In doing some routine maintenance on our recently acquired 300TD-T I came across what has been called the "switch over valve" attached to the fire wall, next to brake booster. Both the vacuum line from the turbo and the alda have been disconnected and a short piece of hose connects the two.... a bypass. I understand that this can damage the engine. Is there any test to see if this valve still works before I reassemble the correct way?
Thanks is advance.
Steve