djmp69

Prop bolts got sheared off, I got lazy and didn't check the bolts and the wood compressed and the bolts got loose. Trying to remove the hub to replace it. On the DLE 55 it's easy, theres a little flange on there I can just use my pullers, and it pops right off. On the 85, no flange, just straight down to the crankcase. I've removed the two set screws. The thing just won't come off. I even put a torch to it to warm it up a bit. No joy. Am I missing something, is there a trick to this? I reall don't want to damage the crankcase or sensor, any ideas?

tcrowson

How many of the bolts are sheared? It may be possible to back the broken bolts out without removing the hub.If you have access to a machinist they should be able to help you.
Good luck
Tas

ForcesR

There is a prop drive hub nut that has to be removed. Look straight down the center of the hub you will see the nut on the shaft. you will need a deep socket to remove it. See parts link, it's item # 2 page # 22. http://manuals.hobbico.com/dle/dleg0085-manual.pdf Here is some good info on removing the hub nut. https://www.flyinggiants.com/forums/...d.php?t=220860

djmp69

As you can see in the photo, they are all sheared at the hub, so no gripping them.

djmp69

As you can see in the photo, the prop shaft has been removed already, that was a no brainer, nothing a 13mm deep socket couldn't fix. That is the issue, I have already removed everything that is securing the hub. Only thing left is good ol friction and the factory applied service removeable loctite.

I really didn't want to have to take off the engine and go thru all that drama, but if I cant find pully pullers to fit between the hub and the crank case, I'm going to have to find someone who can drill in some anti thread screws so I can screw them out, or disassemble the engine to some degree and stick it in the oven. Even then, no guarantees so I was just wondering if anybody had some cool trick before I went old school.

djmp69

Finally got it. I just put the torch on it a little bit longer at a low setting, and went around the entire thing so as to even out the heat. It eventually popped free with a tiny bit pressure from a really wide blade flathead screwdriver.

Whew!

Truckracer

My Feedback: (19)

Did the magnet survive the heat?

djmp69

probably not. I have a new hub coming, so my main concern was getting the hub off. I probably wont be able to drill out the broken bolts anyway.

tcrowson

The bolts are most likely too hard to drill out anyway. Unless they are locktited in a little careful work with a Dremel and either a diamond or carbide burr should cut a slot or ledge to enable them to be backed out.
Tas

djmp69

I thought about that, but after the heat, I wouldnt have good faith in the magnets performance, it's most likely compromised. I'm gonna test it, but first see if I can even get the volts out just for kicks.

djmp69

The magnet survived. Still strong. Consistent spark. Now for the hard part. Got one loctited bolt out, 5 more to go. ..

Truckracer

My Feedback: (19)

Loctite on prop bolts? Why?

djmp69

Just something I've always done. I know alotta people say dont do it, but a lil extra security doesn't hurt. Well, except in cases like this, lol, they're hard to get out now.

Truckracer

My Feedback: (19)

I know a sometimes controversial subject. But prop bolts are a maintenance item that need to be checked from time to time. When people use loctite, they tend to not check them thinking they will stay tight. Then the prop compresses over time leaving the bolts holding little compression on the prop hub ..... then they break. Its a predictable cycle. I have never seen a prop bolt come loose if it was still holding compression on the prop hub. I just use hardened flat washers between the bolts and the prop hub washer. I replace the original bolts if their grade is not known.

djmp69

Indeed, I hear and read people saying that all the time. That's usually true for people who dont do proper maintenance anyway. Never been a problem for me tho. This time it just happened sooner than my check as I got lazy/lax in checking things over. First time for everything, lesson learned. Then too, I dont goop it on, just a drop. That and some good ol fashioned split lock washers.

djmp69

Hey, what bolts do you use?