Re: Carb body repair

**Cribbs74** Fri Feb 10, 2012 9:14 am

Big Al wrote:Guys, my experience with JB Weld wasn’t that great. I repaired a carb with it and thought it came out fine. But about half way thru the first flight the motor started to run rough. I landed and saw that the carb repair had turned to doo-doo. The JB had turned into a bright GREEN gooey mess. Never used it since (around nitro) but I see lots of folks have good results.
Any ideas what I did wrong? It could have been a sloppy mix proportion or maybe it had exceeded its shelf life? Maybe whatever I used to clean the parts (don’t remember) wasn’t compatible?
Anyone else seen this?
Al

Al,

I have seen the "green goo" I used JB weld to repair a sending unit inside a gas tank on my truck. I was in a time crunch and needed to make a road trip the next day and I didn't have time to let the JB fully cure. The gasoline reacted with the JB and it never fully cured.

I am not sure if that was the case in your experience. I have noticed that temp and humidity sometimes lengthen the cure time.

Big Al Fri Feb 10, 2012 12:53 pm

cribbs74 wrote:
Big Al wrote:Guys, my experience with JB Weld wasn’t that great. I repaired a carb with it and thought it came out fine. But about half way thru the first flight the motor started to run rough. I landed and saw that the carb repair had turned to doo-doo. The JB had turned into a bright GREEN gooey mess. Never used it since (around nitro) but I see lots of folks have good results.
Any ideas what I did wrong? It could have been a sloppy mix proportion or maybe it had exceeded its shelf life? Maybe whatever I used to clean the parts (don’t remember) wasn’t compatible?
Anyone else seen this?
Al

Al,

I have seen the "green goo" I used JB weld to repair a sending unit inside a gas tank on my truck. I was in a time crunch and needed to make a road trip the next day and I didn't have time to let the JB fully cure. The gasoline reacted with the JB and it never fully cured.

I am not sure if that was the case in your experience. I have noticed that temp and humidity sometimes lengthen the cure time.

Hi Ron, I bet that was the problem. I don’t remember the details but probably did the repair one day and flew the next.
Thanks for the reply.
Al

**Cribbs74** Fri Feb 10, 2012 9:16 pm

Jason_WI wrote:Whats the OD of the of the carb neck? Do you have a caliper?

The pic of the olympic rear drum valve on Martin's site has this type of repair.

Jason,

The OD is 15/32. I wonder if they make aluminum tubing with a 15/32 ID?

Jason_WI Sat Feb 11, 2012 2:40 pm

Not sure on the tubing. I could turn you one. Problem is I dont have a TD 15 yet to test fit it.

Jason

**Cribbs74** Sat Feb 11, 2012 2:49 pm

Jason,

Sending you a PM now

Jason_WI Fri Feb 24, 2012 7:48 pm

Here is the pic of the repaired carb body!

**Cribbs74** Fri Feb 24, 2012 10:56 pm

I think it looks pretty darn good Jason! Wink

Ivanhoe Sat Feb 25, 2012 2:18 am

Great Job, Jason! cheers

GermanBeez Sat Feb 25, 2012 3:23 am

it's a hybrid!

**RknRusty** Sat Feb 25, 2012 4:13 am

Beautiful job. I'm tempted to re-enforce mine before it cracks.
So, was that 15/32 ID?

**Cribbs74** Sat Feb 25, 2012 8:13 am

RknRusty wrote:Beautiful job. I'm tempted to re-enforce mine before it cracks.
So, was that 15/32 ID?

I was told the ID was .459, keep in mind that is a .15 body.

engine049 Mon Mar 05, 2012 7:48 pm

Very nice repair I was gonna suggest. In plastic Drilling tiny holes at the end of your cracks stops a crack in its track. also gives a bigger surface for whatever adhesive you use Jb weld has always worked pretty well for me but I like to rough a surface up REALLY well Also its a good idea to carve a v into your stuff with something like this

http://www.ebay.com/itm/5-Pcs-4mm-Cone-Shaped-Nose-Diamond-Mounted-Point-Burr-/390396328196?pt=LH_DefaultDomain_0&hash=item5ae56f3904

I use http://www.ebay.com/itm/SOLID-CARBIDE-MICRO-DRILLS-FITS-DREMEL-JEWELRY-MODEL-RAILROAD-CRAFTS-/180834821595?pt=LH_DefaultDomain_0&hash=item2a1a9865db

I generally use those drills to drill holes for Babbington Waste oil burners however for small plastique

I also use them for nail Avulsions

From youtube somewhere not my nail but i just drill by hand to release pressure

Thanks for The 1+`s

**RknRusty** Mon Mar 05, 2012 8:29 pm

engine049 wrote:Very nice repair I was gonna suggest. In plastic Drilling tiny holes at the end of your cracks stops a crack in its track. also gives a bigger surface for whatever adhesive you use. I use http://www.ebay.com/itm/SOLID-CARBIDE-MICRO-DRILLS-FITS-DREMEL-JEWELRY-MODEL-RAILROAD-CRAFTS-/180834821595?pt=LH_DefaultDomain_0&hash=item2a1a9865db

Thanks for the tip, I've never done that. Carb body repair - Page 2 Slaphead

DUH!

I have to have those bits. Maybe I'll get those for my birthday present if the price doesn't climb too high. They're probably easy enough to find elsewhere, like Grainger, maybe.

**Cribbs74** Mon Mar 05, 2012 8:40 pm

engine049 wrote:Very nice repair I was gonna suggest. In plastic Drilling tiny holes at the end of your cracks stops a crack in its track. also gives a bigger surface for whatever adhesive you use. I use http://www.ebay.com/itm/SOLID-CARBIDE-MICRO-DRILLS-FITS-DREMEL-JEWELRY-MODEL-RAILROAD-CRAFTS-/180834821595?pt=LH_DefaultDomain_0&hash=item2a1a9865db

I generally use those drills to drill holes for Babbington Waste oil burners however for small plastique

I also use them for nail Avulsions

From youtube somewhere not my nail but i just drill by hand to release pressure

Good idea! For both situations...... Lost 3 fingernails in the last year. Next time I will be drilling them out!

**RknRusty** Mon Mar 05, 2012 9:32 pm

It works. I've done it with a red hot pin. I would torch the drill bit to sterilize it first too.

engine049 Tue Mar 06, 2012 3:25 am

RknRusty wrote:It works. I've done it with a red hot pin. I would torch the drill bit to sterilize it first too.

About the red hot pin I might be concerned that the red hotness might cauterize the blood from escaping Ill try this method next time I smash my finger blue lol

Ba BLAM http://www.ebay.com/itm/20Piece-Micro-Drill-Bits-Index-61-80-with-Plastic-Storage-Case-SHIPS-FROM-USA-/250966017786?pt=LH_DefaultDomain_0&hash=item3a6ebd86fa $4 including shipping

Also my dad used to use an exacto knife and spin spin spin then Poof done.. http://www.ebay.com/itm/5-Surgical-Blades-15-w-Scalpel-Handle-3-Dental-FREE-/130659541719?pt=LH_DefaultDomain_0&hash=item1e6bea62d7

A scapel and blades can be bought REALLY CHEAP and comes with 5 blades i just got mine the guy send 10 COOL! but blade 11 is best and they are gamma radiation sterilized AMAZING for removing splinters nail avulsions any kind of self surgery they are Great for crafts they last longer than Crapzacto knives their sharper. and it makes you feel like a surgeon : Smile

).

**RknRusty** Tue Mar 06, 2012 7:13 am

engine049 wrote:Ba BLAM http://www.ebay.com/itm/20Piece-Micro-Drill-Bits-Index-61-80-with-Plastic-Storage-Case-SHIPS-FROM-USA-/250966017786?pt=LH_DefaultDomain_0&hash=item3a6ebd86fa $4 including shipping

Ba BLAM is right. Free shipping. I'm going to have a hard time controlling myself shopping here. A few bad feedback comments, buyer beware, but I'll have to give him a try.

engine049 Tue Mar 06, 2012 10:29 am

RknRusty wrote:
engine049 wrote:Ba BLAM http://www.ebay.com/itm/20Piece-Micro-Drill-Bits-Index-61-80-with-Plastic-Storage-Case-SHIPS-FROM-USA-/250966017786?pt=LH_DefaultDomain_0&hash=item3a6ebd86fa $4 including shipping

Ba BLAM is right. Free shipping. I'm going to have a hard time controlling myself shopping here. A few bad feedback comments, buyer beware, but I'll have to give him a try.

300-600 transactions per month. Sometimes you just can`t please everyone... I have been able to but its been tough 1'ce I wrote handwritten letter requesting revision. I got negged for a stupid microwave i had written a reserve in the description in and then when they revised they changed to neutral I even offered to send the dude some free hotwheel car. GRRRRRR

I look at Bernies feedback and know how amazing his customer Service is and people still neg him. I remember when he got his first Neg ever. He was not a happy camper.

Ivanhoe Tue Mar 06, 2012 10:57 am

RknRusty wrote:
engine049 wrote:Ba BLAM http://www.ebay.com/itm/20Piece-Micro-Drill-Bits-Index-61-80-with-Plastic-Storage-Case-SHIPS-FROM-USA-/250966017786?pt=LH_DefaultDomain_0&hash=item3a6ebd86fa $4 including shipping

Ba BLAM is right. Free shipping. I'm going to have a hard time controlling myself shopping here. A few bad feedback comments, buyer beware, but I'll have to give him a try.

He has the usual rather inflated idea of International shipping costs though, he'd want 3 times the cost of the drills to ship them here! and I get engines from the States for $5 -$10 shipping!

Jobe_Pro Sat Mar 17, 2012 7:36 am

Well I just tried JB Weld on my TEE DEE's Carb body, after sitting for 30 years I pulled it out started cleaning it up to fire it up, the needle was loose so I tightened up the carb and I heard it crack on the top edge at the back right threw the threads for the Carb vent, sanded it up and put a little J B's on it seems to be holding but I really haven't got this thing fired up yet, she's being stuborn runs for a half min and stops, wondering if i's the crack, Like I said another post the old plastic red Cox tank doesn't seem to be as strong as it use to be either.
Bought a new carb housing to replace this if it doesn't work.

SuperDave Sat Mar 17, 2012 8:15 am

Jobe:

We've had an extensive discussion of this very topic that might be found in the search file. You may need to use several different "serch words" or combinations to find it.

IIRC, the J-B Weld "fix" is temporary at best. The new part is available from Matt for $6.95, not sure about the other vendors.

**RknRusty** Sat Mar 17, 2012 8:35 am

SuperDave wrote:Jobe:

We've had an extensive discussion of this very topic that might be found in the search file. You may need to use several different "serch words" or combinations to find it.

IIRC, the J-B Weld "fix" is temporary at best. The new part is available from Matt for $6.95, not sure about the other vendors.

He's already got a new one if the fix doesn't work.
If you need to search this site, you get better results if you use Google Advanced Search, type "coxengineforum.forumakers.com" into the Domain search box and then enter your search terms. All results will be from this forum. Same with RCG, RCU or any other site for that matter.

Jobe_Pro Mon Mar 26, 2012 1:59 pm

Well, Jb'S did'nt hold, so I replaced the carb housing, slapped a 5x3 prop on it ad fired it up, been running it with a 5x41/4 Nylon, it screems evven more with the 5x3.

Jason_WI Mon Apr 23, 2012 10:15 pm

Another TD 15 carb body resurrected. Here is Jacob's (Admin) TD 15 that I repaired the carb body on tonight.

Here is a before pic:

Here is after the aluminum ring is attached:

Side view of the TD 15 with the carb body repaired:

Jason

**Cribbs74** Mon Apr 23, 2012 10:40 pm

That looks familiar........

Think it would be possible to do .010/.020 ones? Perhaps too fiddly? lol!

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