oil shooting out of breather hole... need help

[akinney07]

I am running a freshly rebuilt chevy 350. It had a complete rebuild including the heads. When I first put the motor in, i was told the valves were already adjusted and should be able to set the timing and fire it up. I later found out there was no compression in any of the cylinders due to over tightening the valves. I re-adjusted the valves and the motor runs great except for one thing. I have a rubber oil fill plug on the drivers side valve cover and that keeps blowing off and shooting oil out. I have a plug on the passenger side and you can easily see that pressure is building up inside the valve cover. What should I check? I have no clatter fromt he rockers. Could the seals have been blown by overtightening the valves?

 

[dyeager535]

Where is your vent? You HAVE to have a vent on the valve covers, typically vent on one side, PCV on the other.

 

[mxfireman]

X's 2 put a vent on one side and you won't have any more problems.

 

[xanthias]

Where is your vent? You HAVE to have a vent on the valve covers, typically vent on one side, PCV on the other.

x3. That's your problem.

 

[akinney07]

does the other side of the PCV valve hook to the bottom plate of the air cleaner or the carb?

 

[akinney07]

i did put just a PCV valve on one side with no line hooked up and oil still shot out all over my hood and the top of the intake. is that normal?

 

[rockink5]

you'll have to hook the PVC up to vacuum or it won't work right. It works off vacuum not crankcase pressure. Normally hook it up to a large vacuum port on the base of the carb.


Make sure that the other valve cover has a breather in it or hook up to the air cleaner so you can get ventilation through the motor.

 

[akinney07]

I have a pretty large cam in there that requires me to run a vaccum canister for my power brake booster. Do you think there will be enough vaccum from the large vaccum port of the carb to open the PCV valve?

 

[rockink5]

I have a pretty large cam in there that requires me to run a vaccum canister for my power brake booster. Do you think there will be enough vaccum from the large vaccum port of the carb to open the PCV valve?

There should be plenty for that. It doesn't take much.