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Random B18 engine anomalies 140-160 1968

posted by  drj434343 on  Sun Jun 28 19:03 CST 2009
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last visit: Thu Oct 24 09:46 CST 2013
[RELATED]

Whoa, your post is making me realize I'm a bit over my head here.

First, the routing. There is a red metal box coming out of the driver's side of the block, forward of the distributor. I take that to be a flame trap of sorts, maybe with some sort of valving (is that the PCV?). Looks original. A 1/2" ID rubber hose comes straight up from that to a T fitting. From there, one side of the T goes to the brake booster, and the other goes to the manifold. That's the extent of the system best I can tell.

Observations: I've unplugged the hose from the brake booster. It pulled a wicked vacuum.

Is the idea that the manifold should pull a vacuum under normal conditions? What is the flow of air past the PCV valve? Is there normally a slight crank case vacuum? The source of my question is trying to figure out where and how that PCV valve functions. Is it in that red box?






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