'66 232 - Carter WCD - Dripping Nozzles

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

I have a 66 American with a Carter WCD 2BBL carb.  My problem is that after the engine gets hot, when it is shut off, the carb drips gas out of the main nozzles.  I was reading up on this in my TSM and found the following:  
During idle operation or particularly with the engine shut off (with hot engine on a warm day) fuel sometimes boils and expands in the bowl and the various passages in the carburetor.  When these vapor bubbles in the high speed passage force liquid fuel out of the nozzle , the carburetor is said to be percolating.  An anti-percolator bushing is located at the top of the idle well in a diagnoal passage to the main nozzle to allow these bubbles to bleed back to the idle well rather than be forced out the main nozzles.

If read quite a few posts here regarding this issue.  Generally the two main suggestions are 'cool' and 'adjust the floats'.  There is already a spacer between the carb and the manifold and I have tried the floats in numerous positions.  So this brought me to these anti-percolator bushings.  I took a small piece of stiff wire and tried running it through the passages and they seem plugged.  Are they supposed to be?  I don't see how it can allow the "bubbles to bleed back" if it's plugged with something.  Should I take a small drill bit and clean them out by hand?  I attached photos to show what passage I'm referring to.

Finally, I noticed also in the images in the TSM there is a heat shield between the manifold and the carb.  I don't have this shield.  Is it missing?

Thanks,
Tom

Edited by tloftus - Sep/13/2011 at 8:24pm

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
tloftus Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List AMC Apprentice Joined: Mar/18/2008 Location: Iowa Status: Offline Points: 137	Post Options Post Reply Quote tloftus Report Post Thanks(0) Quote Reply Topic: '66 232 - Carter WCD - Dripping Nozzles Posted: Sep/13/2011 at 8:24pm
	I have a 66 American with a Carter WCD 2BBL carb. My problem is that after the engine gets hot, when it is shut off, the carb drips gas out of the main nozzles. I was reading up on this in my TSM and found the following: During idle operation or particularly with the engine shut off (with hot engine on a warm day) fuel sometimes boils and expands in the bowl and the various passages in the carburetor. When these vapor bubbles in the high speed passage force liquid fuel out of the nozzle , the carburetor is said to be percolating. An anti-percolator bushing is located at the top of the idle well in a diagnoal passage to the main nozzle to allow these bubbles to bleed back to the idle well rather than be forced out the main nozzles. If read quite a few posts here regarding this issue. Generally the two main suggestions are 'cool' and 'adjust the floats'. There is already a spacer between the carb and the manifold and I have tried the floats in numerous positions. So this brought me to these anti-percolator bushings. I took a small piece of stiff wire and tried running it through the passages and they seem plugged. Are they supposed to be? I don't see how it can allow the "bubbles to bleed back" if it's plugged with something. Should I take a small drill bit and clean them out by hand? I attached photos to show what passage I'm referring to. Finally, I noticed also in the images in the TSM there is a heat shield between the manifold and the carb. I don't have this shield. Is it missing? Thanks, Tom Edited by tloftus - Sep/13/2011 at 8:24pm
	1966 AMC Rambler American Rogue - 232 I6

pacerman Members Profile Send Private Message Find Members Posts Add to Buddy List Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Online Points: 3927	Post Options Post Reply Quote pacerman Report Post Thanks(0) Quote Reply Posted: Sep/13/2011 at 11:59pm
	Are you sure those fittings shown in the second picture are not the low speed jets? I have an exploded view of a WCD carb in my 62 TSM and it does not show the bushings you mentioned. Joe
	Happiness is making something out of nothing.

purple72Gremlin Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 10085	Post Options Post Reply Quote purple72Gremlin Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 12:25am
	double check the floats

ihcdiamondreo Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Apprentice Joined: Sep/01/2010 Status: Offline Points: 97	Post Options Post Reply Quote ihcdiamondreo Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 11:10am
	Use carb cleaner to clean out any blockage. The float level in some referance material is 1/8 inch and others 1/4 inch. Try setting at 1/4 inch.

billd Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 22780	Post Options Post Reply Quote billd Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 11:49am
	Air bleeds help prevent siphoning as the fuel levels rise, or through normal operation. Restricted or plugged bleeds allow it to run rich, and/or drip after shut-down. Can you blow air BACKWARDS through them? Cleaner? Does any air or liquid get through? Somewhere I bet I have a cut-away view showing allthe passages and purposes. Without it in my hands, I don't want to say much more.
	http://theamcpages.com http://antique-engines.com

tloftus Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List AMC Apprentice Joined: Mar/18/2008 Location: Iowa Status: Offline Points: 137	Post Options Post Reply Quote tloftus Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 3:10pm
	When I get home I will post the picture from the book that shows the cut away. I can't blow through it easily with air or carb cleaner due to the size and angles of the holes. Maybe I can get a small piece of vacuum hose or something and try it though. The picture shows something in that passage, possibly reducing the size of it? I'm not sure -- I will post when I get home to see if you guys have any ideas. I will also let you know if I can blow through it once I find a piece of hose and plug all the other places those nozzles are ported to. Thanks, Tom
	1966 AMC Rambler American Rogue - 232 I6

Thikstik Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Mar/20/2008 Location: Alabama Status: Offline Points: 1078	Post Options Post Reply Quote Thikstik Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 3:32pm
	I wouldnt drill!! Youll throw off another circuit.
	75 gremlin x, jeep 4L headed 258,Clifford cam, intake,header. 390 holley. I want a 282 VAM motor! AC/PS/PDB. 72 AMX , 304 2bbl, 3speed, now disks...probably will sell, want an automatic /AC.

billd Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Moderator Group Forum Administrator Joined: Jun/27/2007 Location: Iowa Status: Offline Points: 22780	Post Options Post Reply Quote billd Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 3:45pm
	I have a set of torch tip cleaners I use with great care on air bleeds. They won't increase the size if one is really careful.
	http://theamcpages.com http://antique-engines.com

tloftus Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List AMC Apprentice Joined: Mar/18/2008 Location: Iowa Status: Offline Points: 137	Post Options Post Reply Quote tloftus Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 6:38pm

	1966 AMC Rambler American Rogue - 232 I6

tloftus Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List AMC Apprentice Joined: Mar/18/2008 Location: Iowa Status: Offline Points: 137	Post Options Post Reply Quote tloftus Report Post Thanks(0) Quote Reply Posted: Sep/14/2011 at 7:27pm
	I am not having any luck blowing through that hole. There is two orfices that it can come out of so it's difficult to keep them both plugged to see if anything is coming out this tiny hole. But judging by the picture, wouldn't you think a guy should be able to stick a sewing needle through there?
	1966 AMC Rambler American Rogue - 232 I6