Does anyone really know what the function of the copper crush washer is? It appears to me that it doesn't really get crushed, so calling it a crush washer may be incorrect. It seems more to act as a "bearing" surface between the spring and the DV plunger part. I've always questioned the necessity of replacing the washer since, as I said, it never gets crushed and don't think it will even wear out. I don't even see it pictured in that drawing in post #1 of this thread. I wonder what would happen if it was left out completely?

I always assumed it allowed the plunger piece to rotate if it wanted to since having it be between the bottom of the spring and the top of the plunger allows the plunger to slide against the washer instead of the bottom of the spring - where it could get snagged on the end of the spring wire or the spring itself could wear into the top of the plunger piece if they were in constant contact with one another. I'd love to know if someone actually knows the exact purpose of that copper washer in there.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz