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All Forums >> RC Airplanes >> Crash & Rebuild >> Old MRC restoration project
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Old MRC restoration project - 7/10/2007 11:10:22 PM   
23rd_Fox



Posts: 26
Joined: 4/8/2004
From: Long Valley, NJ, USA
Status: offline 		Hi all,

I'm new to the hobby, but I'm very anxious to get up and running with it. I bought a Tower Trainer 40, but I've only lifted off for a second or two, but not at an AMA club. In retrospect, that was a stupid decision, because apparently the elevator wasn't airworthy. I epoxy'd it, and it should be fine for next weekend, but that's beside the point

I just bought an old Model Rectifier Corporation foam trainer with a little Enya brand .15 size engine that I saw on craigslist. It came with a couple of spare wings, a 4-channel Futaba AM radio + servos, a flight box with a bunch of crap (including a power panel, servo parts, glow starter, etc.). And was missing the Rx battery, although I'm sure my other plane's battery would work in it.

Anyway, I only paid 50 dollars for the whole package, and I think I got a decent deal even though I know I have a lot of work to do on it. I assumed the that the engine wouldn't work out of the box, and I was right: I squirted some fuel into it and clipped the glow ignitor onto it, but it didn't fire. I turned it upside down, flipped the prop, and it squirted reddish oil crap right out the side of the cylinder head

Turns out the head was loose, so I took the opportunity to partially disassemble it. I removed the muffler, the head, took the prop off and washed everything out with soap and water. I wiped it all down, put some after-run in it so it wouldn't rust, and let it dry the rest of the way on its own.

That evening, I put it back together and swapped out the glow plug with one that's known to work. I put some fuel directly into the shaft and it lit right up and spun for a second or two before running dry again.

Now, the problem I'm facing is that the throttle seems to be completely stuck! I tried sticking a little wooden skewer in and putting pressure on the opening, since it's set to idle right now, but it didn't budge. Any ideas on how to get this thing open?
       Post #: 1

RE: Old MRC restoration project - 7/11/2007 1:38:46 AM   
ckangaroo70



Posts: 2084
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline 		Heat it up with a heat gun, and that may help free the carb barrel. Once free, lube it up with some afterrun, and open and close it many times until it is working freely.

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RE: Old MRC restoration project - 7/11/2007 1:40:15 AM   
23rd_Fox



Posts: 26
Joined: 4/8/2004
From: Long Valley, NJ, USA
Status: offline 		Cool. I have no heat gun, would holding a soldering iron against it work?

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       Post #: 3

RE: Old MRC restoration project - 7/11/2007 1:44:40 AM   
ckangaroo70



Posts: 2084
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline 		I probally wouldn't use a soldering iron since the carb housing will actually expand before the steel barrel. You don't want to burn a spot in the housing. You might get lucky with a good hot hair dryer, but I doubt it. Maybe try a clothes iron, or maybe even a set of kitchen tongs and hold it high above an open flame on stove, but NOT to close. Of course I don't know your age, so get your parents permission before using the stove, or if you are older like me, than get your wifes permission before using her hair dryer or iron.LOL

< Message edited by ckangaroo70 -- 7/11/2007 1:45:53 AM >

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RE: Old MRC restoration project - 7/11/2007 1:54:33 AM   
23rd_Fox



Posts: 26
Joined: 4/8/2004
From: Long Valley, NJ, USA
Status: offline 		I'm 19, so young enough to screw up big time and old enough to know better.

I think I'll take it with me to the field next week; I trust your advice but I don't trust myself

Plus, it's looking like this plane isn't going to go up in the air anytime soon anyway; I just glued the entire tailpiece back on tonight, and the servos are a mess. I couldn't even get the radio Tx to charge... I guess I'll have to swap out my good radio every time I want to use this plane, if I ever get it back together.

But in the meantime, I have another question if you don't mind. There are little decorative stripes of monokote on my good plane, and they've begun to come off and just flap in the stream of the engine. Can I touch these up with a clothes iron?

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       Post #: 5

RE: Old MRC restoration project - 7/11/2007 3:10:34 AM   
ckangaroo70



Posts: 2084
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline 		You can probally get them back down with a clothes iron, but the easier solution is to use windex. Windex will actually activate the adhesive on the back of the stripes. You will have to clean the surface real good with windex, and than spray the stripes, and than you use a credit card to squeegie the stripes down. Let it air dry over night. Sometimes this trick works and sometimes it don't. It really depends on how much good adhesive is left on the back of the stripes, or how much oil has contaminated the adhesive on the back side of the stripe. If the windex don't work, than try using the iron since your surface will be clean from trying the windex trick first. If all else fails, than put a little CA glue, or even regular super glue on the end of a cotton swap, and brush a bit on the back side of the stripe and than stick them back on by using another clean cotton swab.

< Message edited by ckangaroo70 -- 7/11/2007 3:16:00 AM >

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RE: Old MRC restoration project - 7/11/2007 4:17:59 AM   
RC MANIAC119


 

Posts: 574
Joined: 11/3/2003
From: muskegon, MI, USA
Status: offline 		Just spray some WD40 down the throat...let it sit there a few minutes....then work it back and forth. That thing will be free in a few minutes...........
Don't use an Iron........or a stove..........I'm surprised someone did'nt recommend a BLOWTORCH!@!!

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RE: Old MRC restoration project - 7/11/2007 4:25:44 AM   
ckangaroo70



Posts: 2084
Joined: 10/3/2003
From: London Mills, IL, USA
Status: offline 		A small blowtorch would work as well! Seriously, if it is siezed bad, than heating it up is the trick to freeing it up. WD 40 is good stuff, but heating up engines with a heat gun is a common thing. I mainly fly Planes, but I also own a few nitro trucks, and a heat gun is essential for winter driving. Makes for easier starts. I think if you pose this same question in the engine forum that you will find that using heat is a common solution for freeing up seized engines or other moving parts like a throttle barrel. I suppose you would also oppose boiling an engine in antifreeze?

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RE: Old MRC restoration project - 7/11/2007 5:13:15 AM   
RC MANIAC119


 

Posts: 574
Joined: 11/3/2003
From: muskegon, MI, USA
Status: offline 		The problem is removing built up castor and dirt..which means it needs a cleaning....NOT A MELTDOWN!!

I totally agree with soaking...NOT BOILING....an engine in antifreeze. Makes them look real nice

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RE: Old MRC restoration project - 7/11/2007 3:52:02 PM   
Wild Foamy



Posts: 1006
Joined: 10/11/2006
From: Newbury, UNITED KINGDOM
Status: offline 		emerse it in a little bit of nitro fuel or thinners in an old tub or something and leave it for a few hours

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RE: Old MRC restoration project - 7/11/2007 4:30:49 PM   
waydown2low


 

Posts: 93
Joined: 3/19/2007
From: Guymon, OK, USA
Status: offline 		MMMMmmm! Marvel mystery oil works real nice to free up stuff and as a preservative. I pickled a saito 1.80 for two years in a non heated garage and when put back on a plane it started the first flick against back pressure just like the last time it was flown. The guy asked me what kind of fuel I was using cause it had a strange aroma All that is sticking your carb is probably old fuel residue so when it frees up you should be good to go. Good luck on the repairs.

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RE: Old MRC restoration project - 7/11/2007 11:49:40 PM   
23rd_Fox



Posts: 26
Joined: 4/8/2004
From: Long Valley, NJ, USA
Status: offline 		Thanks for all the suggestions, you guys are great.

And in a strange development, the glow plug actually works!

(in reply to waydown2low)
       Post #: 12

RE: Old MRC restoration project - 7/12/2007 12:23:57 AM   
Sir_Sparksalot


 

Posts: 15
Joined: 2/26/2003
From: Bloomington, IN, USA
Status: offline 		I have found that rubbing alcohol works great to clean out an engine or throtle body. I a pinch I have used denatured alcohol. Had an OS 25FX go in hard and had to clean out a bunch of wet mud. After I put it back together and back on the plane I was able to fly it the next day.
Hope it goes well for you! Give us an update when you get the bird in the air.

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       Post #: 13

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