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02-01-2010 06:33 PM  8 years agoPost 1
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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Has anybody taken one of these things apart yet? I just picked one up, but the piston is damaged from a locking tool. If I'm going to tear it down, and rebuild, are there any other parts I should order along with the piston itself? Consumables that might break during the rebuild? Gaskets, etc?

Should I replace the ring and sleeve while I'm at it? The motor is still pretty new, so I'm not sure it's necessary. Suggestions anyone?

If it can't hover, it ain't worth flying.

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02-01-2010 09:53 PM  8 years agoPost 2
Nelson J

rrApprentice

Canada

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Once I had to opened one of my gasser engine, while it was all apart I replaced the cheap bearings.

Bit by Bit

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02-01-2010 11:35 PM  8 years agoPost 3
Dilbeck

rrElite Veteran

Springdale Arkansas

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just picked one up, but the piston is damaged from a locking tool
Must have been cheap, Some of you guys that purchase used and start asking questions about/or how to do a rebuild worry me. If you dont mind me asking what was the difference from what you paid for said engine from a new in the box with warranty??

Clint

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02-01-2010 11:40 PM  8 years agoPost 4
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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Actually I was asked to keep the specifics between myself and the seller, and I intend to honor that request. I was well aware of the condition of the motor when I bought it, so no worries there. Suffice to say the deal I got was worth the little bit of work I'll have to put into the motor.

The piston is on backorder already, was just wondering if there's going to be any surprises when I start actually taking it apart.

If it can't hover, it ain't worth flying.

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02-02-2010 12:51 AM  8 years agoPost 5
Dilbeck

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Springdale Arkansas

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Actually I was asked to keep the specifics between myself and the seller, and I intend to honor that request.
Good answer due to your feeling bad about the purchase now. Good luck and I wish you well on your rebuild.

Clint

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02-02-2010 01:03 AM  8 years agoPost 6
nowinkk

rrNovice

LandBelowTheWings

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Has anybody taken one of these things apart yet? I just picked one up, but the piston is damaged from a locking tool. If I'm going to tear it down, and rebuild, are there any other parts I should order along with the piston itself? Consumables that might break during the rebuild? Gaskets, etc?

Should I replace the ring and sleeve while I'm at it? The motor is still pretty new, so I'm not sure it's necessary. Suggestions anyone?
If I were you, I would replace the piston along with the piston ring. The gaskets need to be replaced too. I dont think there is a sleeve, but if the cylinder block has been worn out, replace it as well. The bearing is cheap if you can source it locally and might as well change it.

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02-02-2010 01:03 AM  8 years agoPost 7
rotormonkey

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Ottawa, ON - Canada

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I'm not sure where you got that impression from. As I said, I knew exactly what the condition of the motor was going into it. I knew it would need to be rebuilt, and I was willing to do so. I still am. What makes you think I have buyer's remorse? I don't.

The reason this thread is here is not to complain about the condition of the motor I bought second hand, but to gather information I might need in rebuilding it.

Since I don't want this thread to get too far off topic, Dilbeck if you want to continue the conversation along this line, please PM me.

If it can't hover, it ain't worth flying.

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02-02-2010 01:59 AM  8 years agoPost 8
Dilbeck

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Springdale Arkansas

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Sorry, rotormonkey. I just got screwed by the Outback Steakhouse takeaway/drive through again. I ordered a loaded baked potato with my steak with all the fixens. They forgot the POTATO but sent all the fixens in a nice styrofoam container. I was just making a joke at your expense because I really wanted the baked Potato. Sorry and good luck with your rebuild, I was in a bad mood is all. No offence.

Clint

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02-02-2010 04:13 AM  8 years agoPost 9
jschenck

rrProfessor

La Vista, NE.

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I just did my first take apart/rebuild of my 26. I was concerned about how it would turn out but s far I'm glad I did. Before you order all those parts I'd suggest taking it apart and looking at the condition of everything. If the piston and cylinder are in good shape other than the hole being punched in the top then I'd say your cylider is worth keeping as there is a bit of money to replace that. Definitely replace the gaskets, it's only a couple of $$$'s.

I had to make a tool to get the magneto off and there is no safe way I can see to get the fan off without the special tool that Century sells. This is on a 26 not sure if that applies to a 20 or not. I think it's a EI engine? anyway, take it apart first so you know what you have is my thought.

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02-02-2010 10:36 PM  8 years agoPost 10
ChrisJ

rrNovice

MI

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...

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02-02-2010 11:37 PM  8 years agoPost 11
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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jschenck,

I suppose that's probably not a bad idea. I can see through the spark plug hole that the piston has a big pit right in the middle, so I'll definitely be replacing that. That's the whole reason I'm doing the rebuild. I'm not comfortable flying it that way. There can't be very much material left there.

As for the fan, I guess I just assumed that it twists off. What's not safe about removing it on the G20/26?

If it can't hover, it ain't worth flying.

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02-03-2010 01:24 AM  8 years agoPost 12
rccarguy

rrVeteran

Boston MA

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I can see through the spark plug hole that the piston has a big pit right in the middle
A pit or a hole? It's normal to see a "pit" or indentation in the top of a Zenoah piston, that's the way they're made, see the picture of a 231 piston below...

I could see exactly the same thing through the plug hole on the G20 now in my Radikal out of the box. Of course if the pit is bigger than what you see in the picture, then by all means take it apart and have a look...
As for the fan, I guess I just assumed that it twists off.
Not if it's a Radikal fan, it's keyed to the crank, you'll need a puller to get it off, a small two jaw will do the job.

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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02-03-2010 04:05 AM  8 years agoPost 13
jschenck

rrProfessor

La Vista, NE.

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EDIT: Does sound like you piston might be ok. Take it apart and check like suggested already, that's what I'd do.

I don't know about the 20 but on the 23/26 it's a tapered shaft and it's a *really* tight fit. I would not want to use a pulley wheel puller like that as it'd bet it'd bend the fan. The tool that Century sells is the only way I can see to safely remove the fan from the nose of the engine, along with a fair amount of heat.

http://www.centuryheli.com/products...tm?prtnm=CN2293

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02-03-2010 01:41 PM  8 years agoPost 14
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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Well that's good to know. He told me he'd damaged the piston, and I had a look, saw the pit, and didn't really think twice about it. Maybe there isn't as much damage done as I'd previously thought. I suppose this warrants another look then.

Thanks for the great info guys. And on the fan too. I suppose I'm gonna have to order me up a puller doodad.

If it can't hover, it ain't worth flying.

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02-03-2010 01:52 PM  8 years agoPost 15
rccarguy

rrVeteran

Boston MA

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Thanks for the great info guys. And on the fan too. I suppose I'm gonna have to order me up a puller doodad.
Check with Century first, I've had the Radikal fan on and off and I don't see how the tool shown would work with the Radikal fan. With the clutch screwing into the top of the fan, I see don't see how the tool would be attached, a phone call should clear that up before you order.

That said, I was able to pop the fan off with a 2 jaw and a longer bolt in the crank for the central stud of the puller to push against. If the fan asssembly was installed with gorilla force that method may not work without bending the fan as noted, I didn't overtighten on assembly, so it came apart without difficulty.

XCell Spectra G
Radikal G20
Some obsolete nitro helis too...

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02-03-2010 02:18 PM  8 years agoPost 16
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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No I don't believe that puller will work for the Radikal fan. Seems to require screw holes that don't exist (at least as I recall). Though by the sound of it a puller of some description will be required. I'll surf around the Century site and see what I can find unless one of you guys has the link to the doodad I need for the G20/Rad fan?

If it can't hover, it ain't worth flying.

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02-03-2010 03:10 PM  8 years agoPost 17
kaotik

rrApprentice

upper darby pa

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i heated my g20 up really good and just tapped with a small ball peen hammer just make sure you dont lose the little crescent shaped key when the fan comes off

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02-03-2010 04:05 PM  8 years agoPost 18
Billme

rrElite Veteran

MS

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I use a leather mallet, and position the key on the hub where the mallet hits right above the key, which raises or tilts on the key. Do not hit 90degs to the key .. I also heat the hub first..It doesn't take much if you didn't gorilla grip the 6mm bolt..

Bill

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02-03-2010 04:08 PM  8 years agoPost 19
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Just an idea
on the fan removal idea,if you fit the crank allen bolt with a sturdy washer above it and refit the clutch,can you then unscrew the bolt carefully to jack against the washer and clutch to remove the hub through the clutch centre(i am only assuming you have enough clearance to use this method).If indeed you have piston tool damage it would be worth checking the crank halves has not been twisted out of alignment,although it would need a fair amount of abuse to have done this.

Team- unbiased opinion.K.I.S.S principle upheld here

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02-20-2010 02:56 AM  8 years agoPost 20
rotormonkey

rrKey Veteran

Ottawa, ON - Canada

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Okay this is going to hold me up. My LHS says the replacement pistons for this motor are on back order and may stay that way for a while. Since I really don't know what it's SUPPOSED to look like, can you guys tell me whether I can fly this without blowing a hole through it?

Thanks!

Edit: Oh and I assume the carbon buildup there is normal? Should I remove it being as I have it apart already? If so, how?

If it can't hover, it ain't worth flying.

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