2150 carb

Hi,
I ordered a Motorcraft 2150 rebuilt carb from e-bay to replace the crappy *** Carter I had on my CJ7 and it runs rich now , the plugs are sooty and black smoke comes out of the exhaust. It is noticably better than the Carter carb but I was wondering what is the best way to fix the rich mixture on this carb. I set the timing to 9BTDC and the idle is OK . All ports are used or capped. The jetting SHOULD be right for my elevation .

I was wondering if I adjust the float would that be the answer? If not what . If it is the main jet or needle valve , where can I get those parts?

Thanks

 

Have you rebuilt the carburetor? I'd guess you have a blown power valve if you have not rebuilt it.

Jeep 2150s often have an altitude compensator, which would make the altitude moot to performance.

Mixture is adjusted by changing the main jets in the bottom of the float bowl. They used to be available from Earl Parker Carburetion, but I understand he took a full-time job somewhere and is no longer selling parts. You'll have to search for a source (but you shouldn't need jets IMO).

 

yes it has been completely rebuilt ( by others) so I suspect the float is too high. I will try that first before I go searching for jets.

 

If the carb was represented as rebuilt and in good working condition, I think you should contact the seller.

 

If you do need jets, I bought mine here. Fit great, no problems.

http://www.carburetion.com/ford2v.htm

 

look at the side of your carb. Does it say 1.08 on it or larger? Take the top of your carb off and look at the number on top of your jets. is it a 47 or a 48?
nathan

 

I'm assuming you have a 258 in your CJ7.
It should definitely be a 1.08 venturi.
Notice the casting on the side of the bowl.


Otherwise your mixture will be off. This can't be changed, so you would need a new carb.
If you look carefully at the jets at the bottom of the bowl they will have the orifice size printed on them. For a 258 I believe it should be a 46, maybe a 47 for high altitude.

As Tim mentioned, its probably a bad power valve leaking too much fuel into the intake.
I've got a shot of one below, they are easy to replace and can be had from any good FLAPS.

Notice the shiny place in the top middle, the cover and Power Valve have been removed


Shot of the old power valve I removed. The sides are squared off so you can unscrew it with a wrench.

 

Just a nit - the jet size gets smaller with higher altitude, not larger. The number is the hole size in 1000ths of an inch.

 

I checked the venturi size and it reads 1.08. Then I pulled the top off the carb and checked the jet size . It reads 47F. I don't know what the F stands for but what should the correct size for this be? I had to use a super magnifier to see it down past the float thru the gas. There were two of them but only one had the numbers on it.

The engine is a 258 6 cylinder and I am at sea level.

 

Thanks Tim, you're right, my bad.
Not a nit, good info, smaller number = smaller jet.

Obviously, you may just want to send the carb back if you paid a premium to have it rebuilt and setup for you.

But if you don't want to do that . . .

1) Check the float level.
2) Then replace the power valve.
Its cheap and easy. Heck, you could just buy a rebuilt kit if you're going there, it will have the PV, new needle seats, accelerator pump diaphragm, and all the gaskets.
3) Then you could try using a 46 jet.

 

Oh, and be forewarned.
Old Jets don't like to come out.
You will destroy them taking them out. So don't bother if you plan on reusing them, clean in place.
I had to grind down the end of a small pry bar to fit snug in the slot to remove the jets.
The jets are made out of brass and deform/crack easily. I big screwdriver won't do it, you need something flat and wide that fits in the slot really well, and then turn it with a wrench on the handle of your new ground down "jet tool".
And not much force is needed to snug in the new one either. Think "Oil Filter".

 

Thanks for the quick reply. My power valve has an internal vacuum as opposed to a port attached to it.

I read somewhere that to test the power valve , at idle , just plug the three bowl vents with anything and see if the engine starts to sputter . That is the indication that it may be leaking past into the venturi causing too rich a mixture. I tried that and it didn't sputter or turn off.

I keep working on it and replace the valve if I can find one close by anyway.

Maybe try advancing the timing 2 dgrees to say 6 BTDC.

 

I sprayed carb cleaner around the base and found a leak. So I pulled the carb off and looked closer and found a crack in the cap. You can see light coming thru it when I hold it up to the sky. OK, so I JB welded it back together (temporarily) and replaced the carb for another test. The leak stopped but the plugs still ran black and sooty.

I repeated the float bowl test , plugged all 3 vent holes and this time the engine died, indicating a badly worn power valve piston. I will replace it as soon as I can get the new cap and valve.

Figures , just in time for the weekend.

 

safecracker,

I have a couple of spare power valve covers if to a 2100/2150 if you want one. They are both in good shape. just cover shipping cost and its yours.

nathan

 

Looks like he needs the deep one ...

 

the deep one that I have has a port on it. might not be of much use to you.

nathan

 

Thanks Nathan,

I did get the new valve cover and it is the small one so it is fine now. I replaced the power valve and cap , checked for leaks and I am good now. I took it for a spin and it still runs rich fouling the plugs.

I am wondering if this is the correct carburetor for the engine. It has the 47 F jet. It will idle perfectly but now it sputters when I drive it more than 15 MPH. It almost sounds/feels like it is missing. but the plugs tell me it is carburetion problem. It runs , just rough and it STILL fouls the plugs!!

Ok , what the heck is the problem now?

Is it the jet size? It's a 4.2 liter at sea level.

What is the correct jet size for that application? I don't know where to find this out.

Maybe it is the float level?

I don't have alot of hair left so I am hoping someone will know...

 

you can check the float level but I don't think thats it. The way I checked mine when I rebuilt it was that I had the float even on both sides with the top of the carb when I wanted it to shut the fuel off . There is a measurement but I don't know It and mine has never given me a bit of problems. Your jet size should be fine. Is it just rich on a few of the plugs or on all of them? Thats about all I can help you with.
nathan

 

The plugs are fouled on all 6 plugs.

The float is set to 19/32 inch.

Maybe I should try a 46 jet size.

Or maybe a fuel pressure regulator but I have not been able to find an inline adjustable regulator for reasonable amount that can be set to such low pressures.

I have read alot of information on the 2150-2 carb but nowhere have I read any troubleshooting tips guide for dummies. Maybe I need to start one.

 

I just put this regulator on my jeep, works very well.

http://store.summitracing.com/partd...part=HLY-12-804&N=700+300725+115&autoview=sku


It has one inlet and two outlets. Kinda nice, you can either plug one outlet or use it for a pressure gauge.

Don't get dial style regulators. Can't keep them from leaking.