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  1. #1
    Junior Member
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    Sep 2009
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    1972 Sturmey Archer Dynohub overhaul

    Hello everybody, I've enjoyed reading the forums for a while, but this is my first posting.

    I'm currently in the middle of overhauling a 1972 SA Dynohub that came my way, and I have a question for anyone with experience working on these hubs. I've done plenty of overhauls on other types of hubs, but this is my first time working with a generator hub.

    The issue I'd like advice on is the presence of rust inside the hub shell. It mostly seems to be surface rust, as a rag and penetrating oil takes it right off, revealing shiny chrome underneath. Where the rust concerns me more is in the gap between the armature and the magnet. I realize that there should be some magnetic resistance when rotating the armature inside the magnet, but it feels like the rust may be adding some gritty resistance. Since I do not have a keeper ring (and I assume that they're about as rare as unicorns), I'd like to avoid separating the armature and magnet to clean off the rust. Would the armature be harmed in any way by dropping a modest amount of penetrating oil into the gap to dissolve the rust?

  2. #2
    Elitist Troglodyte DMF's Avatar
    Join Date
    Jun 2006
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    Dallas
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    03 Raleigh Professional (steel)
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    So long as you don't get it into the bearings, it's worth a try, I suppose.

    The keeper ring may not be proprietary, btw. Got a pic?
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

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