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Post  roddie Tue Dec 26, 2017 3:02 pm

These two engines share a peculiar "damage" between them. Both of them have damage to the bottom tank-vent. Huh...

Golden Bees from the Sturbridge trip... Dsc05145

I don't know their history. They were included in a bag of 10 "used" .049 engines.. mostly Cox.. but also a couple of Testors/McCoy rotary-valve engines.

One of the GB's had it's tank mounted 90 degrees from normal.. and the other had a Tee Dee glowhead installed.. Huh... Huh...

Both engines have #2 cylinders.. and the "standard" (Babe Bee size) air-intake.

Golden Bees from the Sturbridge trip... Dsc05146

Well.. I'd been wanting to further-inspect these engines ever since sourcing them.. so I took them apart this afternoon. What I found; surprised me a bit..

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Golden Bees from the Sturbridge trip... Dsc05149
Golden Bees from the Sturbridge trip... Dsc05150

That engine doesn't look like it's ever seen a drop of fuel..

Here's the other one.. not quite as clean.. but a LOT cleaner than I would have expected.

Golden Bees from the Sturbridge trip... Dsc05151
Golden Bees from the Sturbridge trip... Dsc05152
Golden Bees from the Sturbridge trip... Dsc05153

These engines both show "external" signs of being run. The gold anodizing is worn-off where the starter-spring contacts the nose of the crankcase.. and there are the tell-tale "scratches" of mounting-screws on the tank-anodizing.

One has a "tight-spot" in its cylinder-bore. I'll have to see if I can lap it out. It seems to be above the exhaust-ports though.. Huh...



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Post  Tee Bee Tue Dec 26, 2017 3:42 pm

If the vent tube is loose in the tank, some carefully applied J-B Weld should cure it.  I did that on a Black Widow some years back and it held pretty well.  I've found J-B Weld to be glow fuel-proof and have also used it to attach clunk weights to brass tubes in my 1oz fuel tanks.
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Post  Jason_WI Tue Dec 26, 2017 3:56 pm

Vent tubes can be pushed back out of the tanks and replaced. You can make vent tubes by sanding down a section of aluminum tubing. They wouldn’t be gold anodized though.
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Post  Cribbs74 Wed Dec 27, 2017 12:19 am

As long as they don’t cause a tank leak they will work fine as is. Not knowing the history, the front ends could be used, tanks could have been cleaned out, new rebuild kits installed and new backplates. Looks like some sealer was used on the gaskets so they have been apart at one time. The possibilities are endless.
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Post  MauricioB Wed Dec 27, 2017 9:20 am

Roddie, I'm glad to see that you're better! ... I'll tell you a solution that I do in these cases.
I take a spoke from a bicycle wheel, I adjust it well, I hit it by inserting it into the tube and the aluminum tube expands, then I extract the bicycle beam.
I give temperature to the aluminum tank with heat gun, and I incerto the expanded tube, when the tank cools it compresses the modified tube! Chau leaks! Solved theme friend!
Golden Bees from the Sturbridge trip... Tubo10
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Post  Tee Bee Wed Dec 27, 2017 10:49 am

Brilliant solution, Mauricio!
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Post  MauricioB Wed Dec 27, 2017 8:47 pm

Tee Bee wrote:Brilliant solution, Mauricio!

Thanks friend!!
It is advisable to place some fat in the bicycle beam, so that it is easier to extract later.
Placing a washer between the beam and the tube, then allows us to use the washer to retain the tube, without having to force the tube and deform it accidentally, it works, it really works! Very Happy Beer Cheers
Golden Bees from the Sturbridge trip... Tubo210
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Post  roddie Thu Dec 28, 2017 3:19 am

MauricioB wrote:Roddie, I'm glad to see that you're better! ... I'll tell you a solution that I do in these cases.
I take a spoke from a bicycle wheel, I adjust it well, I hit it by inserting it into the tube and the aluminum tube expands, then I extract the bicycle beam.
I give temperature to the aluminum tank with heat gun, and I incerto the expanded tube, when the tank cools it compresses the modified tube! Chau leaks! Solved theme friend!
Golden Bees from the Sturbridge trip... Tubo10
Golden Bees from the Sturbridge trip... Dsc05110

That's a very interesting method/fix Mauricio! Thank You for sharing!
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Post  dckrsn Fri Dec 29, 2017 10:54 pm

Mauricio, thank you!!
I do have an 8cc tank that leaks, and I thought sealing it from the
inside was my only solution. The technique you posted is pure genius.
I also have access to liquid nitrogen, perhaps to shrink the vent/fill tubes.
A new year hug for you!! Thumbs Up
Bob
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Post  Admin Fri Dec 29, 2017 11:14 pm

Great idea on expanding the vent tubes Mauricio!  Clapping

If you make a new thread on how-to tighten/seal the vent tubes, I'll make it a sticky. Or, this thread can be retitled.

Nice GB finds Roddie Thumbs Up

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Post  MauricioB Fri Dec 29, 2017 11:33 pm

dckrsn wrote:Mauricio, thank you!!
I do have an 8cc tank that leaks, and I thought sealing it from the
inside was my only solution. The technique you posted is pure genius.
I also have access to liquid nitrogen, perhaps to shrink the vent/fill tubes.
A new year hug for you!! Thumbs Up
Bob

In everything that can help and give my opinion, friend, count on me, I feel happy here ..! Small Cox Logo Christmas Tree cheers cheers
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Post  MauricioB Fri Dec 29, 2017 11:36 pm

Admin wrote:Great idea on expanding the vent tubes Mauricio!  Clapping

If you make a new thread on how-to tighten/seal the vent tubes, I'll make it a sticky. Or, this thread can be retitled.

Nice GB finds Roddie Thumbs Up

Thank you Jacob ... we are 15,000 km away, believe me I thank you from the heart for this forum that integrates many PEOPLE of good, is a forum in which I am honored to participate.
Count on me for what you need, if you want to create a new thread we do it with pleasure!
A hug for you!
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Post  getback Sat Dec 30, 2017 10:23 am

Great idea my friend !! I agree when trying to find solutions to problems sometimes are buried in threads that can bee very hard to find !?? Small Cox Logo
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