The motors use a sintered bronze bushing mounted in oil soaked felt.
when they dry out, they get noisy. If the inside diameter isn't worn excessively, re-oiling the felts will make everything copacetic, but it does require taking the motor apart. Replacement motors have a reputation for brush noise. Here is link to a good trouble-shooting article: <http://www.rverscorner.com/articles/furnace1.html> Troubleshooting the RV Furnace

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"Not all who are lost are wondering" say Bill & Heidi
'78 Excella 500,"The Silver Pullit". vacuum over hydraulic disc brakes, center bath, rear twin. '67 Travelall 1200 B 4X4 WBCCI 3737
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