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BBD problems
https://www.slantsix.org/forum/viewtopic.php?t=53567		 Page 1 of 1
Author:  RumDungeon [ Fri Oct 11, 2013 11:40 am ]
Post subject:  BBD problems
Just got all my super six stuff installed last night,went to fire it up and fuel started gushing out of the top plate on the BBD. Any idea why this happened? I was under the impression that fuel isn't supposed to be up there, do I need to rebuild it, or just pull it apart and check it out?
Author:  powerwagonpaul [ Fri Oct 11, 2013 12:11 pm ]
Post subject: 
I would check the needle valve on the inlet to the carb. sounds like it may be not sealing and the fuel pump is pumping fuel up thru the bowl out the top plate. either that or the float may not me assembled right, is the "U" shaped clip in correctly?
http://u225.torque.net/cars/SL6/docs/BBD_Manuals.pdf
Author:  Reed [ Fri Oct 11, 2013 12:11 pm ]
Post subject: 
Check your float integrity and adjustment, and check the needle and seat (especially the orientation of the needle). The purpose of the float and the needle and seat is to plug the fuel inlet once the carburetor bowl gets full enough of fuel. A properly adjusted and assembled float and needle and seat assembly will prevent fuel form being pumped into the carb float bowl to the point it overflows. A misadjusted, mis-installed, or malfunctioning float or needle and seat will allow fuel to enter the float bowl continuously. The tip of the needle points to the outside of the carb. If you installed the needle backwards so the tip pointed at the float then you need a new needle and seat assembly.
Author:  RumDungeon [ Fri Oct 11, 2013 12:21 pm ]
Post subject: 
Thank you both, I just bought this stuff from a friend, so I have not been inside the carb yet. I will go pull it off and snap some pics. I am hoping to avoid buying a rebuild kit.
Author:  Reed [ Fri Oct 11, 2013 12:53 pm ]
Post subject: 
Best case scenario is you just need to adjust the float. Probable scenario is the float has developed a leak and needs to be replaced (buy brass if possible) and/or the needle was installed backwards and you need at a minimum a new needle if not needle and seat. Worst case scenario is there something major wrong with the carb and it needs to be replaced.
Author:  RumDungeon [ Fri Oct 11, 2013 1:58 pm ]
Post subject: 
This appears to have been rebuilt recently at the gaskets are supple and it has brass floats and the acc pump looks new...pics to follow
Author:  RumDungeon [ Fri Oct 11, 2013 2:02 pm ]
Post subject: 
Image
Image
Image
Author:  Reed [ Fri Oct 11, 2013 2:55 pm ]
Post subject: 
I am not seeing anything immediately apparently wrong in those pictures. Check the inlet needle and seat and check the float adjustment.

Brass floats can also get pinhole leaks. Check that those floats actually float and don't have a hole.

Are you aware that that is a V-8 carb? The PCV valve tube gives it away. Be sure to either use the correct slant six choke linkage or fabricate the adapter to mate the slant six choke thermostat rod to the v-8 carb choke linkage.
Author:  mattelderca [ Fri Oct 11, 2013 3:11 pm ]
Post subject: 
Quote:
Brass floats can also get pinhole leaks. Check that those floats actually float and don't have a hole.
Just a quick tip.
Drop the floats in a bowl of hot water and hold them under. If you see bubbles, they have holes. If your careful you can solder them with a soldering iron. Just don't add a ton of solder, and ensure there is no liquid inside them. Some gentle heat from a blow dryer can dry them out. Or splurge and buy new ones to be sure.
Author:  RumDungeon [ Fri Oct 11, 2013 5:28 pm ]
Post subject: 
Thanks everyone.

After finding nothing wrong inside the carb, I buttoned it all back up,installed it and it fired up almost instantly with no leaks! :D

Then I found out there is a MASSIVE exhaust leak in the hot box area... :roll:

Pulled everything back off, broke the bolts that hold it all together :roll: I knew this would happen though based on the shape they were in.

Tomorrow I will mate the intake with my old exhaust from my 1bbl stack, with a new hot box gasket,and try again.
Author:  Rug_Trucker [ Sun Oct 13, 2013 9:06 am ]
Post subject: 
RTV of any type is fire proof
Author:  RumDungeon [ Sun Oct 13, 2013 10:53 am ]
Post subject: 
Quote:
RTV of any type is fire proof
So it wont melt? Or it wont catch on fire? :shock: Even the blue stuff?
Author:  Reed [ Sun Oct 13, 2013 10:59 am ]
Post subject: 
I would try a Remflex gasket before I went to RTV. If you are going to use RTV, use the high temp copper RTV sealant.

http://catalog.remflex.com/MOPAR_Header ... p/6008.htm

Includes manifold to head gasket and the "riser gasket" which I believe is the manifold to manifold gasket.
Author:  RumDungeon [ Sun Oct 13, 2013 11:49 am ]
Post subject: 
I fixed the leak, not 100%, but like 97%. I filed the mating surfaces clean,and used a new steel gasket. Should be fine until I can buy the Remflex gaskets.

I forgot how much off a difference a super six makes! Its much punchier now,and wants to fry those little 13's above half throttle....but that's not too hard to do :lol:
Author:  Rug_Trucker [ Mon Oct 14, 2013 6:26 am ]
Post subject: 
A friend tried to torch some dried blue stuff. Oxy Acetelene is much hotter than exhaust. On V8's I put a thin layer on the manifold and bolt it to the head. Never had a problem. Factory many times didn't use gaskets.
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