Rochester 2bb Carb Rebuild Problem

[BLDFW]

Got a problem with my 2G-2GC Rochester 2bbl rebuild I'm hoping someone can give me some insight on.

A little history: When I took it apart I made note of where all the pieces go so I could put it back together correctly. It appears that someone "attempted" to rebuild the carb before but did not know what they were doing.

First off, it appears it was not soaked in any kind of carb cleaner as I found gunk that normal would be cleared out. The source tube that supplies gas from the fuel bowl to the accelerator pump was completely clogged with gunk. It took me about two hours of messing with it before it finally cleared out allowing flow.

The accelerator pump springs appear to be reversed with the big spring on the pump shaft itself and the smaller less springy spring down in the hole. I'm 99.9% sure it supposed to be the other way around as the smaller spring sits funny down in the hole while the larger spring would sit on a ledge if it were in there....so I reversed them and both springs seem better fitted and working just fine.

The other problem I have is that with the kit, there were two different size steel balls, one for the "pump intake" below the accelerator pump, and one for the "pump discharge" hole under the jet cover. BUT....when I took carb apart, it contained two balls of the same size (the larger ones). The instructions are vague as to which size goes in which hole. I think I may have them reversed wherein lies my problem.

I dropped a larger ball in the accelerator pump tube where it fell into the hole it's supposed to sit in but I think the ball is supposed to be the smaller one and now I can't get it out. I've tried compressed air in the source hole, banging on it, picking at the ball with a needle tip pic, and even heating it (no gasoline present) it to see if the ball will fall out. So far no luck.

Anyone undertake a rebuild of this particular carb? Is the smaller ball supposed to go in the Accelerator pump tube? Any suggestions on how I can get that ball out of there?

I'd sure hate to have to buy another carb because of that minor (or is that MAJOR) problem.

Thanks.

 

[BLDFW]

Updated: Rochester 2bb Carb Rebuild Problem

Updated: Rochester 2bb Carb Rebuild Problem

Here's a pic of that pesky bearing stuck in the accelerator fuel intake hole.

Got another question..... Some carb bodies don't have this feature. What would be the performance ramifications to use a body that does not have this feature?

Thanks.

 

[Surfdancer]

Re: Rochester 2bb Carb Rebuild Problem

That pesky little ball is supposed to be there, but it's supposed to be aluminum and move freely. It's the check ball for the accelerator pump circuit. A rebuild kit contains a new one, so remove it with a scratch awl and / or some air pressure. Soak the carb body to clean the seating area and the ball won't stick closed. If you put a steel ball down there, try lifting it out with a small magnet.

Also, you need to remove the power valve before soaking the carb. I made a tool by cutting a slot in a wide screwdriver with a dremel and cut off wheel. The brass valve assy will unscrew with normal thread motion. Once it's out, a puff of air should push the ball up and out.

 

[BLDFW]

Re: Rochester 2bb Carb Rebuild Problem

That's my $300+ problem. The carb has been cleaned but in the reassembly process the wrong size ball was dropped in the hole and now I can't get it out to put the smaller size ball in the hole. Not sure what I can do now aside from finding a new body.

 

[BLDFW]

Re: Rochester 2bb Carb Rebuild Problem

I should say I've tried the scratch awl, compressed air, penetrating lube, banging on the body, etc. I even tried a little heat from a torch but wasn't sure just how much to apply.

 

[ziggy]

Re: Rochester 2bb Carb Rebuild Problem

i can't tell ya how big the ball brgs are. i can't remember. but here's a couple pics i snapped. maybe that'll help..

ball brg. prior to removal. it does look bigger than yers. as for where ya got the arrow pointed too. i just had a screen over that area on mine.

on the right, closest to the bottom of the pic. with the bar accross the hole. under that was a spring and the only other ball brg. i found in mine.

upper right going down, then back to the top and left. parts in order of removal...

don't know if that helps.. need a pic of anything else. let me know. i photoed my disassembly on that rebuild. a 2gc..


did ya try a magnet to get the ball brg. out?

 

[BLDFW]

Re: Rochester 2bb Carb Rebuild Problem

i can't tell ya how big the ball brgs are. i can't remember. but here's a couple pics i snapped. maybe that'll help..

ball brg. prior to removal. it does look bigger than yers. as for where ya got the arrow pointed too. i just had a screen over that area on mine.

on the right, closest to the bottom of the pic. with the bar accross the hole. under that was a spring and the only other ball brg. i found in mine.

upper right going down, then back to the top and left. parts in order of removal...

don't know if that helps.. need a pic of anything else. let me know. i photoed my disassembly on that rebuild. a 2gc..


did ya try a magnet to get the ball brg. out?

Thanks for the pics. You have the same carb. Yes, the arrow points to the fuel duct that goes into the accelerator pump chamber and mine also has the screen that keeps particulates from gumming up the duct.

I fear at this point that since I can not dislodge the ball, I'm going to have to track down another 2G carb body. Sucks for sure!

 

[Bifflefan]

Re: Rochester 2bb Carb Rebuild Problem

fill the carb with water. then put the acc. pump in place. Go with me on this, whack the pump with something to force the water throught the hole and it should come out. dont hit so hard that you do other damage. also you have gotten it stuck to badly when you heated it. but we dont know that yet. If that doesnt work, then you can try using grease instead of water. both dont compress and should shoot it out like a rocket (hope you have a spare ball).
If that doesnt work then you may have to go a junk yard and get one to put your kit in. Just look for lose bushing in the throttle shafts, if they are loose ask for a different one.

 

[jack gardner]

Re: Rochester 2bb Carb Rebuild Problem

ok get some dry ice put it right over the ball slowly yse controlled air pressureon the area it should shrink the ball b 4 te carb as smaller tap and ball should fall out it worked on a valvebody 4 me

 

[fishrdan]

Re: Rochester 2bb Carb Rebuild Problem

Flip the carb over and WHACK it (lift carb up and bang it) on a piece of wood, make sure the carb is stripped and no parts are sticking up above the gasket surface. Wood will protect the surfaces from getting marred,,, but be careful as you don't want to bend/break/gouge anything. If that doesn't work, try tapping on the bottom of the carb while it's flipped upside down, again careful as you don't want to damage the gasket surfaces.

 

[totx]

Re: Rochester 2bb Carb Rebuild Problem

Heat it up again, turn it up side down and use shock spray...
And knock it against a piece of wood (ore carefully to a solid piece of brass)

 

[BLDFW]

Re: Rochester 2bb Carb Rebuild Problem

Unfortunately the bearing is permanently lodged so I will have to find a new fuel bowl section. The accelerator pump will still work but will prob not refill as readily. It will behave the same as a carb version without that feature.

So, the plan of the moment is to rebuild the carb as is so I can get out on the lake and then seek out a replacement carb/fuel bowl. I know a couple of junk yards that have older cars. Rochester 2bbl carbs are still out there if you know where and what to look for.

PIA!

 

[stonyloam]

Re: Rochester 2bb Carb Rebuild Problem

You could take a piece of wire (the larger the better) dip it in some JB weld and glue it to the ball. A tiny amount should do. Let it set up overnight and see if you can pull it out. Got nuthin to loose now. I would be tempted to run my mig welder wire down there and give it a quick hit to weld the wire to the ball, last desperate measure.

 

[BLDFW]

Re: Rochester 2bb Carb Rebuild Problem

You could take a piece of wire (the larger the better) dip it in some JB weld and glue it to the ball. A tiny amount should do. Let it set up overnight and see if you can pull it out. Got nuthin to loose now. I would be tempted to run my mig welder wire down there and give it a quick hit to weld the wire to the ball, last desperate measure.

Thanks for the ideas but I thought about the glue idea too but figured just my luck I'd have a dab too much and it would run off the ball and seal my fate. Same thing with the welding idea.

Oh well, too late now anyway. I have it all put together. I'll find another 2GC carb somewhere.

 

[cr2k]

Re: Rochester 2bb Carb Rebuild Problem

Why would you grind a screwdriver to remove the power valve? It compresses far enough under a regular screwdriver with no problem.

The upside down "wack" method is probably the best.

Accelerator pump spring...The larger diameter spring (stiffer one) goes on the pump assy. the smaller one goes in the hole to return the pump to up position. If your kit comes with a new accelerator pump use which ever spring (new or old) that is stiffer for proper pump action. Softer spring is for automotive and may not provide enough pump for boating and you may have a hesitation.

Good luck with the ball issue. I do about 8 of these carbs every summer.

 

[fishrdan]

Re: Rochester 2bb Carb Rebuild Problem

Heres another thought. Strip it back down, remove all the plastic parts (if not possible to remove all plastic don't read further) and place it upside-down into the oven with this evening's meatloaf. When the meatloaf has browned nicely, remove the carb and give it the upside down whack. Hopefully the aluminum has expanded and let go of the ball,,, and hopefully the wifey hasn't discovered the carb...

Mmmmm, tastey gas flavored meatloaf

 

[gandl2123]

Re: Rochester 2bb Carb Rebuild Problem

Wow, what a great bunch of problem solving minds....

1.) I have a similiar problem here. My 2 brl Mercarb kit ($53.00) must have had a bigger ball bearing as well. I placed it, not in the accelerator pump, but in the check ball/spring/area for the supply of the fuel coming from the pump well.

2.) I rebuild my carb after 2 days of soaking in cleaner tank. The paint was all off down to what looked like sand-blasted metal. It was going great.

3.) Hooked it up in the boat and for some reason it started but would fall on its face when accelerator was pushed. Took the carb back off to see if I missed something.

4.) Took T, spring and noticed ball bearing was not coming out. No matter what I hit it on or sprayed in it the ball is stuck. Not in accelerator well but farther up the stream in the with the spring and T thing.

Here is what I will try tomorrow....one of your ideas, and one of mine.

1.) I will try the oven without the meatloaf to see if the difference of expansion and contraction will work.

2.) I'm going to find the "PRECISE" location from underneath the ball bearing and drill a hole up to the back of it. Attempt to push the bearing out from the bottom and then seal the hole.

I have already drilled out the factory hole that leads from the pump well and over to the ball bearing, spring and T and tried to run a hanger over to it and force it out (kind of from the side) but that didn' t work. Its more work with the drill if I can find the exact location underneath the ball...1/2" depth from the bottom, only problem is that there is a passageway that is very close to the point where I must drill....going to use a VERY small bit and try to be exactly under the bearing.

Greg

 

[gandl2123]

Re: Rochester 2bb Carb Rebuild Problem

A bit more....

When I first dropped the ball in, (should have used the for sure old one, as the difference in size is almost not detectable by the naked eye) I put the spring on top and then put the T down in there through the spring. I had to tap it in the last 1/16 to 1/8 of an inch which is what I felt was normal resistence to keep the ball in place.

What a mistake, this was the force that "jammed" the ball bearing into the bottom of the hole and now I can get it out.

Last question, This is a 2 brl Mercarb and is similiar to the Rochester. Can I simply go to a junkyard (there are plenty of old, chevy, buick etc... near me) and pick up a 2 brl Rochester and bolt it up? What do I need to look for here or do I just grab one and put my carb kit in it with the new middle section?