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Home > Technical > Holley Carburetor Technical > Holley 4000
 

Holley 4000

- Holley 2140 & 4000 Specificatons
- Questions & Answers
 

Holley 4000

Holley 4000 Identification - The carburetor number is located on the back side of the carburetor on the face of the flange. There may be multiple numbers, but the important one is the LIST number. I.E. LIST 1161. In a few cases the numbers after the list number can be significant
. I.E. 1161-1A

Holley 4000 Rebuild DVD

Holley 4000 Instruction Sheets
Holley4000 Visual Instruction Manual
Holley 4000 Carburetor Manual Holley 4000 1955 Newsletter
Spring Loaded Needle & Seat
The type of needle & seat which works with the spring-loaded retention system is no longer available. However, the needles used in them are identical to those used with the threaded seat. Some kits contain instructions to simply use the new viton-tipped needle in the original seat and discard the new seat.What Does The Spark Control Valve Do?The spark control valve in the passage from the throttle bore provides an efficient degree of spark advance during periods of acceleration by momentarily providing a partially retarded spark. This partially retarded spark minimizes detonation, or pinging and increases engine responsiveness while accelerating. In effect, the spark valve provides an intermediate spark advance curve between a fully retarded spark and the normal spark advance which would be excessive when the engine is suddenly accelerated. The spark control valve accomplishes this by controlling the manifold vacuum admitted to the distributor vacuum line.
Removing stuck discharge nozzles.
Holley 4000Refer to #30. Please note before doing this that you can distort or crack the bowl housing. Take your time and be very careful. Grind the tip of a screwdriver tip to fit into the keyhole-shaped recess in the top of the discharge nozzle. Try to move the nozzle back and forth, but take your time with this. Any movement at all is a sign that they will probably come out if you work them long enough. Sometimes adding some heat will help. Now using a sharp blade or awl tip driven into them above the "duckbill", as horizontally as you can, pry against the adjacent casting.

Holley 4000 Carburetor Kits

Here are the various kits that we have for the 4000. There are subtle differences in the kits, so be sure to use the carburetor number and match to the list contained in each carburetor kit.
Ford Lincoln 1956-57
1953-54 Lincoln
1955-56 Ford Lincoln

Needle & Seat


Some of the Holly 4000 carburetors used a needle and seat assembly that has no threads. Our kits have threads on the seat, which replaces the non threaded type. Simply place in the hole ignoring the threads.

A customer reported a problem where the drivers side air fuel mixture screw didn't change the engine speed. This was after the carburetor was rebuilt.

Answer:
It is probably a vacuum leak due to a bent "boot" at the front of the bowl. You see, one side of that boot has a cast-in breech tube for the idle circuit (which recesses into the idle passage), the other does not -- makes no sense whatsoever, but there it is. I'll bet that it is the side without the breech tube which is causing problems. Put 1 or 2 more gaskets under the boot to see if that will solve the problem without lifting the front of the bowl too high to seal to the choke air horn. Using a very thin coating of Permatex Anaerobic Gasket Maker around the gaskets' passage holes can't hurt, either.
Holley 4000 Flooding

At idle is your vehicle blowing black smoke, or running in a rich state, (maybe you smell the un burned gasoline)? This article may be for you.

I will bypass any discussion about the electrical system and assume everything, i.e.the timing is perfect. I say this because the carburetor is often blamed 1st when in fact it should be considered last.

Running in a rich state has two basic possibilities. The carburetor is in a flooding state, or there is a vacuum leak. For the vacuum leak you can spray carburetor cleaner around the mounting flange gasket, intake manifold and around any fitting, or line connected to a vacuum port. If the engine RPM smooths out, then you found your problem. Assuming there is no vacuum leak, then the most likely cause is the carburetor is flooding. In simple terms, flooding means that there is too much fuel getting into the manifold. Here are some things to check out. Eliminate each one carefully.

  • Check the float level. Measure both floats. They need to be the same.
  • Recheck your specifications for the correct setting.
  • Test your float for leaks. Heat a pan of water and when very hot (not boiling), immerse your float in the water and look for bubbles. When heated up, the air inside your float will try to expand and if there are any holes, the air will escape causing bubbles. The smallest of holes will show up this way
  • Did the spring that sits under the float get re installed?
  • Make sure the gasket was installed on the seat.
  • Check the action of the float by moving it up and down and observing the clip that holds the needle to the float. These can get turned the wrong way and cause the needle to bind.
  • Make sure the needle and seat are clear of any dirt. It isn't unusual for dirt to re-enter the needle & seat after a carburetor rebuild. On the 1st start up after the rebuild, dirt in the fuel line will rush into the carburetor. Spray plenty of silicon spray lubricant through the needle and seat to get it cleaned out.
  • Check the air bleed holes in the top of the float bowl cover to make sure they are not restricted somehow.
  • Make sure the choke plates are opening fully.
  • Make sure the secondary valves are closed at idle.
  • Check for any restrictions in the air cleaner. Plugged air filter for one.
  • A bad power valve will allow extra fuel in the system when not needed. This can be checked by removing the power valve and blowing through it while pushing and pulling the stem in and out.
  • Make sure the power valve diaphragm is working. High vacuum at idle will make the diaphragm stem to pull up away from the power valve. If for any reason the vacuum is restricted to the diaphragm, or the diaphragm itself isn't working, then the power valve will be open at all times and should be open only at higher rpm.
  • A gas tank vent that is stopped up will cause gas to be forced past the needle & seat.
  • A fuel pump with too much pressure will force too much fuel into the carburetor. This is especially suspect if they pump was recently replaced.
There may be a few more things I haven't thought about, but this should give you plenty of things to think about. Also, the history of the carburetor should give you some hints on where to start. If this situation started only after you rebuilt the carburetor, then obviously the problem is probably related to something you installed, or forgot to install.
What Does The Spark Control Valve Do?
The spark control valve in the passage from the throttle bore provides an efficient degree of spark advance during periods of acceleration by momentarily providing a partially retarded spark. This partially retarded spark minimizes detonation, or pinging and increases engine responsiveness while accelerating. In effect, the spark valve provides an intermediate spark advance curve between a fully retarded spark and the normal spark advance which would be excessive when the engine is suddenly accelerated. The spark control valve accomplishes this by controlling the manifold vacuum admitted to the distributor vacuum line.

Watch a video about the Holley 4000 Choke Housing

Watch a video about installing an electric choke
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