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AC Fuel Pumps
Topic Started: Aug 19 2013, 08:44 PM (420 Views)
NMgamewarden
Member
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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
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oldtime
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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
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NMgamewarden
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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
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oldtime
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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
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