Water Pump Question - Video Included - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 04-19-2011, 08:19 PM Thread Starter
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Water Pump Question - Video Included

I am chasing a weird noise/vibration at 70mph or higher on my 99 C280. I had all the tires balanced and the car aligned. Didn't help. I then rotated the tires. No change. The sound/vibration does not shake the steering wheel. It feels like it is coming from the front end and only occurs at 70 and higher. You can feel it coming on around 60, but not bad.

This leads me to my Water Pump. Here is a video of the pump at idle. It obviously needs to be replaced. At 11-12 seconds it really jumps.



Could this be making a weird sound/vibration at highway speeds? Why isn't it doing it when cruising around at 40mph? Its more of a noise than a vibration, but you can feel that something is going on when it is occuring.

Last edited by Ipaman; 04-19-2011 at 08:21 PM.
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post #2 of 6 (permalink) Old 04-19-2011, 08:51 PM
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Try looking in your cars specific forum.
W202 C-Class - Benzworld.org - Mercedes-Benz Discussion Forum

I'm not sure if that could be the cause of the vibration, but it deffinatly should be fixed.

Replace it and see if that does the trick.



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post #3 of 6 (permalink) Old 04-19-2011, 09:02 PM Thread Starter
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Yeah I am definitely going to replace it this weekend. My question really isn't car specific though. I'm just wondering how this water pump acts around 70mph or higher. Does it spin faster the faster you drive? Maybe it takes it a certain rpm with a load on it to cause the issue.

Last edited by Ipaman; 04-19-2011 at 09:06 PM.
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post #4 of 6 (permalink) Old 04-20-2011, 04:38 AM
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The pulley/tensors you see on the video, and the rest on the same belt, are driven by the crankshaft. As such they are subject to the rpm's developed by the engine, which is independent of the vehicle speed because, obviously, it depends upon the shift engaged.

Regarding the video and your question, I'd pay close attention to the axis of the pump which is wavering in and out visibly, as it is for the belt. You seem to have something grinding and wearing out in there.

A car would show appreciation for preventive maintenance by never leaving his owner stranded.

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post #5 of 6 (permalink) Old 04-20-2011, 07:13 PM Thread Starter
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Thanks guys. I'll replace that pump this weekend and report back.
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post #6 of 6 (permalink) Old 04-22-2011, 03:36 AM Thread Starter
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I got the pump pulled last night and man was it in bad shape. It felt like dirt was stuck in the bearing when I tried to turn it. I should be completed by tonight so hopefully this cures my highway noise.
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