bing bing bing BANG bing bing bing BANG

The saga continues.

Compression (over 80) 70 52 50 42 All ring leakage.

So this; plus very tight Exhaust Valve likely accounts for low power. ( bings)

So the lowest jug was pulled.

No cross hatch. 500 hrs since o/h.


The BANG was caused by the Crossover Stack up front that was

completely broken!

Prior Owner says it has always been noisy.

Also says a Compression Check was NOT done at the last Annual due

to low hours.

It’s now about 12 hours since that inspection.

Pulled another jug and it looks like the Cam and Followers are fine.

Oh well; at least the paint is nice!


BTW— The O-235 C1B has gained the notoriety of the O-290 D2.

New cylinders ( if you can find them) are $2000 each!
 
All this time and nobody said anything like, "you heard a 'bing bing' sound from impact action on something metallic inside your engine and your first thought was to fly it?"

No crosshatch? Bad break-in.

Somebody did mention that clearances need to be checked at 100-hr intervals. Brownie points to you!

I once had this same engine fail to reach static RPM after cylinders and it turned out the case halves were fretting and the main bearings were constricting the crankshaft.
 
Purchased in Missouri 1 year ago.

New Owner and CFI flew to New York plus another 2 hrs.

Aircraft has not flown since September.

So it’s about 12 hrs since last Annual.

Can’t see how New Owner is to blame for the issues.
 
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Lack of crosshatch is no big deal. It's put there initially to cause the rings to seat properly. If it was a shallow crosshatch it can disappear like that. If it's too deep it will hold too much oil after break-in and oil consumption will remain high.

Did the mechanic wiggle the prop some to get proper ring seating on the compression test? Those numbers are really bad for any Lycoming. Unbelievably bad. So bad that I suspect technique or a bad compression tester might be at fault. A contaminated orifice inside the tester will do it. That orifice is only .040" in diameter and .250" long. Easy to get a tiny bit of junk in the air inlet that could do that.
 
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