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Best way to clean corrosion off exhaust manifold mating surface on engine side?

Motor Vehicle Maintenance & Repair Asked on September 25, 2021

It’s an aluminum block and there are some high spots of white powdery corrosion.

I was able to gently scrape most off using a (dull) metal paint scraper and a green scour pad, but there are some stubborn spots remaining.

Also I vacuumed out any fine particles from the scour pad that landed in the ports, but if I missed any that “may” have gotten deeper inside is that cause for worry?

One Answer

The best or accepted way was to run the manifold face on emery cloth which was on a flat plate or surface plate.

This would gradually reduce the high points.

If the amount needed was significant then a machine shop could machine it.

Answered by Solar Mike on September 25, 2021

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