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Hi, your problem is the bearings and electrical windings in this old motor are going out. This is caused by dust, dirt, and the age of this motor. The motor will start to over amp causing it to heat up and slow down and speed up again. The noise you are hearing is the wear on your motor bearings. It will stop completely soon, and not work at all. If you can, you may think about an upgrade as this is a very old unit. Or, you can have the motor and run capacitor replaced. About an hour labor, you would need to call around to several places for a estimate. Try and find a good company with a good reputation to do this. But yes, this is the problem. Good Luck, Shastalaker7 A/C & Heating Contractor
Phone book, refrigeration distributors, call and give unit make model # serial # 1ph 1050rpm 1/8hp and frame type of motor. Usually a belly band. Though any good parts house can get all needed info off of make model serial. You might need to call a few since many will not sell to you if you are not licensed.
If you unplug it and look at how front glass is held in, and remove it, to access imitation logs etc and they should be removable. Under them you will see a small rod from side to side with foil ribbon like pieces attached to it. On one end there will be a small motor that turns that shaft/rod and it reflects the light to make it look like fire. Not uncommon for those motors to quit and need replacing. Write down make , model and serial number off back (usually) of your heater, and check owners manual for number to call for replacement parts. You may even find an appliance store in your area that has same motor. I would have motor tested before I replace it just to be sure. Also make sure that nothing on that shaft was wedged against something that would prevent it from turning .If you have difficulty with any of this, get back to me with that make and model number etc., and I'll follow up on it for you. Good Luck ! They're usually not that bad to work on.
Unfortunately you are describing bearings going bad in your motor. You can try oiling or greasing them as this is only a short term fix. The ultimate repair is going to be replacing the motor on the blower. When purchasing the next one see if they have the same style and mounting of motor with grease or oiling ports on it. These so called permanently lubercated bearings do not last as long as they say they will.You could try replacing the bearings in the motor instead of replacing it as well, how ever it is just easier to replace the motor. Good luck and sorry to be the bearer of bad news here.
This is probably a dry bearing in the vent motor. Those motors run at high RPM's and can make a deafening high pitched squeal if they become dry and need oiling.
Some of the motors have oil cups on them for dripping oil into and others;s are much more difficult as you need to guess where the bearing is and try to drip oil down into them or run the oil to them.
Any light weight small motor oil ike a sewr machine oil will work.
Many hardwares have small oil bottles with extending spouts made just for oiling motors for just a couple of bucks...
The other thing that can cause this is if the blower wheel is coming loose and has moved to the side and is hitting the side of the blower housing. Take the bottom cover off and check for play or movement side to side in the blower wheel. Spinning it with the power off by hand may give you a clue as you will hear it scraping the side of the housing.
before the heater starts up, the combustion blower starts to purge the chamber of unburnt gases, then the solenoid pump, pumps fuel onto the burner mat, shortly thereafter the ignitor turns on and ignites the kerosene. what you are hearing is the combustion blower. its a small motor with a rather large vacuum impeller on it. it sounds like a jet engine when it first starts. there are two bearings on this motor shaft. yours evidently are dry - no lubrication. replace the motor or if you have the equipment purchase two sealed ball bearings and press them on the shaft.