Help with starting...ID problem.

jchochole

jchochole

Senior Member
I have been working on starting my '27 Tudor with an NH carb. Here's what happens..

1. if I leave the car alone for an hour or so, it fires right on bat with a starter. It'll run decently for about 3-5 minutes with gas and spark open about half way down, while running I cannot close the levers much or it'll begin to miss and sputter. I can get about 1/4" down and if I close her more she'll start slowing dying.

2. then after the 3-5 minutes of running, it sputters and dies. Once that happens I cannot start it again. It'll hit and fire on a few cylinders irregularly and choke. Once this happens it starts popping and coughing and I cannot re-start it for about an hour later.

Can someone help me ID what you think it may be? Gas comes out the bowl, filler hole is clear, wires are new and not frayed or damaged.

Thanks in advance,
Jim from IL
 
Update...I did the spark test on each cylinder and they all fired well.

Had the car going for 5-7 minutes and then died...won't idle at lower speeds, I have to have both levers 1/2 down to keep it going. Does the same on battery and magneto. Lots of thick exhaust and my plugs are pretty black and carboned up when I took them out..is this a fuel/carb issue?

Any ideas?

Thanks,
JIm
 
jchochole,
Is you gasoline fresh? definitely carb/fuel issue. Sounds like running rich, and then when warms up is fouling out. Could be adjustment on carb or sticky shut off valve in carb bowl.
 
jchochole,
If you are OK with do-it-yourself work, I would definately buy a carb rebuild kit from Mac's, Snyder's, or Lang's. If not, there are rebuild shops that could do it for you, or you can purchase a rebuilt carb for your specific year. Your '27 should have a filter screen in the shutoff valve. If that screen was removed, rust or particles could be making their way to the carb. In any case, drain and clean everything from the tank to the carb.
Good luck.
Skip
 
Thanks for the tips...turns out when I inspected the manifolds..the intake manifold (even when tightened down) was showing gaps in the rings, I mean actual holes. I had bought a used intake and will trade up to a new one. My exhaust manifold is new and doesn't like to seat with a used intake.

Does that make sense...so when I was running the car it was sucking air into the motor and eventually stalled it out as I lost compression.

Definitely an issue...

Thanks,
Jim
 
If you do some work with the carb be sure to check and see if the throttle shaft is sloppy, that will make the car not able to idle well but not effect the high speed running
Larry
 
Hey, everybody here has been great and I really appreciate all the help. I found that my intake manifold (which was old) had bad gaps at the tops of the ports so I got a better one which tightened right up- no air gaps.

Today, I tried to fire it up and it'll pop quickly 3-4 times and then nothing. I keep opening up the carb and still...pop a pop pop...and dies. After a few more carb turns I get gas spitting out the back of the carb.

What gives? Any new insights...trying to work it but struggling.

Thanks in advance,
Jim from IL
 
Open the drain on the bottom of the carb & make sure you have good fuel flow for a while. Often a restriction will show up after a few minutes. If the flow is consistant the problem is likely the carb needing cleaning.

SEARCH; 26 NH carburetot (yes it is a typo on the thread) Tmodelman posted some good pictures of your carb. & information on how to clean it.

If you could borrow a known carb it would tell you a lot.

As Larry suggested, check the throttle shaft for excessive wear. This can cause idling problems - very thick grease placed around both ends of the shaft will cure the problem very temporarily but will tell if it is indeed a problem.
 
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With all the great tips..I am going to just buy a new rebuilt carb. I got the car running if I only opened the gasline about 1/2 way and could only keep the car running if the levers were 1/2 down the quadrants...it refused to idle. My carb is old and loose all over. I think the best bet is to start fresh!

Thanks for all the great tips!
Jim from IL
 
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