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How does one know if engine bearings are bad?

Old 08-03-2014, 06:14 AM
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sealth_3
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Default How does one know if engine bearings are bad?

I have a Zenoah G45cc engine I haven't used for a few years. I had problems starting it so I put a new carburetor kit in it, and tried to hand start it to no avail. With the new kit installed, fuel began leaking from the two tiny holes(fuel pump)on the back of the cab. I was not successful stopping the leak, and the engine wouldn't start, so I purchased a new carburetor. After installing the new cab, I still was unable to hand start it so I used a drill with enough RPM's to turn the propeller and the engine started(after several tries)I let it run for awhile and noticed black oil coming from the exhaust. I shut it down and was unable to start it again. Could this mean that the bearings are bad?
Old 08-07-2014, 06:27 AM
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apereira
 
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Most likely. In some cases it might sound like something is loose, high vibration, runs hot, lack of power, but the black oil is a good indication of bad bearings.

Regards
Old 08-07-2014, 01:42 PM
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sealth_3
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Thanks for the reply, I was afraid that could be the problem.
Old 03-01-2020, 03:18 AM
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jak_kkaall
 
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Can you please advice me if I should change the ball bearings on a propdrive 42-58 500kv 60w engine after it hit the ground. The engine still works fine, shaft
straight, lots of power, everything ok but when I hand spin the prop some slight noises are heard. You can barely hear it.. I think it's the front bearing, what could had happened inside it? should I change it? The rear one I
couldn't find on my local store or hk. What could happen if I don't change it? How can a bearing go wrong? What happens to them? And what can happen if I oil them and let them there?
Thank you!

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