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What is the dry float setting and main jet size for an original Motorcraft carburetor with AMC tag #9DM2!

Tiny
GORDO22
  • MEMBER
  • 1979 JEEP CJ7
  • 5.0L
  • V8
  • 4WD
  • MANUAL
  • 65,000 MILES
The carburetor I am rebuilding looks to be a model 2150 and was factory installed in 1979. The tag also has the following; C 9A 16, and the venturi size is 1.08. The Jeep CJ7 has the Renegade package, and the optional 4 speed manual transmission. Do you have the dry float setting, and also would the factory main jets still be a good size at 6,600 feet in elevation? The jet size numbers are unreadable, so would you also know the factory jet size? Thank You for any information you can offer!
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Monday, January 20th, 2014 AT 7:18 PM

14 Replies

Tiny
HMAC300
  • MECHANIC
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You'll have to go to a carb shop for jet size but should be ok. See pics for settings.
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Tuesday, January 21st, 2014 AT 6:13 AM
Tiny
GORDO22
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Thank you very much for this information Hmac300! The rebuild kit should arrive in a few days, and I can put the carburetor back together then. The information you provided is for a model 2100, so this 9DM2 carburetor must be a Motorcraft 2100, instead of a 2500? The back edge if the base is straight across.
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Tuesday, January 21st, 2014 AT 9:35 AM
Tiny
GORDO22
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I had a typo in my last reply, so the 2500 should have been 2150.
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Tuesday, January 21st, 2014 AT 9:39 AM
Tiny
HMAC300
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Yes it's a 2100 the other model for jeeps is a 2150 which has a 9 h
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Tuesday, January 21st, 2014 AT 9:40 AM
Tiny
GORDO22
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Thank you for all your help, as it is very much appreciated!
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Tuesday, January 21st, 2014 AT 9:50 AM
Tiny
CJ MEDEVAC
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JUST TO BE IRRITATING!

I THINK YOU'D BE HAPPIER WITH A HOLLEY!

SO MUCH EZier TO MAKE JET (AND OTHER CHANGES QUICKLY)

MANY OF THE PARTS CAN BE FOUND LOCAL/ SAME DAY

AS FAR AS THE STOCK JETS AT ALTITUDE.....MOST LIKELY GONNA NEED TO STEP DOWN

THIS LINK MAY INTEREST YOU IN-SO-FAR-AS JETTING WITHOUT DOING HARD TO READ PLUG CUTS OR JUST WINGING IT

https://www.2carpros.com/questions/oxy-sensor-plastic-connector-gone-identify-unmarked-wires

I THINK I FOUND THE DIAGRAM YOU WANTED SHOWING ORIGINAL JET SIZES

OTHER PICS OF "MR. JEEP", MY '77 CJ 5 258 W/ 4BBL 390 HOLLEY (AT LEAST IF YOU WENT HOLLEY, YOU WOULDN'T HAVE TO GET ANOTHER INTAKE AS I DID)......AND A PIC OF "WILLY", MY '46

I'VE DONE MANY USER-FRIENDLIER MODS TO MY '77 AND UPGRADES LIKE A '79

NEED ANYTHING ELSE.....JUST ASK!

THE MEDIC

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Tuesday, January 21st, 2014 AT 3:45 PM
Tiny
GORDO22
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Hi CJ MEDEVAC:
I am working on my brother's 79 CJ7 that has been sitting for a few years, and won't start-up anymore. The carburetor bowl had so much sediment in the bottom that the main jets and power valve were mostly covered and blocked. So I am rebuilding it on the cheap, but want it to run right at 6,600 feet in elevation. I had contemplated a Holley 350 cfm model #7884 2bbl swap, but when I removed the original 2bbl Motorcraft carb, it had more vacuum lines protruding from it than I wanted to deal with, so I decided to rebuild the Motorcraft carb. I understand that everyone wants a four barrel carb for performance, but I can rebuild this one for the price of a carb kit (new old stock carb kit from ebay $21.00), and a few hours of my labor. Don't tell my bro, but I am learning to rebuild carburetors on his vehicles. Lol He also has an MB, and a 1949 CJ2A that has a Holley #1904 carb that was my first carb rebuild. I used to have a 1955 CJ5, 1965 Cj5, and a 1979 Jeep J10 pickup, but don't own any at present. We have always had a soft spot for the older Jeeps. I was not aware of the air-fuel gauge you have, but will keep that in mind. The carb specification chart you have is for a different venturi size than the one I am working on which has a 1.08 venturi, so I'm not sure if it applies. Thank You very much for all the helpful information!
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Tuesday, January 21st, 2014 AT 8:27 PM
Tiny
HMAC300
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One thing now that you have said about he sediment is touse choke cleaner as well as mineral spirits to clean this also have a fine wire like they use for shipping tags and go through every hole in the carb body. Then foolow through with choke cleaner and air pressure if available. The Motorcraft carb is one of the most reliable carbs that were on the market especially the two barrels. Much much better than a Holley could ever think of being unless for performance then there is no question to go to the Holley.
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Wednesday, January 22nd, 2014 AT 6:59 AM
Tiny
GORDO22
  • MEMBER
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Thank You CJ MEDEVAC for serving in the Army Rangers! I noticed the stickers on your Jeep CJ5 dash.
Hmac 300: I did not use mineral spirits, but I cleaned the carb with a parts brush, diesel fuel, acetone, Butch"s Bore Shine gun cleaner, and almost a full can of carburetor spray cleaner. I also used a thin flexible plastic coated wire in the passages that is used for necklace making, but I will double check the passages with wire, and compressed air. I wouldn't want to pull the carb apart again shortly after going through it. The fuel tank had been changed a few years ago as it had rusted through, so hopefully the fuel system will stay clean for a few years. The carb bowl is mostly clean except for a black coating towards the bottom. I will try the mineral spirits to see if that will remove the film. Thanks again for the advice!
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Wednesday, January 22nd, 2014 AT 11:28 AM
Tiny
CJ MEDEVAC
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I'M PRESENTLY SITTING AT AROUND 500-700 FT ABOVE SEA LEVEL HERE IN WESTERN S.C.

I'M GETTING CONSISTENT 18 MPG AND OCCASIONALLY 19, THE POWER IS THERE IF I NEED IT.....I DRIVE LIKE GRANDMA, I'D RATHER HAVE THE MILEAGE!

"MR. JEEP" JUMPED UP ON THE BLUE RIDGE PARKWAY AND TRAVELED TO PIGEON FORGE, TN IN JULY, A FEW YEARS BACK......ELEVATIONS THERE ARE 5000+ FT.........I KINDA WISHED I HAD CARRIED SOME JETS WITH ME (IT NEVER CROSSED MY MIND).....MR. JEEP RAN LIKE CRAP !

IF I'D BEEN STARVING FOR FUEL, I MAY COULDA PULLED THE CHOKE SOME.....AIN'T NO QUICK FIX WHEN YOU ARE STARVING FOR AIR!

I WAS REALLY HAPPY TO GET BACK HOME!

I'M GUESSING YOU ARE STILL SET UP WITH THE STOCK 1 INLET...2 OUTLET FUEL FILTER? SEE 1ST PIC

ANOTHER GOOD SOURCE FOR YOU---READ THE 1ST PART OF MY ANSWER IN THIS ONE

https://www.2carpros.com/questions/rear-oil-seal-on-transfer-case

THANKS FOR NOTICING MY FROZE MY STARVING BUTT OFF WHILE WIDE AWAKE MOST OF THE TIME RANGER TAB UPON MY DASH....THAT WAS JUST PART OF IT (4 MONTHS WORTH IN RANGER SCHOOL) I SPENT MY ENTIRE FOUR AND A HALF YEARS AT 1ST RANGER BATTALION.......... WOMEN REFERRED ME TO AS THE "BATTALION STALLION"....LOL!

A FEW PICS FROM MY PRESENT DAY MAN-CAVE BELOW...KEEP IN MIND '82-'87 WHEN I WAS IN, ONLY RANGER BATTALION RANGERS WORE THE BLACK BERETS.......LATER THEY JUST HANDED 'EM OUT TO THE WHOLE ARMY AND RANGERS STARTED WEARING KHAKI BERETS

KEEP ON ASKING--UPDATING US--WE'LL BE HERE

THE MEDIC
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Wednesday, January 22nd, 2014 AT 8:51 PM
Tiny
GORDO22
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  • 17 POSTS
CJ MEDEVAC;
It looks like you have the master plan well handled with a awesome family, the ultimate man cave, Mr. Jeep, and Mr. Jeep senior. I can easily see why they call you the Battalion Stallion! I retired from the ARNG after 25 years of service, made it up to SFC at battalion 54B-40 NBC NCO. I also didn't approve of the army passing out black berets to the masses either. The Bob2000 site is going to be on my favorites list, as I am much more up to speed with fuel injection than the inner workings of the venerable carburetor. My daily driver is a civilian 1983 Chevy K5 blazer with a 6.2l diesel, that is very similar to the military CUCV.
On the flat side of the venturi body are two tiny holes which lead to the two venturis. I could get a fine wire through one of them, but the wire only goes in about 1/4" into the other one. I can feel air passing through, so I am thinking it is ok. When I took the carb apart the mixture screws were not adjusted anywhere near the same, and one side of the venturi body by was by far more corroded than the other. I will keep you all updated on the progress with the CJ7 carburetor build.
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Thursday, January 23rd, 2014 AT 10:50 AM
Tiny
CJ MEDEVAC
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Ok. So verify you saw the "morris" stuff I sent previously. You fully understand where to go and the wealth of info that is there?

Let's get it straight, we have "willy" and "mr. Jeep" on this end. The previous five cj 5s bore masculine nomenclatures also. No "sissys" in my fleet!

Back in '83, savannah, ga, at the amc dealer, I obtained my 1979 after losing a "bout" with an 18 wheeler with my 1st 1977. It was two-toned, w/ 304, whoever installed the hood decal was an idiot. In fact, I liked the color scheme so well, I sorta copied it when I painted present day '77 w/258 "mr. Jeep"

. Even though I was "t-boned" from the passenger door on back. He still made it back to hunter army airfield under his own power.I had a concussion, being a ranger, I made it back to hunter too! When I arrived and passed out in the parking lot, my ranger buddy got me me to the hospital

. Anyway, after getting the '79, (sorta "root beer" in color) I found."Mr. 1979 amc/ jeep service manual" under the back seat

I sorta didn't take real good care of it, it got tossed around hither and yon. Till I figgered out how precious it was!

Now it lives in a folder and is gently handled!

I just found thisin your writing, 2 tags were mentioned

Pic 1)look at these tag numberslook at the carb model. Need more info on that carb. The book shows it all! Adjusting and all!

Pic 2) like my scanned/ enlarged/ painstakingly colored/ and laminated '79 wire diagram?

Pic 3) some of my other references

Pic 4-5) my '79 amc service manual

Pic 6) jeep #1

Pic 7) jeep #2

I can already tell there is no doubt that you love 'em too!

Thanks for hanging the whole term.1st wifey could not deal with it. Wish I had dx-ed her instead of battalion!

The medic
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Thursday, January 23rd, 2014 AT 5:51 PM
Tiny
GORDO22
  • MEMBER
  • 17 POSTS
Hello Hmac300, and CJ MEDEVAC;
I wanted to update you both on the MC 2100 carburetor status. The rebuild is complete and installed on the CJ-7. The motor did not start due to the fuel pump leaking the fuel into the crankcase, so I am busy fixing that issue. I will likely need to go through the whole fuel system to find any other issues. Thank You very much for your awesome assistance with the carburetor rebuild.
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Wednesday, January 29th, 2014 AT 6:26 PM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Well!

I finally got this notification just now!

Is it still running good?

Do you have any more Jeeps that you acquired in the past 6 years we were apart?

Here's a few of the latest of "WILLY"

The Medic
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Thursday, October 29th, 2020 AT 5:29 PM

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