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"Cox Tee Dee .010"



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Lesson Learned. The Hard Way....

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Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 8:25 pm

So in my quest to clean up an engine for my airboat, I had to take my engine apart. I have done this before a few times and know what I am doing. Well, at least I thought so. So fast forward to removing the cylinder. Padded vise, proper Cox wrench, loosened it and put back on loosely. Put my prop screw in and again in the padded vise, began to press the thrust washer off. More resistance than I remembered. I removed it and looked it over. Thrust washer is off and spinning, but the crank was still not coming out the back. Then, and just then I realized I forgot to remove the cylinder and piston! DAMMIT! Yep, piston is broken just above where it mounts on the crank pin. So I just put some JB weld on it and will see if it holds. If not, I will be searching Cox's website for a new one. Anyways, I am just ranting now and wanted to share my experiences so others may NOT do as I had done. Have a good evening everyone, I know I wont.
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Re: Lesson Learned. The Hard Way....

Post  Jason_WI on Mon Jan 18, 2016 8:50 pm

JB weld wont hold. That sucks. What number cylinder is it? I assume it is an .049?
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Re: Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 8:56 pm

#3 cylinder, old Cox .049 product engine with white horseshoe backplate. Ok, thanks for letting me know it won't hold. Just thought I'd try before buying a whole cylinder/piston assembly. Kijiji here I come.
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Re: Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 8:58 pm

And now after this whole fiasco, I am scared to even clean the rest right now plus I do not want to leave it in the crock pot all night, so am waiting till tomorrow just to be safe.
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Re: Lesson Learned. The Hard Way....

Post  Jason_WI on Mon Jan 18, 2016 9:03 pm

was the #3 a step cylinder precision ground for a throttle ring?
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Re: Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 9:12 pm

Looks like it. I will get a photo in a couple of minutes.
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Re: Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 9:15 pm

Ok, here it is.
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Re: Lesson Learned. The Hard Way....

Post  Jason_WI on Mon Jan 18, 2016 9:21 pm

Do you have a throttle ring? I have a #3 stepped ground cylinder. I'm betting the crank pin is damaged too on the crankshaft.
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Re: Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 9:27 pm

Nada. Just the engine as it was without it. It was recently acquired in a trade. Thanks for letting me know about the cylinder. I was wondering why it had more of a 'polished' and slightly oxidized finish on it. I guess this is more of a bad thing than I had originally thought? Ruined a good engine? I will for the time being rob and use the cylinder and piston off of one of my Franken-Babe-Bee engines. Or could I get away with just using the piston? Just to get it going when it warms up here.
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Re: Lesson Learned. The Hard Way....

Post  NEW222 on Mon Jan 18, 2016 9:27 pm

P.S. Forgot to add. Thanks for the help.
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Re: Lesson Learned. The Hard Way....

Post  Jason_WI on Mon Jan 18, 2016 10:44 pm

Everybody has an oops. I'll send this to you along with the burnt heads you asked about a while back (sorry I forgot about that)

The engine has a sure start cylinder fitted with a Ace R\C throttle that can be used on other SS cylinders. I added a KB thrust washer so it won't wear out the case with an electric starter. Has a snap starter and TD spinner.

Gotta have a throttle on a air boat! Smile



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Re: Lesson Learned. The Hard Way....

Post  Oldenginerod on Tue Jan 19, 2016 12:01 am

NEW222 wrote:Nada. Just the engine as it was without it. It was recently acquired in a trade. Thanks for letting me know about the cylinder. I was wondering why it had more of a 'polished' and slightly oxidized finish on it. I guess this is more of a bad thing than I had originally thought? Ruined a good engine? I will for the time being rob and use the cylinder and piston off of one of my Franken-Babe-Bee engines. Or could I get away with just using the piston? Just to get it going when it warms up here.

I've swapped many pistons into their non-original cylinders.  Never had a problem.  As long a the piston isn't worn out, accuracy was so great on "most" Cox engines that swapping parts doesn't really pose any great problems.  When I destroyed my brand new piston I got for my Tach Race engine, I just scrounged around and found another one that looked unworn, re-set the rod, sent the engine to Kim and the darn thing won the Mouse class.  So no, it probably won't matter.
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Re: Lesson Learned. The Hard Way....

Post  fredvon4 on Tue Jan 19, 2016 9:13 am

New222

Don't know how many .049 engines you have but these days it is not a bad idea to watch the LOT sales on e-bay or other places and accumulate a fair collection of used parts

I got one such a lot that mostly was 15 different Bee engines all disassembled to some degree for $37....not enough total parts to make 15 complete engines though.

Combined with my stash of parts I managed to make up 11 complete ...so about $3.50 per engine

A trick or technique I learned on this site was from the Paul Gibeault mouse race engine set up

I took 15 cylinders and 17 piston rod assys not knowing what originally when with what. I cleaned them all squeaky clean then started pairing them up using Paul's method.... find the piston that will smoothly move to the top dead center and stick there on its own weight...and then tap the top of the piston lightly and see if it will fall straight out....after several of these trials you get a good feel for Piston and cylinder fit

I ended up with 9 well fit cyl/PC assembly that married up just fine with the many versions of crank case and tank /back plate...ran each one, cleaned and over the years have gifted most of them to folks all around the world

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Re: Lesson Learned. The Hard Way....

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