Broken bolt stuck in prop hub

Airboat propeller discussion.
Andrew511
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Joined: Mon Oct 23, 2017 9:52 am

Broken bolt stuck in prop hub

Postby Andrew511 » Mon Feb 11, 2019 6:57 pm

I have a 2 blade WW prop Held on by a 4 bolt hub. All bolts had nuts on the back and it’s a smooth bore bolt hole. 3 bolts loosened up and came out no problem. One bolt would not budge I was able to get the nut off the back no problem but ended up snapped the bolt head off flush with the hub. Even with the bolt head and other 3 bolts out the hub is fuzed solid to this bolt and won’t allow me to take the front plate ooff the hub. Any suggestions? I imagine drilling it out is no easy task

unforgiven11B
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Re: Broken bolt stuck in prop hub

Postby unforgiven11B » Mon Feb 11, 2019 8:27 pm

Use a punch. You say the nut is off and smooth bore hole, mix power steering fluid and acetone 50/50 and use it as a penetrating oil. Had hub bolt on last boat same deal but corrosion held the bolt Tight soaked it for over night hit it with air hammer and pushed it out from the backside.

hdsadey
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Location: venice fl.

Re: Broken bolt stuck in prop hub

Postby hdsadey » Mon Feb 11, 2019 8:28 pm

PB Blaster and a little heat. Propane torch so not to cook the carbon. The heat will suck in the Blaster as it cools. Take a brass drift and a hammer and try to drive it through til it passes the split. When going back together use some kind of anti-seize.
02 Predator 12' 0320 Lycoming
92 Big O 13' 302 Ford DD
99 Donzi 16 Classic 350 Vortec

Gary S
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Re: Broken bolt stuck in prop hub

Postby Gary S » Tue Feb 12, 2019 7:14 am

Good air hammer is better than drift if you have one. Many little short hard hit jars a lot of things loose. Would soak it as stated earlier.

hdsadey
Southern Airboat Member
Posts: 171
Joined: Sun Jul 01, 2012 7:42 pm
Location: venice fl.

Re: Broken bolt stuck in prop hub

Postby hdsadey » Tue Feb 12, 2019 3:25 pm

I agree on the air hammer. Don't like mushrooming the shank any more than necessary so it doesn't swell in the bore, hence the brass.
02 Predator 12' 0320 Lycoming
92 Big O 13' 302 Ford DD
99 Donzi 16 Classic 350 Vortec

SeatCover
Southern Airboat Member
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Joined: Mon Nov 06, 2017 7:33 am

Re: Broken bolt stuck in prop hub

Postby SeatCover » Tue Feb 12, 2019 6:24 pm

Heat and candle wax.
12' Cut Gilleo, Angle Valve 0-320, 72" Whisper Tip. Goes wherever I point it. :florida:

Andrew511
Southern Airboat Member
Posts: 26
Joined: Mon Oct 23, 2017 9:52 am

Re: Broken bolt stuck in prop hub

Postby Andrew511 » Wed Feb 13, 2019 9:22 am

hdsadey wrote:I agree on the air hammer. Don't like mushrooming the shank any more than necessary so it doesn't swell in the bore, hence the brass.


So does the air hammer punch also need to be brass? And do I heat it then put the PB blast on it when it’s hot?

hdsadey
Southern Airboat Member
Posts: 171
Joined: Sun Jul 01, 2012 7:42 pm
Location: venice fl.

Re: Broken bolt stuck in prop hub

Postby hdsadey » Wed Feb 13, 2019 9:15 pm

Don't believe they make them in brass. If your gonna use an air hammer just be gentle. If you go at it too hard you might end up swelling the shank and make more work for yourself. Heat it a little and spray, it will draw the Blaster in. WD40 works too, Liquid Wrench, anything that is designed to bust up corrosion.
02 Predator 12' 0320 Lycoming
92 Big O 13' 302 Ford DD
99 Donzi 16 Classic 350 Vortec


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