Holy cr*p
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UPDATE -- RV-7 engine failure, Emer landing, no damage/injuries
- Thread starter BLittleton
- Start date
Great outcome! As others echoed, I bet the crank dowel pin experienced fatigue and SB 475c wasn't properly accomplished. How many hors ago was the prop strike? Or when was the prop replaced?
Another reason for making sure those prop low pitch stops are set correctly (about 2650rpm static). Even if you tried to pull the prop back, in your case with no oil pressure, nothing would have happened, as you need oil pressure to coarsen the propeller. So don’t second guess that you didn’t do it.. wouldn’t have made a difference. Great job with the landing!
Another reason for making sure those prop low pitch stops are set correctly (about 2650rpm static). Even if you tried to pull the prop back, in your case with no oil pressure, nothing would have happened, as you need oil pressure to coarsen the propeller. So don’t second guess that you didn’t do it.. wouldn’t have made a difference. Great job with the landing!
Very few "aircraft grade" bolts in Lycoming's. Most are Lycoming bolts, whatever they may be.
I was told at Lycoming school years ago that most of the external case bolts are simply Grade 2. Internal, highly-stressed “Jesus bolts” ….I only buy them from Lycoming because of…..superstition?
SB475c has you replace the bolt and locking plate but also inspect the dowel pin for signs of damage..
rocketbob
Well Known Member
Normal.
Well done, well written, and welcome to the club
Thanks very much much for your feedback, I hope we can all learn something from it
skylor
Well Known Member
1. See post #50 in this thread regarding counterfeit "KS" fasteners.
2. The correct Lycoming crank-gear bolts have a flat head face with the 4 digit Lycoming part-number stamped on them.
Skylor
thanks. didn't know that and missed that post.
I was told at Lycoming school years ago that most of the external case bolts are simply Grade 2. Internal, highly-stressed “Jesus bolts” ….I only buy them from Lycoming because of…..superstition?
I just looked at my core 540 in the garage and all of the screws I can see have the 6 lines for a grade 8 screw and "LE" in the middle. This was a factory rebuilt engine from ~15 years ago.
Interesting. Just bought one for an O-360-A1A and it is a STD-2213, now superceded by STD-2246. That is for the smaller 5/16 bolt on the non CW crank
Great job getting down in 1 piece. Everything else going forward can be fixed. From what you have discovered so far my opinion is you have to overhaul this engine. Who knows what other corners may have been cut. If you want confidence (and you do) that its put together correctly you going to have to go down to the last bolt. Good luck.
Don Broussard
Older A&P/IA/ATP
RV9 Rebuild in Progress
57 Pacer
Don Broussard
Older A&P/IA/ATP
RV9 Rebuild in Progress
57 Pacer
