Furnace Maintenance

By: Fix-It Club

How To Lubricate a Furnace Motor

To keep the motor running cool, make sure it's clean. Most motors are permanently lubricated and sealed by the manufacturer and, therefore, require no further attention. Some motors, however, have covered oil ports above the bearings near the motor shaft.

If the motor has oil ports, it should be lubricated annually. Apply two or three drops of 10-weight nondetergent motor oil (not all-purpose oil) to each port. Do not overlubricate. If the blower shaft has oil ports, it, too, should be lubricated annually, following the same procedure.


You'll probably have to remove an access plate to get at the ports. If the blower has grease cups instead of oil ports, remove the screw caps that cover the cups and fill the cups with bearing lubricant, which is available at automotive and hardware stores.

When you lube the motor, you should also check the belts. Find out how to replace worn belts on the next page.

For more articles on home repair, check out the following links.

  • How To Repair Gas Furnaces and Gas Heaters: Gas furnaces have become popular because they burn fuel cheaply and with few problems. Keep your gas furnace running trouble-free.
  • Major Appliance Repair: If the furnace isn't the only thing in your house on the fritz, you can learn how to fix other machines in this article.
  • Small Appliance Repair: Once you've tackled the furnace, a toaster or blender seems like child's play. Find out how to fix them here.
  • Thermostat Maintenance: To make sure there's actually a problem with your heating system, you may want to check the thermostat, too. Learn how to calibrate a thermostat.