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Scorpion Power GLOBAL 3D
HelicopterMain Discussion › O.S. crankshaft lock?
06-03-2013 03:53 AM  4 years agoPost 1
James Allen

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South West, OH USA

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I have a O.S. .91 HZ-R, and was wondering if this crankshaft locking tool will work, or not? Can't seem to find one labeled for the .91's.

It says for .32-.61. I have no experience with a .61, and didn't know if it was the same size engine case, and crank as a .91?

Thanks

http://www.experiencerc.com/store/7...-61-p-4276.html

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06-03-2013 03:56 AM  4 years agoPost 2
Dr.Ben

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Richmond, VA, USA

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It'll work.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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06-03-2013 03:56 AM  4 years agoPost 3
jschenck

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La Vista, NE.

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that'll work for the 91 - but honestly I prefer to use a tooth brush handle to lock the crankshaft in place. I broke a piston once with a crank locking tool that slipped when I was tightening down the fan nut.

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06-03-2013 04:09 AM  4 years agoPost 4
James Allen

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South West, OH USA

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Thanks for the replies guys!! Much appreciated

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06-03-2013 04:11 AM  4 years agoPost 5
RayJayJohnsonJr

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Midwest

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+1 on the tooth brush. It will stress your engine less than anything advertized as a crank lock.

There, their and they're. It's really that simple.

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06-03-2013 01:30 PM  4 years agoPost 6
Ace Dude

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USA

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I've been using the crank lock tool since they first became available in the mid/late 1990s. They've always worked great for me.

It appears the damaged piston was caused by using the crank lock took with the piston at TDC. The tool should be used with the piston at BDC.

  

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06-03-2013 02:30 PM  4 years agoPost 7
jschenck

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La Vista, NE.

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actually it was a BDC. The crank/con-rod moved/slipped from the groove of the locking tool just enough for the piston skirt to dig into the tool.

The white plastic one may be better since it's a harder material and is less likely to give, I'd guess. A tooth brush jammed between the case and the crankshaft seems to provide the most positive lock for me. To be fair I used that piston locking took many times, mostly on my 50's without problems.

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06-03-2013 02:47 PM  4 years agoPost 8
MartyH

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USA

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I like the lock tools. I have had one slip before. I might try the toothbrush next time just to see. How do you use it?

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06-03-2013 03:59 PM  4 years agoPost 9
jschenck

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La Vista, NE.

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Put the end between the crankshaft and the case so that it locks the crank. Hard to describe in words but it should be pretty easy to see once you try it. The other way is to pull the carb off and put the tooth brush in the crankshaft from the carb throat. I'll see if I can put a picture together.

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06-03-2013 05:36 PM  4 years agoPost 10
MartyH

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USA

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I get the carb throat but can't visualize the jamb the crank to the case position.

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06-03-2013 07:42 PM  4 years agoPost 11
Brokenlink

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Oakdale

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Jamie Griffith

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06-03-2013 08:18 PM  4 years agoPost 12
jschenck

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La Vista, NE.

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^^^ thanks - that's it.

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06-04-2013 12:01 AM  4 years agoPost 13
fla heli boy

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cape coral, florida

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I always went in thru the carb hole. Didn't like putting any kind of stress on the crank/rod pin. Just MO.

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06-04-2013 12:34 AM  4 years agoPost 14
BladeScrape

Senior Heliman

Warren OH. US

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I've used my wife's toothbrush lots of times for a locking tool .

Team JR

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06-04-2013 02:00 AM  4 years agoPost 15
Ace Dude

rrProfessor

USA

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The one time I tried the toothbrush in the carb slot I kept cutting the toothbrush in pieces.

I find mounting the engine in an engine mount and using the crankshaft tool the best option I've used.

  

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06-04-2013 02:37 AM  4 years agoPost 16
Brokenlink

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Oakdale

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Another choice you have is to use some fuel tubing or small rope like on the pull start of small engines.
You take out the glo plug,and move piston all way down then put some rope or fuel tube in hole then move piston to top. The rope will work as a piston stop as well.Better than the nasty piston locking tool that screws in where plug goes.

Jamie Griffith

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06-04-2013 02:41 AM  4 years agoPost 17
fla heli boy

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cape coral, florida

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bent rod??? Seen it happen on smaller engines...

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06-04-2013 02:47 AM  4 years agoPost 18
Brokenlink

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Oakdale

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bent rod???
were you using a cheater bar??? or just how small is SMALLER,like the cox .049? There are numerous ways of getting this done and you don't have to use a ton of muscle to do it.

Jamie Griffith

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06-04-2013 10:36 AM  4 years agoPost 19
3kidzheli

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columbia, ms usa

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I have one identical to that and it works for mine.

There is no such thing as up, it's all out...

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06-04-2013 01:58 PM  4 years agoPost 20
Four Stroker

Elite Veteran

Atlanta

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I broke a crank locking tool the first time I used it - $20. Now I just use 1/2 inch Delrin scrap.

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