Lycoming prop oil control leak down test - Page 2

miyu1975 · #11 06-29-2018, 12:15 PM

Divco did not cover my cost, time, labor, or frustration, and instead told me their warranty does not cover such cost. They did however cover the bill from BPE.

Noah · #12 06-29-2018, 02:29 PM

Glad to hear you finally got this resolved Ryan!

I'm curious why hollow pins would ever be used in this application?

lr172 · #13 07-01-2018, 12:18 PM

Quote:

Originally Posted by miyu1975

I am happy to report that my engine/prop issue has been resolved. After ruling out any prop governor or prop issue I removed the engine and shipped it back to BPE for tear down inspection. It didn?t take long for Allen to find the problem. Divco inserted the wrong pins in the case at the front main bearing location. They inserted hollow pins instead of solid pins. The hollow pins were allowing the oil to leak back into the crankcase. Divco picked up the tab and Allen put it all back together. 5 hours flying now and all is good. Nice to back in the air again. Now I gotta finish this ATP thing...

Thanks all for the help...

Which pins are you referring to? My case just got back from Divco and I would like to leverage your experience to ensure they didn't make the same mistake on mine.

Larry

miyu1975 · #14 07-01-2018, 07:29 PM

The pins are located where the front main bearings would sit in. In the picture you can see light shining through the hollow pins. So the oil being sent to the front main bearing section to twist the prop and control rpm was not able to hold the oil pressure due to the hollow pins. Instead, the oil was leaking back into the crankcase, according to how Allen explained it to me.

lr172 · #15 07-01-2018, 07:43 PM

That's interesting. I thought those were the pins you were referring to. However, I think the pin on my 320 (I only remember one on the 320) were hollow and I remember thinking they must be the source of oil for that bearing and ultimately the internal nose of the crank / prop. That engine was an FP, so have no idea if maybe that was a problem.

Thanks for posting.

Larry

Quote:

Originally Posted by miyu1975

The pins are located where the front main bearings would sit in. In the picture you can see light shining through the hollow pins. So the oil being sent to the front main bearing section to twist the prop and control rpm was not able to hold the oil pressure due to the hollow pins. Instead, the oil was leaking back into the crankcase, according to how Allen explained it to me.

BillL · #16 07-01-2018, 08:13 PM

Glad to hear you got to the bottom of this. I was trying to sort a prop speed issue and talked to Allen a couple of weeks ago about running the prop leak test. He mentioned he just had this experience as an example, no details, just something about the dowel.

A little disappointing to hear a quality outfit had this happen, but good they covered it.