A/C blower motor question..

groundhogy wrote:
That helps alot John.
So that seems like two votes for the AO Smith. I will try to find one of their motors.

The other issue is how fresh is the motor off the assy line? Those sleeve bearings are just soaked in oil so won't they dry out over time?

Also... you guys just reminded me.. I bought one of those EZ Start kits and never installed it. I should dig that up.

Yes, I did return to Pennsylvania for the last summer season. The AC ran, but that is when I started to notice what seemed like blower motor noise. I went up on top the other day, and the motor does spin if you use your hand, but it doesn't spin freely. There is significant friction.

Hi ground hog,

The bronze bushings with oil, odds are high that those are oil-impregnated sintered bronze bushings. In the industry, they are nicknamed "Oiltite bushings" as Oilight was one of the original inventors. These guys, I think, were bought out along the way. https://oilite.com/oilite-all-products

There are many brands now that sell oil-impregnated sintered bronze bushings. The heat of friction draws the oil out of the bushing to keep the bushing lubricated. If the bushing brand is good, I have seen AC units last 20-plus years with those bushings.

Now to your drag and noise; by your description, you might have a problem other than the bushings that can create excess drag and noise. Coleman Mach shows they are using a prop fan on the outside and a squirrel cage fan on the inside. I do not know your model, but here is a parts list on a Mach 3 + a common TT AC unit. https://www.airxcel.com/DesktopModules/RvProduct/Pdf/r667.pdf

The inside squirrel cage fan may have shifted and is rubbing on the housing. I have not worked on the Machs, but I have on the Dometics, which are built, in concept, close to the same. What led you to believe it was the motor bushing versus a fan wheel rub?

Again not knowing your AC model number and not being fluent with the Mach's, I'm not sure if you can see up at the squirrel cage fan from inside the camper with the air box removed or if you have to go in from the top down without much work. Maybe one of our other guys who have been into these can tell. On the Dometic, I know you can get in not too hard from the top down, pull the cover and the blower housing cover off, and the fan is exposed to see the inside fan wheel.

Hope this helps

John