Re: Pic Test; Packard & Olds Pumps

Posted by Joe Hall On 2007/8/26 15:41:53

The stock 56J pump does not have a bronze bushing. It is exactly like the Packard pump, except it has a flat plate instead of the vacuum pump add on. The top bushing is nothing more than a machined hole. It could easily have been made 2.5" long, since that is how much meat there is in the pump body, but for some reason, only the bottom half (1.25")was machined. The top half is machined about .050" bigger, and as far as I can see serves no purpose.

To experiment, I had a 1.25" bushing made, installed it in the top half of an old pump, and line reamed it. I then drilled the oil hole (near the top) straight thru, in order for oil to get to the entire bushing. I may install it someday just to see if it works.
I understand that is basically what Max Merritt does with his version of modification.

Joe H