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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › 700n fan hub
03-10-2012 09:29 PM  6 years agoPost 1
shiver

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Ireland

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I'm changing bearings and can't get the fan off. Any ideas please. It's as tight as hell. Thanks

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03-10-2012 11:58 PM  6 years agoPost 2
MXRACERX43

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Hazleton,PA USA

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Apply some heat with a heatgun/ small pen torch.

Team Miniature Aircraft~Team GensAce

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03-11-2012 12:00 AM  6 years agoPost 3
Dood

rrProfessor

Wescanson

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Helps to have a crank locking tool, too.
http://www.fast-lad.co.uk/store/cra...22y-p-6322.html

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03-11-2012 12:10 AM  6 years agoPost 4
MXRACERX43

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Hazleton,PA USA

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Helps to have a crank locking tool, too.
Agreed, they are a must.

Good call Dood I was assuming he was using one.

Team Miniature Aircraft~Team GensAce

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03-11-2012 01:54 AM  6 years agoPost 5
BladeStrikes

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Shelby TWP,Mi

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Loosen the 2 allen bolts on the hub then take a flat head screw driver and tap 2-3 times between the gap's ..Stick a plastic tooth brush behind the rod and turn the crank until the tooth brush is locked between the rod and block..Put a rag over the fan and turn like hell and pull at the same time..Put a little oil or something in the gaps of the fan hub so it makes it easyer to spin..Them hubs are a pain it the azz getting off..

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03-11-2012 03:06 AM  6 years agoPost 6
dchekas

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Farmington, CT

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Remove the piston and liner from the engine.

Place it so the backplate is down on a table. Use a hammer and punch, and tap the crank shaft out.Couple hits and the fan hub should loosen up.

You need to remove the crank shaft to change the bearings anyway.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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03-11-2012 03:16 AM  6 years agoPost 7
MXRACERX43

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Hazleton,PA USA

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You dont want to hit your crank shaft with anything.

Apply heat as mentioned and with a locking tool it will come right off.

Team Miniature Aircraft~Team GensAce

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03-11-2012 04:21 AM  6 years agoPost 8
dchekas

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Farmington, CT

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As long as the piston/connecting rod is removed, I don't see the problem.

It shouldn't take a huge hit to break it loose.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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03-11-2012 04:28 AM  6 years agoPost 9
MXRACERX43

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Hazleton,PA USA

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The hubs can really get stuck on the 700N's. The easy, safe way is a little heat.

Bangning on any engine component is a bad idea and especially a crankshaft.

Team Miniature Aircraft~Team GensAce

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03-11-2012 08:00 AM  6 years agoPost 10
shiver

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Ireland

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Thanks guys. I'll go for the heat option first. No ways it's coming off on it's own. I presume same method for the main shaft bearings.

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03-11-2012 08:20 AM  6 years agoPost 11
MXRACERX43

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Hazleton,PA USA

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Remove your carb and any seal/o-rings. Pop it in a toaster oven on 300 for a few minutes. The Bearings will fall right out, or give it a tap on a block of wood.

Heat the case again when you install the new ones.

Team Miniature Aircraft~Team GensAce

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03-11-2012 10:09 AM  6 years agoPost 12
shiver

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Ireland

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Is the hub threaded on? Heat helping a bit but it's turning slightly but not coming off. Apply more heat?

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03-11-2012 10:15 AM  6 years agoPost 13
shiver

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Ireland

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Turning now but not coming off. Stripped?

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03-11-2012 10:18 AM  6 years agoPost 14
shiver

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Ireland

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Off now. Thanks guys. Extra bit of heat did it

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03-11-2012 09:00 PM  6 years agoPost 15
Glenn Goodlett

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California

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Or get a fan hub puller. Precisionhelitools.com sells a nice one.

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03-12-2012 03:13 AM  6 years agoPost 16
Four Stroker

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Atlanta

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Apparently nobody uses fan hub pullers anymore.

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03-12-2012 03:32 AM  6 years agoPost 17
Dood

rrProfessor

Wescanson

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Most fan hubs on new kits seem to be threaded on these days. The 700n is just one exception.

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