Apparently I had a beach for a while!

Llewtrah381

Llewtrah381

Cleared for Takeoff
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Llewtrah
My Warrior went in for Annual with basically nothing on the squawk sheet (always worrisome for me). Sure enough, #2 was about 30PSI. The borescope showed a healthy valve despite the leak coming from the exhaust, so they lapped it and brought the pressure up.

But…

The scope also showed a TON of lead deposits. Dang. I’ve never seen this much!

E7D6B7D1-7D82-4504-8C31-DA800F5AFBDC.jpeg

I always lean very aggressively and even keep it leaned until close to when I land.

I now have my own borescope and will probably take a peek at each oil change.
 
You mean all those clear crystals are lead? Looks like sand to me.
 
Llewtrah381 said:
My Warrior went in for Annual with basically nothing on the squawk sheet (always worrisome for me). Sure enough, #2 was about 30PSI. The borescope showed a healthy valve despite the leak coming from the exhaust, so they lapped it and brought the pressure up.

But…

The scope also showed a TON of lead deposits. Dang. I’ve never seen this much!

View attachment 114228

I always lean very aggressively and even keep it leaned until close to when I land.

I now have my own borescope and will probably take a peek at each oil change.
Click to expand...
I took all 4 cylinders off a 0-320 and cleaned up the pistons and rings. Then put it back together with very good results. It only cost me my time and O rings, valve cover gaskets. It seems it could be done on small 4 cylinders engines without too much expense?
No?
 
Gary Ward said:
I took all 4 cylinders off a 0-320 and cleaned up the pistons and rings. Then put it back together with very good results. It only cost me my time and O rings, valve cover gaskets. It seems it could be done on small 4 cylinders engines without too much expense?
No?
Click to expand...
Valves can be lapped without removing the cylinder, did it on my O-290 recently. But to the OP, what did you do about the lead deposits?
 
I am so looking forward to using G100UL...

I lean aggressively, but the fuel induction system on O-470's is so primitive, you know you're not effectively burning everything.
 
Dana said:
But to the OP, what did you do about the lead deposits?
Click to expand...
(I’m pretty sure) they blew them out. In any case, I have the plane home now and will probably scope the cylinders to confirm.

Not sure what caused that. I had an ElectroAir installed about 20 hours ago and wonder if the spark advance makes running rich make lead deposits rather than carbon. Just an uneducated guess.
 
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