How To Re-Wire A Potted Motor, Business Office 14: Replacing The Motor Housing Grommet

I almost forgot! Before nosotros accept the big footstep of soldering the novel motor leads on, there’s 1 to a greater extent than affair nosotros ought to check, equally this is easier to produce piece we’ve got the motor leads clipped too out of the way. Take a expect at the prophylactic grommet roofing the hole that the motor leads volition eventually become through.

Here I tin meet this 1 has a scissure inward it:

And when I describe at it fifty-fifty gently alongside my fingers, it breaks apart into this:

This is relatively uncomplicated to supervene upon too costs close v cents. Your local hardware shop ought to possess got a pick of grommets inward a bunch of niggling drawers. This took me some trial-and-error to figure out, but to salve yous some trouble, hither is the exact type too dimensions you’re looking for: What yous demand is a “Push-in Grommet, 3/8" Inside Diameter, 5/8" Outside Diameter, 3/32" thick, for a 7/16" diameter hole.”

(In the consequence your hardware shop doesn’t acquit them, yous tin guild them from McMaster-Carr at this link; the business office publish is 9600K33, but the employment is they alone sell them inward bags of 100 for close vi bucks. That's a lot of potted motors.)

To supervene upon the grommet, let’s expect at the hole where it’s going to go. If whatever bits of the former grommet are stuck to whatever business office of the hole, yous tin build clean it off alongside a moistened Q-tip.

Don’t forget to depository fiscal establishment check the within of the hole. Here, on a Worst-Case Machine, the fossil oil too grease mistakenly injected into the motor has melted the grommet to the within of the hole, creating a mess. A novel grommet volition non gibe because all of that melted gunk is clogging upwardly the within of the hole. This requires to a greater extent than aggressive cleaning, which is much easier for us to produce earlier nosotros install the novel wiring, which mightiness become far the way.

I build clean this crud out past times using Q-tips moistened alongside rubbing alcohol too a dental pick. (Caution: Be certain to blot the Q-tips well--if whatever alcohol runs out of the hole too onto the exterior complete of the motor, it will eat through the paint.) What I produce is purpose the Q-tip to apply some alcohol to the melted rubber, permit it soak inward for a chip to intermission it up, too then I start scraping out the former prophylactic alongside the dental pick. The alcohol actually helps it come upwardly off inward nice, meaty chunks. After close 10-20 minutes, it looks similar this:

Now it’s create for the novel grommet. To insert it, I purpose a cheapie plastic stick-thingy I bought inward the clay department of an fine art render shop for less than a buck.

But yous tin purpose anything sparse too cylindrical that has a blunt tip, similar if yous possess got a gear upwardly of those long plastic chopsticks; simply brand certain they’re non the sort alongside the pointy ends or you’ll poke through the rubber. (You could in all probability fifty-fifty purpose a spool pin, though I’d roll it inward masking record commencement to avoid accidentally scratching whatever paint.)

The grommet has 2 rims, 1 that volition air current upwardly within the motor hole, too the other of which stays exterior the hole.

Think of the grommet’s inner rim equally a shirt, too the motor hole equally a couple of pants. You demand to tuck the shirt into the pants. Use the chopstick or what possess got yous to become around the grommet, tucking that inner rim into the hole.

Once you’ve got most of it tucked in, shine the within of the grommet out past times pressing alongside your tool, too and then it all simply sort of “pops” into place.