Nikki Rebuilt: Odd issue
#1
Nikki Rebuilt: Odd issue
So I rebuilt my Nikki in anticipation of dropping in a rebuilt 12a. I had this issue before I rebuilt it too, but it's gotten more complicated.
Before pulling the motor that spun a bearing (it was a bad year for Jim and 12a's...) I noticed that my secondary barrels were filling with gas when I was cranking the motor. I found this very odd, and so I decided to rebuild the carb to see if there was something sticking.
It took me about 2 months to rebuild the carb, as I could only put 30 or so minutes a week (at most) toward work on my 7 (graduate school, girlfriend, and work makes personal time non-existent...). I have the motor in the car, carb on the manifold and everything is plumbed.
I check fuel levels in the sight glasses, and I have fuel in the rear sight glass. None in the front sight glass.
Tap front bowl with a dead-blow hammer to see if I have a stuck needle. Nothing.
I pull the top of the carb off, and notice that there is fuel up to the bottom of the sight glass, but it's funny colored (kind of a green color...)
Replace the top of the carb, turn the key, and I have a slight fuel leak. Fix that, and take a look at my sight glasses. No dice, or so it seems...
There is a bubble at the TOP of the front sight glass. Both fuel bowls are completely filled. WTF.
No fuel is traveling to the accelerator pump. No fuel is going into the primary barrels when I actuate them manually at the carb.
I crank the motor over with the key to see if the secondary barrel issue is still there, and it is. They fill with fuel almost immediately.
I think it started after I unhooked the wiring harness that connects to the passenger side of the carb. What does that plug actuate? Could that be causing this issue?
I dug out that wiring harness and re-connected it, but now I need a new battery, so any more testing will have to wait until I start my new job next week (back working as a Research Intern...DGRR2012 here I come...).
Just to re-iterate: There is fuel going into my secondary barrels when the BUTTERFLIES ARE CLOSED. No air is traveling through the venturies to pull air into the barrels. This was happening pre-rebuild too.
Before pulling the motor that spun a bearing (it was a bad year for Jim and 12a's...) I noticed that my secondary barrels were filling with gas when I was cranking the motor. I found this very odd, and so I decided to rebuild the carb to see if there was something sticking.
It took me about 2 months to rebuild the carb, as I could only put 30 or so minutes a week (at most) toward work on my 7 (graduate school, girlfriend, and work makes personal time non-existent...). I have the motor in the car, carb on the manifold and everything is plumbed.
I check fuel levels in the sight glasses, and I have fuel in the rear sight glass. None in the front sight glass.
Tap front bowl with a dead-blow hammer to see if I have a stuck needle. Nothing.
I pull the top of the carb off, and notice that there is fuel up to the bottom of the sight glass, but it's funny colored (kind of a green color...)
Replace the top of the carb, turn the key, and I have a slight fuel leak. Fix that, and take a look at my sight glasses. No dice, or so it seems...
There is a bubble at the TOP of the front sight glass. Both fuel bowls are completely filled. WTF.
No fuel is traveling to the accelerator pump. No fuel is going into the primary barrels when I actuate them manually at the carb.
I crank the motor over with the key to see if the secondary barrel issue is still there, and it is. They fill with fuel almost immediately.
I think it started after I unhooked the wiring harness that connects to the passenger side of the carb. What does that plug actuate? Could that be causing this issue?
I dug out that wiring harness and re-connected it, but now I need a new battery, so any more testing will have to wait until I start my new job next week (back working as a Research Intern...DGRR2012 here I come...).
Just to re-iterate: There is fuel going into my secondary barrels when the BUTTERFLIES ARE CLOSED. No air is traveling through the venturies to pull air into the barrels. This was happening pre-rebuild too.
#2
that is weird it almost sounds like a check valve gone bad. Are you on mechanical secondaries or vaccum?? Also does the car start and just fill the barrels or does it not start?? Also what year is ur car as the nikki did have minute changes over the years.
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#9
search for the fuel bowl vent solenoid, if this isn't hooked up you will get flooding after the engine is turned off and left for a while. the problem then crops up on start up, the next day or whenever it happens to be.
#14
So I was thinking about another thing:
when I went to put the top of the carb back on, i saw that there were two pointed cylinders that were hanging from the top of the carb. What are they? I'll snap some pictures of them and put them up tomorrow when I have internet access again. Two of them came with my rebuild kit...
And what would be causing the AP nozzles to not squirt fuel? I soaked the nozzle in ChemDip to clean it...
when I went to put the top of the carb back on, i saw that there were two pointed cylinders that were hanging from the top of the carb. What are they? I'll snap some pictures of them and put them up tomorrow when I have internet access again. Two of them came with my rebuild kit...
And what would be causing the AP nozzles to not squirt fuel? I soaked the nozzle in ChemDip to clean it...
#15
Don't Cross The Streams..
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mine does the same thing sort of.. it was dripping steadily when idling... buddy told me it was a vacuum leak, turns out it was and the accelerator pump was leaking, resealed it and the block off plate gasket for the air pump and it stopped..
as far as the bowls go i have no clue.... i have a terrible habit of breaking little connectors on the ends of things, nothing is plugged into my carb.. dont know if its right or not but it runs...
as far as the bowls go i have no clue.... i have a terrible habit of breaking little connectors on the ends of things, nothing is plugged into my carb.. dont know if its right or not but it runs...
#18
Rotary Enthusiast
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Also make sure you dont cap of the fuel vent hole itself if you removed emissions. It will floord you car horribly after driving and turning off. it would produce the same issue if the vent solenoid is not connected. Also when you rebuild a carb you take of every jet and you clean and dip all the components in cleaner and blow compressed air through it to make sure that nothing is clogged. good luck
#20
Also make sure you dont cap of the fuel vent hole itself if you removed emissions. It will floord you car horribly after driving and turning off. it would produce the same issue if the vent solenoid is not connected. Also when you rebuild a carb you take of every jet and you clean and dip all the components in cleaner and blow compressed air through it to make sure that nothing is clogged. good luck
Love the name. Hilarious.
#24
its supposed to do that
this may be worth a read:
http://sterlingmetalworks.com/the_nikki_carburetor.htm
#25
Alright, so I had my FB running again this weekend. It was warming up at ~4k rpm with the choke open. I was monitoring block temp with a Thermal IR gun ($50 at your local Ace hardware), and it only got up to ~175f.
I noticed that I was getting massive amounts of fuel in my secondary barrels (to the point where they filled completely with fuel and drowned my motor out). I pulled the electromagnetic solenoid on the passenger side of the carb, and it didn't actuate when I was turning the key from "off" to "on". What is this solenoid used for?
I'm kind of at a loss. Getting frustrated. I had read somewhere about using some QuickSteel and a penny to block off where that solenoid goes in. Is this something that is done often? What benefit would it give me?
I may have some time Friday night to work on her again. Any suggestions?
Thanks
-Jim
Also: I am not getting any fuel to my AP. I pulled everything apart and I have no blockages between my rear bowl and my AP. I have the proper weights and check ***** in (in the proper order) and still nothing.
I noticed that I was getting massive amounts of fuel in my secondary barrels (to the point where they filled completely with fuel and drowned my motor out). I pulled the electromagnetic solenoid on the passenger side of the carb, and it didn't actuate when I was turning the key from "off" to "on". What is this solenoid used for?
I'm kind of at a loss. Getting frustrated. I had read somewhere about using some QuickSteel and a penny to block off where that solenoid goes in. Is this something that is done often? What benefit would it give me?
I may have some time Friday night to work on her again. Any suggestions?
Thanks
-Jim
Also: I am not getting any fuel to my AP. I pulled everything apart and I have no blockages between my rear bowl and my AP. I have the proper weights and check ***** in (in the proper order) and still nothing.