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Oil leak???

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There should be vacuum on the port on the PCV valve. When I hooked the vacuum gauge to that port the vacuum was zero for a second or two and then it went to about 10 in-hg.

I was thinking that maybe the valve cover, when sealed, would allow the vacuum from the PCV valve to remove the pressure from the crankcase. It seems to me that there should be some restriction to allow the vacuum to increase.

I apologize if I am not being clear. I guess I just don't artikulte vury good.

Thanks, Pete
 
To put this vacuum thing in perspective, from 1970 thru 1976 the valve cover was evacuated by a low vacuum thru a nipple on the carbs. The Vacuum is very low when the engine is idling barely 2 in-HG. In fact the only time there is a significant vacuum is when there is deceleration or engine braking.
The point is, it doesn't require a great vacuum to relieve crankcase pressure.
The TR6 oil filler cap is not vented, so all the crankcase pressure is relieved thru that mild vacuum.
Ok, so you don't have the carbs with the evacuation nipples, but, if the evacuation hose on the valve cover can be connected to a mild vacuum such as you have on the air filter housing, you should be able to accomplish the same thing.
See what happens if you bypass the PCV valve and go straight to the air filter housing.
 
poolboy said:
See what happens if you bypass the PCV valve and go straight to the air filter housing.
Click to expand...

Poolboy,
Could this connection be anywhere on the a/f housing or does it need to get into the airflow to the carb opening?
Cheers
 
Jones,if you are more or less starting from scratch on a deal like this, I think I'd go inside the perimeter of the filter, "into the airflow" as you say. .
If you have an aftermarket air filter housing, you may see a "knock out" plug for just such an attachment.
 
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