1974 YF Carb Linkage

In the forum for 10-05-2005 there is a post by DanStew requesting info on accelerator cable linkage for the I-6/V-8, which jpflat2a promptly provided in the form of a jpg from (presumably) the Parts Manual:
View attachment 15675
I need the three parts identified in that diagram as 4.070-11, 4.080-2, and 4.070-6. Are these numbers "Jeep part numbers" or is there a lookup table in the Parts Manual (which I don't have) that cross-references these numbers to the applicable part number/nomenclature? :? Any info you can provide is appreciated.

John

 

John, those refer to the text of the parts manual where the Jeep part numbers are given. Even if you had the Jeep PNs, they are certainly NLA for a long, long time. Your best bet is to find a junk carburetor with the parts you need, or fabricate them. -11 is a little complicated, but you could make something equivalent. -2 is the return spring bracket, which you should be able to make a functional equivalent for, and the ball stud -6 is a standard carburetor part that you can get from a speed shop.

 

Thanks Tim, that's what I was afraid of. There are maybe two jeep graveyards within 75 miles, one of which (CrossRoads, 256-228-3632) checked everything he had yesterday and came up empty. If New Salem in TN is still operating I'll check with them today. If any of you see anything in your local places, give me a holler. Thanks.

John

 

I think the post you found was one that I started. I needed all of that stuff so here is how I got it.

They are all NLA and Jeep only used this until about 76, 77 78, or 79. Not sure which year but I had a hell of a time finding the parts. I went to a jeep JY to no avail.

I don't know why Jeep did it this way but they had a throttle arm on the carb and then bolted another throttle arm adapter on it. Problem is when someone replaced the carb they gave the old as a core and guess what??? Never took the throttle arm adapter off so they were forced to J.S. some other linkage setup.

Someone here sent me the throttle return spring bracket, but you should be able to fabricate something with flat stock and a drill. It mounts to the manifold through one of the EGR valve bolts. I had a buddy fabricate the other part that mounts on the throttle arm with two small screws and like Tim says speed shop for the ball stud.

Good luck.

 

Moral of that story - never turn in your core until you are totally, finally finished with the job and you've driven the Jeep for a while.

There are a couple of big Jeep-only yards in California that will ship to you: J&W (Antelope, near Sacramento) and Scottie's (Fontana, near San Berdo) - they might have your parts. I don't have time to search for the links right now, but if you can't find them, post a follow up and I'll look for them later this afternoon.

Good Luck! Tim

 

MACJ5 - Yep, I've been following your progress on the YF reinstall. Glad it's running good for you now. Thanks for the encouragement and good advice.

Tim - I was looking for links to the western salvage yards last night and found several. I'll be sure to check out J&W and Scottie's if the yard up in TN doesn't have anything. Thank you for posting this additional info.

Has anybody just fabbed a new manifold bracket or modded the original bracket so that it lines up with the existing YF linkage? Looks like you could then put a ball stud at the very bottom of the existing linkage and have the correct pull on the throttle plate. Any known pitfalls in this approach?

John

 

That does not work. I tried that approach there is not enough upward leverage (???) to move the linkage when you step on the gas. The result is a pedal that does not move. I don't have a digi camera so I cannot provide pics right now. The best way to do it is the factory way believe me...

I will say that once that little YF carb is cleaned, rebuilt, and tuned correctly it runs that motor really well. My 258 has plenty of get-up and driveability is reallly good. My only beef is that in real cold weather after several days or weeks of sitting my startup routine is this:

1.Hit gas several times
2.turn over motor for 8-10 seconds
3.hit gas again
4.turn motor over for 2 seconds and engine starts.

I wish it would start on the first round of turning over like my 304 did with the motorcraft carb. Good luck.

 

I think I see what you mean. DanG! Thanks for the info.

No answer on the phone up in New Salem TN and no response to the message left on his answering machine. Think he may just be opening up certain days of the week, but nobody I've talked to knows if he's even still in business. If anybody here knows, please come on line and let me know, so I can move on.

And yes, the Motorcraft is a good carb. My Wagoneer always coughed on the first crank and ran on the second crank. And gave me 15 to 16 mpg on the highway to boot, even loaded down with tools and equipment. If their power options (locks, windows) had just held up, I'd probably still be driving it.

John

 

Yes!!

It was a most excellent day. Made the 45 mile trip (beautiful, even in the rain) today from my home to Old Salem TN and found Old Salem Jeep Parts (931-469-7392, Mr. Parker Jones) still in operation, albeit in a new location. Scored the needed linkage and a complete but somewhat mangled choke heat stove pipe, complete with insulating sleeve, at a very reasonable cost. Should be able to fire the new-to-me CJ sometime tomorrow, as soon as I get the crud out of the old lines. Life is good!

John