Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

Thread: Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

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  1. #1
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    Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

    Hey All,

    Got my first vintage piece yesterday - a 31mm SS Benrus Shock Absorber manual BH11 movement. Anyone know if these are ca. 40s or 50s?

    I bought it for under $20, as it was listed as not working, but I liked the dial condition and the solid SS case with drill through lugs.

    It shocked me how small it was. When I tried to wind (clockwise) it, it turned with resistance, and had a kind of grinding/clunky feel to it. Counter-clockwise winding is smooth clicks.

    I opened it up, and the movement was immaculate - those inner dust-proof casings do a great job. With my trusty magnifier glass I started looking for damage, but couldn't find any. Eventually I noticed the balance had kind of moved for a brief moment, so I started to gently tap it, and within a short while it started up and was ticking away. It ran all night. I didn't want to risk seeing if the winding had changed, so I just let it run, and did a little research.

    From what I found online, it sounds like it might not be an easy fix - I wish I could find the page I was reading last night, something to do with the gears on the castle wheel being damaged possibly?

    Apparently you are never supposed to wind a watch on your wrist as this places pressure on the stem and can lead to uneven wear of the outer teeth of the castle wheel, which are engaged when the stem is pushed in. Didn't know this.

    The pictures below make the crystal much worse than in reality - the dial is much easier to see than in the photographs.

    I am strongly considering taking the timezone online class to learn how to clean and possibly repair watches, but I don't have a lot of tools as yet. I am tempted to buy a cheap BH11 movt. on the Bay, and take it apart before I even touch this watch anymore.

    Here are the pics, I didn't take any of the movt., but I know it is definately a BH11, and looked really clean. I will try to take some tonight.

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    Any suggestions on how to keep my posted pics from going horizontal?

    Advice, knowledge, suggestions welcomed.

    Thank you all!

    Greg

  2. #2
    Member tinknocker's Avatar
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    Re: Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

    Last edited by tinknocker; February 16th, 2017 at 03:16.
    Always give a word or a sign of salute when meeting or passing a friend, even a stranger, when in a lonely place. Show respect to all people and grovel to none.

  3. #3
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    Re: Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

    Also, winding it counter clockwise doesn't wind the main spring, must go clockwise
    Always give a word or a sign of salute when meeting or passing a friend, even a stranger, when in a lonely place. Show respect to all people and grovel to none.

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    Re: Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

    LOL, I knew it was a stretch, I was just hoping for good news like - "oh yeah, you can wind those watches either way!!"

    I just got home and the watch is still running. I will open it back up and take some pictures of the movement, and also check the link that you posted.

    Thanks!!

  6. #5
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    Re: Benrus Shock Absorber, BH11 movt., runs, but grinds when wound

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