Welcome to the CJ-3B Bulletin Board, the discussion forums section of the website CJ3B.info. Everyone is invited to view the postings here, but you must register as a member in order to post messages. The moderator reserves the right to remove items posted. Items may be archived in the Tech Tips section of the website. If you post a tech problem, please follow up by posting the solution when it is found, as it may be useful to other readers. For forums covering other Jeep models, see the bottom of this page.
Search for keywords or phrases anywhere in the CJ-3B Bulletin Board using Google. Enter key words here.
| You're currently viewing the forums as a guest. This means there are some features you can't use. If you register, you'll be able to post messages and use member-only features such as customizing your profile and sending personal messages. Registration is simple and free. Join the CJ-3B Bulletin Board! If you're already a member please log in to your account to access all of our features: |
| AC Fuel Pumps | |
|---|---|
| Tweet Topic Started: Aug 19 2013, 08:44 PM (420 Views) | |
| NMgamewarden | Aug 19 2013, 08:44 PM Post #1 |
|
Member
![]() ![]()
|
My first post to this forum and I have a question about fuel pumps. I am going to restore/repair my 61 CJ-3B and I would like to replace the non-vacuum fuel pump with a original AC dual action fuel pump. I have searched and I can not find much information on the different models of pumps. I have found references to the AC 4693 and AC 4032 pumps, what is the difference between these two models? Any pump better than the other? Which one was original to the 1961 CJ-3B? Thanks for the help! As is usual, after posting my questions I found the answers to most of my questions in a random web search. I do still have one question, what is the " pillow block cam" on a AC 4693? any pictures or diagrams? |
|
Pat Retired Game & Fish Las Cruces, NM Restoring a 61 CJ-3B | |
![]() |
|
| oldtime | Aug 20 2013, 10:13 AM Post #2 |
![]()
MODERATOR
![]() ![]()
|
Pat, Welcome to the CJ-3B Bulletin Board I'm currently not aware of any pictures that show detail of an AC 4693. Most all AC 4693 were equipped with a sliding type journal block. None of the other AC fuel pumps for Willys 134 engines include this particular feature. The AC 4693 sliding journal block itself is composed of dissimilar metal in order to reduce friction. As you know a "block" generally is considered as being square. A "journal block" has a concave curvature. This curved face of the block rests upon some sort of rotating journal. In this case the journal has an eccentric profile; he cam lobe. For this reason the journal block must have a capacity for transverse or lateral motion. A sliding journal block is capable of following the motions of the rotating cam lobe. For more information try searching: slding journal block |
|
Currently building my final F-134 powered 3B . Rock Crawler using factory parts from the Willys Motors era (1953-1963) http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new | |
![]() |
|
| NMgamewarden | Aug 21 2013, 08:17 PM Post #3 |
|
Member
![]() ![]()
|
Thanks for the information, Oldtime! Looks like I have an AC 4693 without a sliding journal block. |
|
Pat Retired Game & Fish Las Cruces, NM Restoring a 61 CJ-3B | |
![]() |
|
| oldtime | Aug 22 2013, 10:51 AM Post #4 |
![]()
MODERATOR
![]() ![]()
|
Yes I've seen a few AC 4693 without. Also the sliding journal blocks occassionally fall off. Post pics if your able. As you know the AC number is normally found on the edge of the mounting face. |
|
Currently building my final F-134 powered 3B . Rock Crawler using factory parts from the Willys Motors era (1953-1963) http://s4.zetaboards.com/CJ3B_Bulletin_Board/topic/30228766/1/#new | |
![]() |
|
| « Previous Topic · CJ-3B Posts · Next Topic » |



![]](http://z4.ifrm.com/static/1/pip_r.png)




7:24 PM Jul 10