another carberator question 74 cj5 304

I'm having trouble getting a rebuild kit for my motorcraft 2100 . both carquest and 2 napa stores say that the 2100 is a model number and to get the correct kit there should be some more numbers. There must have been a tag that is now missing. Could someone with a similar year model post your tag info, or post the napa or carquest part number for a rebuild kit for a 1974 cj5 with a 304 that has a motorcraft 2100 carb. I bought a kit yesterday with a napa number from this site, the kit was for a ford with a 2100/2150 carb. but the powervalve was different, It screwed in but had a spring loaded button on the end that goes into the bowl and wouldn't hold the gas out. What does the power valve do ?
Many thanks for any responses , Kirk

 

one more question, I put a new speedometer from quadratech on and it works for about 10 minutes each morning then quits, what is the problem with it ? I've checked both ends of cable and it is secure thanks Kirk

 

Mine is in need of a rebuild as well. Here is a link to a table full of numbers:
http://www.carbkitsource.com/carbs/catalog/AMC/AMC.htm

 

For my 74 I bought a kit for a "4DM2" carb.

According to the manual the first digit is year, then engine, then trans, then venturi...74...304/360...Manual...2 venturi.

It has a 2 stage power valve. I had really good luck with doing a google search on the web for "2100 rebuild". I used the second hit on the list (a PDF file).

 

The power valve enriches the mixture at wide throttle, low speed. At other times it's held closed by engine vacuum.

A '74 could have a single-stage or two-stage valve. The depth of the cover will determine what you should have. The shallow cover will only work with the 1-stage valve, while the deep cover is used for the 2-stage valve.

Likely you have a 2100. If you post a picture taken directly above the carburetor, I can tell you if it's 2100 or 2150.

If you have a 2100, any kit for a Jeep 2100 from that year will work, as long as it has the right power valve. The kit will come with an internal bag or a shrink-wrapped box that lets you see the parts before you buy. I suggest you inspect whatever kit you get to make sure it has the parts you need.

 

Also, different makers of the power valve will have different designs, so just because it looks different, does not mean it's wrong. The 1-stage and 2-stage difference is really obvious though.

 

thank you for all the responses, Tim , I saw an earlier post by you with pictures of 2100 verses the 2150 and mine is a 2100, I think it has a single stage power valve. The kit I got had the wrong power valve. It screwed in but leaked gas out so the bowl wouldn't fill up, I put the old one back on and it runs good. Napa is currently looking for the spacer under carb next to intake manifold. Mine has one of the bolt holes broken off.
Why does the speedometer only work for a few minutes? thanks Kirk

 

is the cable free take both ends off and see how it spins...

 

I presume you have the spacer that uses the 3/8" thick 'gasket' that sets into the hard plastic spacer. I don't know of any aftermarket source. You can substitute a solid phenolic (plastic) spacer from a Ford, and use two of the thin gaskets. That's what I'm using on my J-10 with a 2100. The spacer was a California junkyard item.

Here's an aftermarket source for a spacer http://www.dashman.net/product.html?id=120 - it says "six pack" so I guess you get three of them for the price.

 

Regarding the speedometer, could be that the cable core is too short. You can get a kit to replace the core.

 

I would remove the cable assy and pull the core. Inspect both ends of the core which should be square on both ends. Spray PB Blaster inside the casing (flood it) and blow air thru to remove the old grease. Clean the core good and apply petroleum jelly (vaseline) on the core using a heavy application as you work the core into the casing.

 

thanks for all the advise, I unhooked the speedometer cable behind speedometer and pulled cable out where i could see it. It spins all the time while moving, so how do I tell if cable is too short or if speedometer is bad? The cable and speedometer are both new, purchased from quadratech.

 

the gear in the transfer may be worn as well when the gear oil warms up the gear slips.