Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


A collaboration - Kim, Jacob, and a Cox Mercedes. Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
September-2019
Levent Suberk's

CEF Magazine cover featuring the Ex Model Engines Harpy Eagle .049



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


A collaboration - Kim, Jacob, and a Cox Mercedes. Empty
World of Aviation

A collaboration - Kim, Jacob, and a Cox Mercedes.

Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  rsv1cox on Thu Jul 11, 2019 7:55 am

Some time ago Kim sent me an original (not plastic) vent-less back-plate for my incomplete 5cc stunt tanked Mercedes engine but still lacking the extended needle common to these.  Then a week or so ago Jacob hooked me up with an ebay Golden Bee that had one in place of the standard needle.  BIN I jumped on it for a very reasonable price.  

Fast forward to yesterday, a frustrating day if there ever was one. (See Ok Cub adventure) The Mercedes engine was already clean so I added the extended needle, filled the tank and flipped.  Ran off the prime and that was it.  Think over and over!
 
Sum Ting Wong.... so I removed the tank only to find it dry.  WHAT! I filled it until fuel ran out the bottom tube...or so I thought.  Put it back together and tried again.  Same thing.  Fool me twice.  So I looked closer, the fuel running out of the bottom vent was actually fuel from the poor fitting fill tube running down the outside of the tank.

Removed the tank again, dry.  

So I blew compressed air through the top tube finding it blocked with fuel goo.  These Mercedes engines due in part to the confined engine space get hot with spent castor all over the place and if not properly cleaned after use can cause nightmares.

Took a wire and cleaned the goo out of both tubes and blew out with aerosol Remoil and compressed air and put it back together with new gaskets and filled the tank.

Same thing. Ran off the prime.  Checked the tank only to find fuel leaking out around the bottom overflow tube.  

That's it. Grrr.. Sad  I replaced the whole back end with a vented backplate and standard 5cc tank flipped and it ran like a Cox engine should.  Reassembled as a Mercedes engine and retired it.  I cleaned the Golden Bee, my first ever favorite Cox engine but did not run it.

A collaboration - Kim, Jacob, and a Cox Mercedes. P7100014
A collaboration - Kim, Jacob, and a Cox Mercedes. P7100015

Thanks Kim and Jacob, but in a losing cause.  Maybe some day I will find a way to seal those tubes so they don't leak.  But I did gain a Nice Golden Bee out of it.  Second one I have out of about 8 that have a natural case.

Mercedes engine shown in proper configuration.
rsv1cox
rsv1cox
Top Poster
Top Poster

Posts : 4566
Join date : 2014-08-18
Location : West Virginia

View user profile

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  Kim on Thu Jul 11, 2019 8:03 am

Sorry for the stupid comment...should have had some more coffee before typing....


Last edited by Kim on Fri Jul 12, 2019 6:43 am; edited 1 time in total
Kim
Kim
Top Poster
Top Poster

I Support My Forum

Posts : 6686
Join date : 2011-09-06
Location : South East Missouri

View user profile

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  Admin on Thu Jul 11, 2019 9:27 pm

Nice! Thumbs Up

So the cross vent tubes are leaking on the Mercedes tank? Perhaps some high temp RTV sealant applied around the tubes on the inside of the tank will stop the leak. Maybe some thin wire or torch tip files to clean out the inside of the tubes if it doesn't want to run with a ventless backplate.

I've always liked those classic Golden Bees! Beer Cheers

_________________
-Jacob


Admin
Admin
Administrator

Posts : 5010
Join date : 2010-07-27
Location : Roseville, Minnesota

View user profile http://sites.google.com/site/coxenginecollection/

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  Oldenginerod on Thu Jul 11, 2019 9:55 pm

I'd suggest a drop of good quality CA around each tube on the inside. Spotless clean of course.
Oldenginerod
Oldenginerod
Diamond Member
Diamond Member

Posts : 2659
Join date : 2012-06-15
Age : 56
Location : Victoria, Australia

View user profile

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  rsv1cox on Fri Jul 12, 2019 6:26 am

Oldenginerod wrote:I'd suggest a drop of good quality CA around each tube on the inside.  Spotless clean of course.

I have tried this before, with epoxy. Didn't work, over time the fuel breaks it down, JB Weld too. Both get gummy. Don't know about CA.

Lot's of corrosion around the base of each tube on this one. As mentioned it's out of the first Cox Mercedes that I bought, old broken up #2. Only thing that would clean it up is low pressure sand blasting with aluminum oxide.
rsv1cox
rsv1cox
Top Poster
Top Poster

Posts : 4566
Join date : 2014-08-18
Location : West Virginia

View user profile

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  KariFS on Fri Jul 12, 2019 9:39 am

How about silicone sealant? Some fuel hoses are made of silicone and hold up pretty good Huh...

Btw how are those pipes attached originally? Some kind of soldering, or just a very snug press fit?
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1555
Join date : 2014-10-10
Age : 47

View user profile

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  rsv1cox on Fri Jul 12, 2019 10:13 am

KariFS wrote:How about silicone sealant? Some fuel hoses are made of silicone and hold up pretty good Huh...

Btw how are those pipes attached originally? Some kind of soldering, or just a very snug press fit?

That might work kari, I have some blue and red tube.  Red tube holds about anything.

Yes, press in snug fit.  Nice clean solution but this isn't the first one that I have that leaks.  Remember, for a long time I bought engines that I labeled the worst of the worst.  Can't expect much when your bottom feeding.  

Bob
rsv1cox
rsv1cox
Top Poster
Top Poster

Posts : 4566
Join date : 2014-08-18
Location : West Virginia

View user profile

Back to top Go down

A collaboration - Kim, Jacob, and a Cox Mercedes. Empty Re: A collaboration - Kim, Jacob, and a Cox Mercedes.

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum