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Daddybus
Samba Member
Joined: June 15, 2000
Posts: 1653
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 Posted: Tue Nov 12, 2013 10:06 pm Post subject: Droning sound in drivetrain |
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My bus, 1967, with 78.8x90.5 motor. At about 2K rpm I get a droning noise. (2k-3k rpm). Sounds like a rear wheel bearing, but those are now new. I replaced the fan, fan tin was bent a bit so I body worked the dents back into shape. It makes the noise whether in gear or reving it in neutral. When I rev the motor from the engine compartment I can feel a vibration. I will try reving it without the fan belt to see if it is the alternator.
Any ideas? |
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Daddybus
Samba Member
Joined: June 15, 2000
Posts: 1653
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| Posted: Tue Nov 12, 2013 10:31 pm Post subject: |
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OK.
Without fan belt, no vibration.
With fan belt, vibration.
I think the fan is rubbing the backing plate/tin. I can hear it slightly at idle.
I checked the rear alternator bearing by trying to move the fan up/down. no play. |
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bugguy076
Samba Member
Joined: December 11, 2007
Posts: 1068
Location: Dover, PA.
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| Posted: Wed Nov 13, 2013 3:36 am Post subject: |
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You will have to remove the fan from the housing to see if it is bent or cracked. Just dirt in the fan can cause an out of balance condition.
I have seen cracked fans on stock engines. |
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