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Buzzing Bosch motor after ride in the rain

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Buzzing Bosch motor after ride in the rain

Old 11-23-23, 01:17 PM
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Buzzing Bosch motor after ride in the rain

Hi folks. Today I rode my Bosch gen4 ebike in strong rain, and a few hours later after it dried up I went to ride again, but when I turn the engine on it does a continuous buzzing sound. I made a short video of it : https://streamable.com/y8wdp6

Any idea what is wrong? Can it fix itself or do I need a warranty case?

Last edited by Fandomii; 11-23-23 at 01:22 PM.
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Old 11-23-23, 01:27 PM
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I'd double check the battery connections first. and then cycle thru the modes.

maybe (I'm sure I will get flamed for this) try spraying some WD40 in around the spindle and the battery connector ?

I use some silicone grease on those connections

Gut feel you got some trapped moisture in there somewhere - not fatal

/markp
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Old 11-23-23, 01:29 PM
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More information would help. Is the buzz loud? Does it sound electrical, or could it perhaps be a part that is vibrating/resonating? Are you hesitant to ride it? Does everything else work as before, or are there other symptoms? For all I know the buzz might be an intentional alert designed into the bike.
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Old 11-23-23, 01:41 PM
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Originally Posted by ScottCommutes
More information would help. Is the buzz loud? Does it sound electrical, or could it perhaps be a part that is vibrating/resonating? Are you hesitant to ride it? Does everything else work as before, or are there other symptoms? For all I know the buzz might be an intentional alert designed into the bike.

Thank you! I put a video of it at the original post. It sounds electrical. I haven't tried to ride it, as I don't want to cause more damage.
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Old 11-23-23, 01:45 PM
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Originally Posted by mpetry912
I'd double check the battery connections first. and then cycle thru the modes.

maybe (I'm sure I will get flamed for this) try spraying some WD40 in around the spindle and the battery connector ?

I use some silicone grease on those connections

Gut feel you got some trapped moisture in there somewhere - not fatal

/markp
Thank you! Is it a good idea with WD40? When you say the spindle you mean where the pedal setup meets the engine?
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Old 11-23-23, 01:53 PM
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It might be arcing someplace where water got in. Put it in a warm place for a LONG time to dry thoroughly.

You might try WD-40 or something.similar if you have a sense of where to spray it. However, these products are usually flammable, so allow time before powering up.
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Old 11-23-23, 01:57 PM
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Another obvious move would be to let it dry more than a few hours. Bring it inside a low humidity place. Take any covers off and aim warm moving air at it for a day or two. Perhaps the problem will go away.
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Old 11-23-23, 02:27 PM
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In the times I have ridden my Bosch bike in heavy rains I haven't had the issue but I did let it dry overnight or for a a day or so. That noise is not good I would take it back to your local Bosch dealer and have them take a look but I would let the bike dry first and see if that makes a difference. I haven't heard that noise on any Bosch bike we have sold or worked on so it is a an odd one.
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Old 11-23-23, 03:06 PM
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And from what I have seen Bosch has a very good warranty service, sometimes extending it beyond the original timeline. Don't get too ambitious taking anything apart yet without consulting a shop first as Bosch may cover it.
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Old 11-23-23, 05:54 PM
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"... In 1961 the first full truckload order for WD-40 Multi-Use Product was filled when employees came in on a Saturday to produce additional concentrate to meet the disaster needs of the victims of Hurricane Carla along the U.S. Gulf coast. WD-40 Multi-Use Product was used to recondition flood and rain damaged vehicles and equipment...."
https://www.wd40.com/history/
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Old 11-25-23, 11:27 AM
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So it got fixed - very weirdly. The noise continued after three days of waiting to see if it will go away. Then I cleaned the bottom part of the motor with my finger, as it had grime from dead leaves, and the noise suddenly went away. I think the noise was coming from the bottom grill (see picture).



Any idea why the bottom part of the engine was making this vibrating noise and stopped when I cleaned it? What is that bottom part for?
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