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Old 03-19-2012, 02:08 PM   #1
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Oil furnace not blowing hard


For the last two days the furnace began vibrating and last night it became quite violent with the vibration. This morning it suddenly made a loud clunking noise as if some part fell off in the furnace room. Now it is not blowing at all. I know absolutely nothing about furnaces or what they should look like. What should I be looking for?


Last edited by otackett; 03-19-2012 at 02:20 PM.
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Old 03-19-2012, 02:23 PM   #2
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Oil furnace not blowing hard


Likely a broken blower wheel.
Usually in the bottom of the furnace behind an access panel.
Google furnace blower wheel replacement; they'll be tons of pics/videos.

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Old 03-19-2012, 03:49 PM   #3
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Oil furnace not blowing hard


Okay, thanks. I did find the broken piece. A piece of the metal belt pulley snapped in half. Do I need to replace the entire motor or is that piece detachable? Where do I begin looking for it? Thanks again for all your help.
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Old 03-19-2012, 04:16 PM   #4
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Oil furnace not blowing hard


If that's the pulley that's attached to the motor it's either a solid pulley thats broken or a split pulley thats come apart. Watch out that the edges of that pulley have not worn down to knife edge sharpness.


Turn off the furnace power, turn the stud or allen key on the hub of the pulley that is biting into the motor shaft counterclockwise a few full turns. If the shaft is in OK shape, what's left of the pulley should slide off the end of the shaft. If any parts of the end of the motor shaft are wider than 1/2" then it becomes more difficult to remove. WD 40 , a file for bringing the shaft back into round & a large screwdriver crowbaring between the motor and the pulley are not unheard of removal tools.
Take that pulley into an HVAC supply house for an exact replacement. Even many of the box hardware type stores in my neighbourhood carry a variety of pulleys for what I'm assuming is a 1/2" shaft.

Last edited by how; 03-19-2012 at 04:25 PM.
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Old 03-19-2012, 04:41 PM   #5
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Oil furnace not blowing hard


Perfect! I was able to get it off and I am on my way to get a replacement. Thank you sooo much...and they say women aren't handy.
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