Air Injection Pump
John Himes had an air pump seize up on him, so he dissected the damaged unit and provided some pictures. "Pump with rear removed. Notice that the shaft is not centered."
"The back plate straight on."
"Close-up of shaft. Notice gouge track."
"Shot of inside showing 1 of 2 blades retracted on the output side."
"Shot of inside showing the other blade on the input side."
"Top view with back removed. Air comes in from the top left side, it is then swept around & out the top right side & then into the exhaust."
"Left to right, pulley, plastic vented air disc, air pump. The air goes in through the opening in the top of the pump in this picture."
"Looking inside you can see what the scraping blades attach to. The top one is shaped like a U & the other one fits inside this U."
There followed a brief discussion on whether such a pump could be disassembled and reassembled leaving out a few choice parts, so that it ends up looking like an air pump but functioning as an idler pulley. Himes reported that it may be possible, but not with this unit because the bearing that failed and chewed up the innards was one of the bearings that needs to stay! What needs to come out is the two blades; then the rotating drum can be reinstalled to spin without doing anything. Himes provided a few more photos:
"Showing the 2 blades broke apart (only way I could get them out). The 4 smaller metal pieces attach to the blades & ride on the shaft."
"The cylinder in the pump is hollow with the 2 blade assemblies removed."
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