I haven't changed out my impeller in a long time (probably 10 years), so I figured I do a rebuild to my Johnson pump F5B-9 (Volvo AQ260 - Chevy 350 engine). I've got the rebuild kit which includes a new impeller, seal, cover plate gasket, brass washer and 2 spare cover plate screws. I've found that after removing the cover plate, impeller, seal & brass washer (in that order), I found a small disintegrated rubber washer around the main shaft at the very bottom of the 'stack'. It measures about 20.5mm outside diameter. I found a Johnson instruction manual (rebuild kit didn't have any) on line for a F6B-9 and it says there is an O ring if you remove the bearings (they show the size as: . I'm not planning on removing the bearings. Seems nothing is frozen - rotates fine. There also appears to be 4 'steps' that hold the brass washer away from sitting flush with the bottom. This washer (or O-ring - whatever it is) would occupy that space.
So my question: is this washer/O-ring vital (my water pump was working ok with no leaks). and if so, why wouldn't the rebuild kit have one? If I should be concerned about putting something there, what is the size and/or part number?
I'm also curious if I should put any lubricant down where the bearing live. Thanks much!
So my question: is this washer/O-ring vital (my water pump was working ok with no leaks). and if so, why wouldn't the rebuild kit have one? If I should be concerned about putting something there, what is the size and/or part number?
I'm also curious if I should put any lubricant down where the bearing live. Thanks much!
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