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1947 LC vacuum system

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Where can I find a schematic of the vacuum system and the operating specifications?

 

Thanks in advance

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Benefits of AACA Membership.

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.

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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

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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

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