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HelicopterEngines Plugs Mufflers Fuel › fan/hub remove...
08-10-2017 12:33 AM  14 days agoPost 1
UKhelinoob

rrApprentice

Michigan USA

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Guys I have this TT 70 (Which I have stripped down), so I can do a full rebuild, But The bloody fan/hub is giving me a problem. I can't get it off... On other engines I normally tap the crankshaft and it drops through the other end. However on this engine it won't budge. What's the trick to pull it off Please..

Oh, I don't know that heli it came out of. Because I bought it off eBay..

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08-10-2017 12:59 AM  14 days agoPost 2
JuanRodriguez

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The Villages, Florida

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Go look at your original thread for the answer.....

Been there, done that and old enough to know better.....

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08-10-2017 02:56 AM  14 days agoPost 3
UKhelinoob

rrApprentice

Michigan USA

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Ok. But I figured it out. I cut off the plastic fan and it was screwed on, so I just used a wrench and unscrewed the hub. Putting a screw driver down the carb inlet and trying it by hand was no good. Had to cut the fan off..

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08-10-2017 03:30 AM  14 days agoPost 4
EEngineer

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TX

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" Putting a screw driver down the carb inlet and trying it by hand was no good."

Won't that damage things using a screwdriver.

A wooden dowel wouldn't ding the metal in the carb inlet as a hard metal screwdriver might.

Logo 600SXs, 700XX, 800XX

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08-10-2017 12:46 PM  13 days agoPost 5
JuanRodriguez

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The Villages, Florida

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You got it figured out ???? Too bad you didn't listen to my initial advice before deciding to hack things up ...... that's a waste of a perfectly good fan/hub !!! Folks are looking for Raptor parts all the time .....

And a screwdriver down the carb inlet to lock the crank ??? Really ????

Best option is to use a nylon crank lock tool to lock the crank through the BACK of the motor......a wooden dowel or plastic toothbrush as I suggested would be the second best choice short of having the proper tool.....

But hey , it's your motor to destroy as you see fit ....

Been there, done that and old enough to know better.....

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08-10-2017 05:33 PM  13 days agoPost 6
UKhelinoob

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Michigan USA

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Well I've never damaged a crankcase by using a screwdriver (I put tape around the screwdriver first). Anyhow, The fan/hub was no use to me as I'm putting the engine in my vintage heli.. Motor not destroyed. Now I can rebuilt it (darn I've got too many hard to find new parts for the TT 70, as a example 4 piston rings, 2 sleeves , 3 crankcases, bunch of bearings, and more ect... I do have 3 complete motors (All stripped down now)..

Oh one motor is going in my HPI Savage truck (Custom made 4mm thick motor plate.. You should the new red head that I bought. It's as large as a beer can (I have 2 of them)...

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08-10-2017 05:49 PM  13 days agoPost 7
EEngineer

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TX

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"I put tape around the screwdriver first"

Tape is even softer than any metal....that's why wooden dowels come in so handy....

Logo 600SXs, 700XX, 800XX

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08-10-2017 05:52 PM  13 days agoPost 8
UKhelinoob

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Michigan USA

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I bet a wooded dowel wooden would break in half...

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08-10-2017 05:56 PM  13 days agoPost 9
EEngineer

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TX

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Depends on how much force is used to make the screw break....

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08-10-2017 06:08 PM  13 days agoPost 10
UKhelinoob

rrApprentice

Michigan USA

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Well on this motor... The fan/ hub was screwed on so tight I couldn't undo it by hand (Nut was removed) . But I normally use a tooth brush. But me wife wouldn't let me use her tooth brush, so I had to use a screwdriver instead...

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08-10-2017 06:41 PM  13 days agoPost 11
EEngineer

rrElite Veteran

TX

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Toothbrush is a good idea, too.

You just want to avoid "nicking" the metal at all costs....

Shoot, just buy her a new one....where are her priorities?....

Logo 600SXs, 700XX, 800XX

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08-10-2017 07:48 PM  13 days agoPost 12
JuanRodriguez

rrElite Veteran

The Villages, Florida

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If you're gonna mess around rebuilding motors , etc, it pays off in the end to have the proper tools to do the job without damaging the motor ..... here is a crank lock tool I made years ago copied from a commercially made tool ..... of course , if you didn't know the fan/huh was screwed on well..... then you're "screwed" so to speak .

Hopefully you didn't damage the bearings by pounding the crankshaft with a hammer in attempting to remove the hub !!

Been there, done that and old enough to know better.....

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08-10-2017 09:07 PM  13 days agoPost 13
EEngineer

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TX

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Nice, what's it made of....Delrin?

Logo 600SXs, 700XX, 800XX

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08-10-2017 11:59 PM  13 days agoPost 14
JuanRodriguez

rrElite Veteran

The Villages, Florida

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Yes..... a good machinist friend who worked at Delphi at the time (now retired) was a great source for material, tooling and machine work whenever I needed it. In return , I fixed his small engine stuff..... snow blower , mowers , etc

Been there, done that and old enough to know better.....

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08-11-2017 12:11 AM  13 days agoPost 15
EEngineer

rrElite Veteran

TX

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Cool...delrin's good stuff...

Logo 600SXs, 700XX, 800XX

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08-11-2017 03:26 AM  13 days agoPost 16
kglassman

rrApprentice

Phoenix Arizona USA

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fan hub removel tool

I have two (2) delrin crank lock tools made by miniature aircraft, you have to take off the back plate, line up the con rod and slip in the tool and twist off the fan! using this tool saves everything without breaking, bending or buggering up any parts.

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08-11-2017 11:42 AM  12 days agoPost 17
JuanRodriguez

rrElite Veteran

The Villages, Florida

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The one I made was copied off the Miniature..... The Delrin was free

Been there, done that and old enough to know better.....

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