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Newbie Question - Tee Dee 049 Babe_b10
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Cox Engine of The Month
September-2020
sosam117's

"Traded an electric charger for this "Complete" (original) Cox Thimble Drome Olympic .15 engine. Right corner is photo as received."



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Newbie Question - Tee Dee 049 Empty

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Newbie Question - Tee Dee 049 Empty Newbie Question - Tee Dee 049

Post  pyropupx36 on Wed May 06, 2020 11:35 pm

Hello Everyone, I signed up to the forum some time ago but posting my first request for help now. I bought a NIB Tee Dee 049 in the jewel case (circa 1974) some years ago off eBay but only decided to take the engine out and examine it today with hopes of running it. Engine was full of congealed oil and hard to turn over, so I carefully disassembled it and everything can be cleaned up I believe with some acetone and gentle brushing, but the one troubling thing I see is rust on the inside of the cylinder. Can someone advise how to best clean the rust without damaging the cylinder bore?  It is an un-run engine so the bore is without scores or other damage except for the rather extensive coating of rust.

Another helpful tip I could use is how to re-press on the prop driver onto the crankshaft at reassembly time. I pushed the crank nose out with a drill bit in my drill press without trouble but unsure how to do the reverse process.

Thank you all in advance for your help!!

 Gary
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Post  Jason_WI on Wed May 06, 2020 11:55 pm

0000 steel wool rolled in a cylinder and rotated only enough to remove the rust from the bore. If the rust is near the bottom then just insert the steel wool to cover the rusted area and avoid the top of the cylinder. If it’s surface rust you should be fine. If pitted then probably toast.

Use a short hex head 5-40 prop drive screw and an old prop to pull the drive plate back on the crankshaft. Don’t forget the thrust washer. Using the slotted screw your risk slipping off and scratching the engine or perforating your hand.
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Post  balogh on Thu May 07, 2020 12:13 am

I could clean light rust off the cylinder once with cotton ear buds drenched in nail polish remover (acetone) .

If you use steel wool or similar, pay attention to what Jason advised: apply circular motion but never push/pull the steel wool along the cylinder axis so that any occasional micro- scratch should occur tangentially and not in longitudinal direction on the cylinder wall. This latter may destroy compression.
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Newbie Question - Tee Dee 049 Empty hope u dint damage

Post  davidll1984 on Thu May 07, 2020 6:53 am

use water wit javel la parisienne bleach rust wil disolve without damage mutch cylinder
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Newbie Question - Tee Dee 049 Empty Thanks for the tips

Post  pyropupx36 on Fri May 08, 2020 10:50 am

Thanks everyone for the helpful tips. I was able to remove almost all of the rust with the cotton swab and acetone method, and my eyes aren't good enough anymore for me to see if there are any pits or not on the cylinder wall.

Upon reassembling the engine it seems to have very good compression and flips over freely, so the next step is to try running it. I'll report back after I do.

 Thanks again.
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Newbie Question - Tee Dee 049 Empty It runs!

Post  pyropupx36 on Mon Jun 22, 2020 9:21 pm

Finally got a chance to run it - awesome!  Started in a couple of hand flips and ran steady for an ounce of fuel!  Thanks everyone for the helpful tips. There may be some rust damage in the bore but it still ran great - won't be a racing engine but that's not what I'll use it for anyway. It's probably been literally 48 or 50 years since I last ran a Tee Dee 049 - brought back some very fond memories. Thanks again.
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Post  sosam117 on Tue Jun 23, 2020 6:33 am

pyropupx36 wrote:Finally got a chance to run it - awesome!  Started in a couple of hand flips and ran steady for an ounce of fuel!  Thanks everyone for the helpful tips. There may be some rust damage in the bore but it still ran great - won't be a racing engine but that's not what I'll use it for anyway. It's probably been literally 48 or 50 years since I last ran a Tee Dee 049 - brought back some very fond memories. Thanks again.

After you run it, don't forget to use after run oil to keep it from gumming back up and rusting.
I use zoom-spout turbine oil. You an get it at Ace Hardware stores (that is where I get mine).
It's a natural oil with no cleaning solutions in it.
Have used it for years to keep my engines in good condition.
Will keep your Tee Dee .049 from rusting and gumming up for years, if/when you put it back in it's case.

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