To clarify where we are:
From Bill:
Just finished pulling the pump.
Model # M50 2/4A-80A-9540A
SER BE 56948
I have the AMBAC exploded view with parts ID info. Not sure what issue I am looking for, but know that there are things I don't want to disassemble if I don't have to. Would sure appreciate any thoughts you have on how to proceed.
Bill,
If you can get it apart, the item I suspect is the "bow-tie washer" plunger guide, #26 if we are referring to the same diagram. Either the plunger shaft or the guide (bow-tie" is likely broken. It is hard to get these IPs apart to that level but it can be done. I service these pumps for $100 plus parts, if anything is broken. Let me know if you are doing it yourself. Get the -34 TM to help you.
Jerry
Bill,
First, you have to get the cap off. (Not big on terminology) I use a stainless hose clamp to grip the round cap and just carefully pry it up until I can pull it free. Rubber o-ring provides resistance. The button under it is easy to get out, just take a jeweler's screw driver go across the slot in the button carrier and compress the thin split ring, protect with your hand. you can slide it around easily and get at it from 2 sides. The big challenge is getting the 2 half rings out from below the head of the plunger shaft. A special tool is necessary to do that and you can't go further unless you remove them. A drill press is also necessary so you can compress the spring, hold it in compression, and fish out the half rounds with a magnet
A way to make a field expedient tool is to use a 1" dowel. Cut the center out so edges clear the part with 47 on it and compress the spring without taking the whole mechanism down. Can't be done with screw drivers without 4 hands and stabbing yourself. I used the dowel for a while then had a special tool made by a machinist. Again, if you don't have access to a drill press, you can't control the tool and lock it in place to allow you to fish out and later replace the half rings.
I've attached a picture of both my early tool and current one.
Once past the half rings, the rest is pretty straight forward.
Good luck.
Jerry
BTW, the special tool was made by a fine member of this site njtoolnut, who might also be able to make one for you.