I have a gas furnace (Day and Night brand) that is about 25 years old. It heats fine but has an extremely noisy blower motor. It is a loud combination of thump, thump,thump with a lot of sheet metal noise. The blower is direct drive (no belt) and I cannot see without doing a complete dismantling where there are any lubrication points. So is the motor worn out or can I go in and attempt to tighten up "loose parts"?

Regards,

Ron lowe

Is the thump noise only when the unit stops running

Prehaps the blower is loose on the motor shaft or the bearing in the motor are worn. Have you checked these yet?