pwlovely Posted July 11, 2020 Share Posted July 11, 2020 Where can I find a schematic of the vacuum system and the operating specifications? Thanks in advance Link to comment Share on other sites More sharing options...
19tom40 Posted July 11, 2020 Share Posted July 11, 2020 From memory, the only things that the vacuum system operates on a stock 47 LC is the windshield wipers and the vacuum brake. So there is no need for a schematic. The wipers come off a port behind the carb and the vacuum brake is fed from a port in front of the carb. The only specification that I can remember is that idle vacuum is supposed to be 18-20 inches adjusted for elevation above sea level. I hope that this answers your question. Link to comment Share on other sites More sharing options...
pwlovely Posted July 11, 2020 Author Share Posted July 11, 2020 More than I knew before. My windows also work off the vacuum. I believe the tank behind the left wheel is part of the vacuum system. The service manual I acquired does not discuss the vacuum system. Thank you Link to comment Share on other sites More sharing options...
abelincoln Posted July 15, 2020 Share Posted July 15, 2020 My understanding is windows should be hydraulic, run by pump in drivers side engine compartment. Also works top on cabriolet models. Vacuum hose runs from engine to tank under right front fender. smaller hose goes to wipers and radio antenna. Sometimes the one way vacuum hold valve at the tank goes bad. Abe Link to comment Share on other sites More sharing options...
pwlovely Posted July 17, 2020 Author Share Posted July 17, 2020 You are correct, the windows are hydraulic. Link to comment Share on other sites More sharing options...
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