[dffej511]

I am currently looking to potentially purchase a 2007 Roush 427R with 19,000 miles on it and I have one big question. I have had several Roush mustangs in the past and have never experienced rusting on the pulley assembly at the front of the supercharger as shown in the attached picture. Has anyone ever seen this type of erosion or know what may have caused it. Car is spotless otherwise.

 

[dffej511]

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I’m going to take a really wild guess at this, so please treat it as such …

The front seal of the compressor failed or the compressor was rebuilt. Either of these require the removal of the front pulley/nut. The pulley was messy, so the person who serviced it cleaned it with an excessively strong acidic solvent, removing paint and oils. This allowed rust to easily form even with light moisture.

That’s my guess, take it for what it is …

Sounds like a good guess. Do you know if these can be replaced? I know from previous Roush ownership that some replacement parts are hard to come by.