I have an Air King 9155 window fan that I have been using during the summer months for the past five years. The motor has spherical bushings, which are a bronze colour and might be sintered, but not sure about this. The motor also has three operating speeds and is 1/6 HP.
Several weeks ago the fan started making noises and had trouble starting on low speed. Eventually I took it apart, split open the motor and found a bunch of tar-like stuff in the NDE bushing which I believe was burned up oil. The bushing wick material was completely dry also. I cleaned it up and re-oiled with 3-In-One Motor Oil. Now it works fine on low and medium speed. But on high speed I hear a faint high pitched sound, like a metal-on-metal sound, and eventually after about 10 minutes of running it makes a loud squealing sound which I assume is coming from the NDE bushing.
I’m wondering how to fix this problem. I'm thinking perhaps the 3-In-One oil is too light and I should have used something heavier. What do you think? What is the proper oil for bushings on a small fan motor?
Several weeks ago the fan started making noises and had trouble starting on low speed. Eventually I took it apart, split open the motor and found a bunch of tar-like stuff in the NDE bushing which I believe was burned up oil. The bushing wick material was completely dry also. I cleaned it up and re-oiled with 3-In-One Motor Oil. Now it works fine on low and medium speed. But on high speed I hear a faint high pitched sound, like a metal-on-metal sound, and eventually after about 10 minutes of running it makes a loud squealing sound which I assume is coming from the NDE bushing.
I’m wondering how to fix this problem. I'm thinking perhaps the 3-In-One oil is too light and I should have used something heavier. What do you think? What is the proper oil for bushings on a small fan motor?