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HelicopterBeginners Corner › Broke my piston with toothbrush.
12-18-2003 03:40 PM  13 years agoPost 1
RCHELIFANATIC

rrApprentice

TEXAS

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I was putting clutch on and I threw out my cylinder stopper that screws into the head because of all the stories of it causing damage.

I stuck the end of the tooth brush in between connecting rod and block.
But this time I did it on the down stroke, piston came down and broke bottom off.

Anyway now that I am replacing the piston what else should I replace?
Engine only 4 gallons old, and in great shape.
Do I need a new ring, or can I use old one?

NOOBS, watch out for this.


Thank you

also what is the best way to get the sleeve out so I can get the con rod off crank?

AMA 869729 Raptor 30v2

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12-18-2003 03:56 PM  13 years agoPost 2
Jim C

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PA

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i would replace the piston, rings, and liner.. just to be sure. that sucks.. i trashed my liner taking it out.. im not sure how to get it out.. i used a soft piece of plastic to lift it out by the ports.. but not thinking, it bent the metal in.. now the rings get caught on the burrs ..

jim

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12-18-2003 04:14 PM  13 years agoPost 3
James Yeram

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Oceanside, CA

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your not the only one.
i stuck a toothbrush in the exaust port to tight the fan down.
hehehe
and it wasn't my engine to boot.
its all fixed though

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12-18-2003 04:19 PM  13 years agoPost 4
rickc

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Creve Coeur IL. (Peoria Area)

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Most that use a toothbrush pull the carb off and stick the toothbrush in the crankshaft intake port. I have used a piston locking tool in the past without problems but I was always very careful and also used a towel wrapped around the fan to take most of the load off the piston. Since then I have purchased a nylon crank locking tool. This is used by removing the backplate for access. It's a great tool to have it will fit a 30 and a 50 on one end and then turn it around for a 61 and a 91. Bought mine from Rick's

Rick

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12-18-2003 04:44 PM  13 years agoPost 5
Wisdom-Seeker

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Danville, CA

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If you haven't got a piston lock,

I find that removing the backplate and stuffing a rag into the crankcase works reasonably well as a piston lock, and the rag is too soft to bend or scar any metal. Sometimes, however, it is hard to remove the rag.

--

Wisdom-Seeker
Protest letter to insurance co.: What do you mean "Act of God"?

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12-18-2003 04:50 PM  13 years agoPost 6
flipped2left

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indianapolis,in.

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well................(flame suit on) i remove the head from my o.s. 32 put the piston at t.d.c. lay a penny on top then put the head back on .so far so good. i also hold the fan with a towel. then of course i remove the penny. ken

Smile! people will wonder what you're up to!!

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12-18-2003 05:02 PM  13 years agoPost 7
Kinger

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Granville, OH

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I've done that with not just one, but TWO of my freaking engines. You can bet I won't be using that method ever again. I've found that the toothbrush down the carb barrel (once carb has been removed) works great and you don't have to worry about damaging anything. I tried to purchase the crank lock through Rick's just to give it a try, but they were all out of them. That was about a month ago though.

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12-18-2003 07:27 PM  13 years agoPost 8
Mr_Magoo

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Nevada

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I remove the piston/conrod assembly. Then, I use the toothbrush between the crankpin and crankcase. Leaving the connecting rod on the crankpin would cause the conrod bushing to be loaded. We must have wimpy toothbrushes here. Everytime I use the carb hole it chops off the brush with very little torque. Removing the piston/conrod assembly is extra work. But to me, it's worth it.
also what is the best way to get the sleeve out so I can get the con rod off crank?
Put the piston at BDC. Stick your work hardened grizzely adams finger against the top of the piston and the exhaust ports. Rotate the crank. You can use gloves (I guess) if'n your hands aren't manly. Sometimes you've got to stick a toothbrush handle in the exhaust port and use a small screw driver as a fulcrum to get her going. Obviously, you don't let the screwdriver touch the cylinder liner.

Magoo

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12-18-2003 08:01 PM  13 years agoPost 9
RCHELIFANATIC

rrApprentice

TEXAS

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Thanks guys.

I wish I would have heard about this sooner.


Thanks

AMA 869729 Raptor 30v2

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12-18-2003 08:06 PM  13 years agoPost 10
greger

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Mesa, AZ

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Use the intake port with the toothbrush I can't imagine the toothbrush breaking when used this way.

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12-18-2003 08:06 PM  13 years agoPost 11
rcadd1ct

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Richardson, Texas

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To get the liner out just use a heat gun to heat the block. The liner will slide right out.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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12-18-2003 08:33 PM  13 years agoPost 12
shuttlepilot

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Mullins, South Carolina

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Punched a hole in the top of my piston with a locking "tool" also. Engine has less than 2 gallons through it. I'll be using the toothbrush method in the carb hole from now on. I also use a rag to hold the fan, but you have to make sure you don't snap the fan into pieces too.

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12-18-2003 10:18 PM  13 years agoPost 13
cmdiduca

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Mt. Pocono, Pa

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I used to use the piston lock, and have occasionally used the toothbrush in the carb slot. Now we have the plastic crank locking tool from Rick's part number JH6 i think. Best thing to use.
Chris

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12-19-2003 12:35 AM  13 years agoPost 14
gyan

rrKey Veteran

Surrey, BC Canada or Blaine Wa.

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All I've ever done is put the piston at BDC then fill the cylinder with cotton string tru the glow hole, crank her over till she locks. That way you don't have to remove the head (if you don't have to) and the pressure is even over all the piston. (that's what happens during combustion anyway!)

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12-19-2003 12:40 AM  13 years agoPost 15
Wisdom-Seeker

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Danville, CA

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The real problem with using anything to press on the piston head is that you run the risk of bending the connecting rod. This happened to my son, who did not find out until later why his engine was not developing any power. Once he replaced the connecting rod, his engine power returned.

--

Wisdom-Seeker
Protest letter to insurance co.: What do you mean "Act of God"?

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12-19-2003 08:41 PM  13 years agoPost 16
SPB

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Athens - Greece

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In raptortechnique.com there is a very clever idea for a home made tool for this purpose.
It's not necessary to remove anything or stick any toothbrush nowhere.
Here is the link
http://www.raptortechnique.com/fanhubtool.htm
What do you all think? Isn't it a good idea or there ia something wrong with it?

Sotiris

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12-19-2003 10:00 PM  13 years agoPost 17
rcadd1ct

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Richardson, Texas

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I don't think that will work with threaded on hubs.

It won't allow you to tighten the hub on the crank shaft.

If the hub was key type the method shown would work.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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12-20-2003 02:07 AM  13 years agoPost 18
mirsign

rrNovice

jacksonville, nc I WAS BORN TO TEACH YERAM TO SPEL

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TOOTH BRUSH

hey yeram your tooth brush had an indentation just like a screwdriver........imagine that!!

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12-20-2003 07:02 PM  13 years agoPost 19
Jagboy69

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Miami

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ToothBrush belongs down the carb hole.....
All I've ever done is put the piston at BDC then fill the cylinder with cotton string tru the glow hole, crank her over till she locks
This will bend the fragile connecting rod too... This trick comes from the automotive world.. You will get away with this in a car, but not on an R/C engine

Jason /// Sceadu50/9chp WWW.Jagboy69.com

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12-21-2003 07:58 AM  13 years agoPost 20
debogus

rrApprentice

Beauklahoma,peoples republic of mexifornia,USSA

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yep me too
Tooth brush in da carb hole.
Lots of bad stories about blocking piston.
Dave

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HelicopterBeginners Corner › Broke my piston with toothbrush.
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