Need help, screwed up a Mercarb rebuild....

[JasonB]

Friend bought a boat with a 2bbl mercarb. It had a rythmic ticking sound I finally tracked down to the back venturi of the carb dripping fuel. When the drips would hit the throttle plates, it sounded like a muffled tick.

No problem, pull it apart, clean it and rebuild it. Simple enough.

Got it back on teh boat after rebuild, same problem. Pulled it back down and soaked it this time in a bucket of cleaner, then I discovered my worse mistake. Fist off, I had picked up the wrong carb kit, got one for a 2GC, no biggie, I can make the one gasket that is different. Biger problem though... I forgot that there are two different checkball sizes and I found I dropped the wrong one in the accelerator pump hole under the venturi.

I have tried to clow it out with air to no avail. I can only see two options:

1: use a slow speed drill press to try to drill through the checkball, hook it, and pull it out

or

2: drill out the ball at the end of the veign in the bottom of the accelerator pump well and try to use a piece of wire the push the ball back out.

Any suggestions? I prefer #1, but is it possible to drill through a checkball?

Assuming I can get teh ball out without damaging the carb, any particular spot I need to double check to solve the original drip?

Thanks.

 

[jaxnjil]

Re: Need help, screwed up a Mercarb rebuild....

no i dont think you can drill it out. its to hard and the bit will slide of to the side and you'll end up drilling the carb body
sounds like your float is set to high. this is the first thing i would check any way

 

[Don S]

Re: Need help, screwed up a Mercarb rebuild....

Sounds like it time for a new or remanned carb.
If things are corroded so bad you have to consider drilling a check ball out. The carb is called junk.

 

[JasonB]

Re: Need help, screwed up a Mercarb rebuild....

Don, my problem isn't corrosion, I had a stupid moment and dropped the wrong size check ball ball in the hole....

I essentially made the mistake noted here: http://www.highperformancepontiac.com/tech/0303pon_pontiac_tri_setups_part_iii/photo_09.html

Except I dropped the wrong size ball in the hole the T retainer goes in under the venturi....

 

[JasonB]

Re: Need help, screwed up a Mercarb rebuild....

Correction, the pump discharge check ball is the one I hosed up.

 

[45Auto]

Re: Need help, screwed up a Mercarb rebuild....

Doubt it you can drill it out. The drill will skate off the side of the ball and ruin the carb body. Even if you use a mill and line everything up, the ball will just spin as the mill tries to cut into it.

If you haven't wedged it in messing with it, you can probably put a thin oil into the passage from the accelerator pump side and force it out with the accelerator pump plunger. Kind of like plunging a toilet ......

I've also seen people use a piece of hose small enough to fit into the hole, and sealed to a shop-vac nozzle, to pull the ball out using the vacuum.

Good luck!