Removing Silicon Grease From V-Belt Pulleys

I messed up and used 3M silicon grease on my alternator/water pump v belt. The belt is getting tossed, but I'm going to end up with a healthy coating of grease on my pulleys. It was such a dumb idea. I saw comments recommending wd40, didn't have any, and thought silicone grease would be in the same ballpark. Huge mistake.

Here's the directions that I'm considering:

Excess grease removal:

  1. Paper towel jammed into grooves and rotate pulley (very time consuming and very difficult to get all the way into grooves)

  2. chalk powder sprinkled onto belt, then run engine to distribute (chalk absorbs regular grease pretty well, not too sure about silicone grease)

  3. Pouring soapy hot water onto the belt as it's running? Or maybe drizzling liquid dish soap and then follow that with a hot water rinse? (everything I've read on silicone says that soap doesn't break it down)

  4. Remove belt, sprinkle chalk on pulley and scrub with toothbrush. (pulley access is a little iffy)

  5. Remove belt, hot soapy water and brush (iffy access, really not sure about soap)

  6. No excess grease removal, just straight to solvents

After the bulk of the grease is remove, then solvent removal

  1. Chlorinated brake cleaner (Perchloroethylene).

  2. Non chlorinated brake cleaner (in this instance: Shop Pro Brake Parts Cleaner 45% VOC (acetone, heptane, n-heptane))

  3. Ronsonol lighter fluid (Distillates, petroleum, light distillate hydrotreating process, low-boiling 65-100%, Naptha 15-60%)

  4. Using more than one of these- separately, allow them to dry between treatments

The solvents all make me a little nervous. This is not like taking a rotor placing it on some newspaper on my lawn and spraying it generously without a care in the world. These are pulleys that are close to bearings that I do NOT want to degrease, and, they might be above other car parts- most like plastic shields that can be removed, but, overall, it's very tight quarters.

Other ideas

  1. Belt dressing. The dressing I bought (super tech) has isohexane and polybutane. Belt dressing is effectively glue, and glue might, to extent, mix with and possibly remove grease, and the isohexane in this might break down silicone. If it doesn't work, I'm thinking the belt dressing should be relatively easy to remove with one of my other solvents.

  2. Chalk is highly absorbent, but perhaps there's a powder out there with a greater affinity for silicone oil?

  3. A belt seems to be pretty effective at soaking up silicone. If I clean the pulleys and don't do a perfect job, I can drive for a bit with the new belt, and then replace that with another.

One other complication. The work I do will most likely be in the rain- not pouring, but a drizzle. The alternator and water pump pulleys are accessible from above, but the harmonic balancer pulley can only be accessed from the wheel well or underneath, and I'd prefer not to spend to much time on wet ground. I'm hoping I can guide a jet nozzle tube to the top of the harmonic balancer pulley to apply the solvent, but I'm not sure I can.

Posted May 5, 2025, 2:06 AM UTC

11
Loading comments…