912UL Issues

[68niou1]

Jim Scott (Aircore Aviation) when I called him said the exact same thing. So I am pulling the gearbox and shipping it off. I will keep everyone updated.

Thanks for all the input-

Scott

[SkyPirate]

this is also a common low rpm thing with the B box's on a 582 but its the spacers and springs on output shaft that is the culprit,..when you start getting allot of low rpm chatter out of the gear box,..time for rebuild

[68niou1]

I thought I would post the end result on this so maybe it might help someone else along the line later on- It turned out to be the gearbox, sent it out to Jim Scott at Aircore Aviation in Arlington, (great guy and highly recommended) got it back in record time(would have been faster but parts were back ordered) bolted it back up, retorqued everything, safety wired, fired up and she runs smooooth. no puking carb, no weird noises. And my plane only has 145 hours on it- so go figure.

[Av8r3400]

I have the parts in hand to do mine now too. I hope it works as well.

As a side note, what prop do you have? I have a 3-blade 68" warp with tapered nickel leading edges. 450 hours tt on the motor.

[Slyfox]

fantastic. when i left the airport last night I saw you going out the gate with your airplane in tow. I take it you went up to deer park with it. did you get a chance to fly it yet. I know a few years ago they complained of a rough engine and it kept the airplane from flying. glad you found the problem. what parts did they change out, very curious.

[Av8r3400]

After diagnosing with techs at LEAF they thought (for me) it is a problem with the Bellevue washers. These are cupped shaped washers that make up the spring that retains the driven gear in the gearbox, similar to the two stroke boxes.

I was sent these washers, the retainer half rings and all the lock washers and gaskets to do the install.

I'll take some photos of the job when I get to it, and post them here.

[Slyfox]

back when I had the early 912ul, I replaced those bevel washers because they wore so bad. Not sure if it ran smoother after ward, don't remember. It was a few years ago. with a press, it was a fairly easy job.

[68niou1]

fantastic. when i left the airport last night I saw you going out the gate with your airplane in tow. I take it you went up to deer park with it. did you get a chance to fly it yet. I know a few years ago they complained of a rough engine and it kept the airplane from flying. glad you found the problem. what parts did they change out, very curious.

Flew it this morning- spent about two hours in it running around the patch with no issues. Gonna spend a couple of days up in Deer Park til I get used to it then fly it back to my hanger at Felts. Felt great to get up in the air again- with all the issues I was beginning to question my purchase

[68niou1]

I have the parts in hand to do mine now too. I hope it works as well.

As a side note, what prop do you have? I have a 3-blade 68" warp with tapered nickel leading edges. 450 hours tt on the motor.

I will check it out and let you know- I have no idea other than it is a warp 3 blade non nickel leading edge. I know it pulls 5200 on climb out so I think its set about perfect from what limited knowledge I have gained-

[Av8r3400]

Here is a couple of photos of the rebuild process.