Dutchman wrote:Another good thing for the blower motors is to give them a "brush-clean" once and again on the squirrel cage and the intake screen and then a light oiling to the motor. My combustion blower runs continuously and it's fine.
As for flame, mine also dances and rolls to the roof when burning hot.
FYI...I called Fasco to check on what their motors were spec'd for as far as temps. They said they this:
135 Deg C thermal protector. The lube is Shell Turbo 68 oil which has a temp rating of -20 F to 200 F.
I've measured external case temps on my combustion fan of over 150 degrees F on a medium burn using a Fluke IR thermometer. Internal and winding temps have to be a lot higher. I'd say you want to use a high quality oil.