Quote:
Originally Posted by Doug Huffman
On an ALH TDI it is called, more descriptively, the anti-shudder valve. It's operation is checked as the only installed defence against a runaway engine fuelled by lube oil through failed turbo seals.
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Plus on ALH engine it helps to stop the engine smoothly and quickly (same use on our M57)by blocking the air but its operated by vacuum on ALH TDI.