Rebuilding my turbo and I thought I would look at the wastegate since it was on the bench.
Took the spring and cover off and the rubber diaphram was covered in grease.
Is thus normal?
Should I clean and apply fresh grease?
How do I test its function?
Thanks
PS There was no oil contamination in there.

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1983 300D-T sedan

Most of the thick grease was already cleaned out.
Enjoy.
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1983 300D-T sedan

The thick grease is actually condensed oil vapor exposed to many heat cycles. The easiest way to test the wastegate is to install it and measure/adjust boost pressure.

Excellent!

So I should clean it out and make it look all pretty.

I wish there was a way to see if my diaphram is intact before I put it all back in? I guess I could blow into the tube (no wise cracks!) and see if it leaks?

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1983 300D-T sedan