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Exhaust Valve

S

stneki

Well Known Member
Patron
On my O-360 carb ECI engine I have about 25 hours since new. It has always been rough running. My GRT EIS shows a very erratic EGT on the # 4cylinder. I checked the exhaust valve with a bore scope and did a leak down test and both are normal.

I removed the exhaust valve spring and checked the exhaust valve wobble with a dial indicator and it showed about .008 play with a cold cylinder.

Is this the correct amount of play or to tight. If to tight, what size reamer do I use?

Thank you in advance for your help.

Steve
 
0.008 is a tight valve, however that measurement is only valid if you use the geometry of the tool specified in the SB.

Basically, the valve is pushed in about 1/4 inch and the wobble is measured near the middle of a fitting clamped to the top of the valve stem. The wobble is then measured in a vertical direction.

Any other measurement location doesn't really meet the reference numbers in the SB.
 
dongor2 said:
This looks like trouble. Does this SB apply to all Lycoming engine serial numbers?
Click to expand...

"MODELS AFFECTED: All Lycoming reciprocating aircraft engines unless installed in a rotary-wing aircraft."


Helicopter engines are affected, but on a more frequent time schedule.
 
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