGGHHHH !!!

 

I don't mind doing this so much when it's a paying customer.... but this is my own machine! I'd much rather be fishing on a friday afternoon, that's for sure.

 

They don't make fuel like they use to... exhaust valve guides shot after 215 hours. Clearance is like throwing a wiener down a hallway.

engine1.jpg

engine2.jpg

engine3.jpg

Posted

That's about how it works Raf. New valve guides and we'll "buff" them to size! lol

 

Tomorrow I'm gonna change the oils in the Verado and Kicker, winterize the plumbing and get the boat ready for Muskie hunting!

Posted

Did they start adding Ethanol to avgas??? or is it the lower sulfur?? that seems not near enough hours to burn exhaust guides. I have never seen/worked with aircraft motors but in diesel language it seems like a short time. I am sure you will get it straighted out and back together quick enough.

 

Art

Posted

Art, the old WWII technology is designed to run on 80/87.. which has about 5 times less lead in it than the 100LL that we can only get now. 100LL has about 15 times the lead in it that our LEADED regular car fuel use to have. It's the extra lead that causes valve sticking and erosion. The guides don't really get burnt, they just get worn away until they get so sloppy the valve stem can coc k and break.

 

 

I hate the smell of car gas in an airplane, but I'm thinking I'm going to have to go that way and use premium and lead additive to create something similar to the 80/87. Just becomes a PITA constantly checking fuel sources for ethanol before filling the jugs/aircraft fuel tank. As ethanol is an absolute no no in an aircraft and it's sealed fuel tanks.

  • 2 weeks later...
Posted (edited)

Well I made the right call pulling them all off and it's the best $1200 I ever spent. It was going to be a WHOLE LOT MORE expensive if I let it go for a few more hours... as it was going to be catastrophic!

 

valve1.jpg

 

valve2.jpg

 

valve3.jpg

 

Now to put "humpty" back together again, now that the cylinders/valves are all redone.

Edited by irishfield
Posted

Cracked Valves!! Ouch, that will leave a mark!!! I'd hate to imagine what would happen if it broke during flight, you'd have a real nose heavy glider.

Posted

yeah real good call

 

but you should be muskie fishing instead

 

Agreed. It looks like a great winter project. Since it's still fall...goGonefishing.gif Nice to know that you'll be around for a while and didn't leave this repair until it was too late.

Posted

"Clearance is like throwing a wiener down a hallway. "

 

glad I read further thought this was a thread about my sex life .carry on

 

 

Well you are eventually bound to touch the sides...

 

G

Guest gbfisher
Posted

The title should've been "What'd ya do friday morning until noon".

 

 

and,,,,,,you won't wanna know... :thumbsup_anim:

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