Quote:

---

Oil is blowing out the breather located in the left valve cover. Its enough to puddle on the floor after I drive the car for about 5 or more miles. What is causing this and how do I fix it?

---

Crankcase pressure is the only reason that oil will be blown out of the breather caps Two possible causes, possibly a combination of both. First one is a plugged PCV valve , the other is bad ring seal. Remove the breather cap and PCV and start the motor up, let it get warmed up and then revved the motor up from idle to around 4000 RPM several times rapidly, if the smoke from the valve covers increases each time you rev it up it is blowby Let us know what you find, also has this motor set for a long time before you started driving it? A very simple way to check the PCV valve is to put your finger over the hole in the bottom with the motor running, if the idle speed decreases it is working, your plugging a metered vacume leak If it doesn't change the idle speed it, the PCV valve or hose, is plugged up Let us know what you find

Quote:

---

Do you have a pcv valve on the car?

Are the baffles in the valve covers?

---

Quote:

---

No PCV valve

---

Quote:

---

Quote:

---

No PCV valve

---

What do you have for crankcase ventilation? If none at all, just normal blowby will cause your symtoms

---

Quote:

---

You must have PCV system hooked up otherwise you run the risk of blowing out gaskets and it will always leak oil.

---

You don't have to have a PCV but it is a good idea for many reasons.

If you don't have a PCV you DO HAVE to HAVE adequate crankcase ventilation though IE: non restrictive breather(s)

All engines develop a certain amount of Blow by. The PCV and or breathers relieve this pressure that would otherwise continue to build up inside the crankcase and eventually begin blowing gaskets seals etc.
If an engine is developing excessive amounts of blowby it is normally due to poor ring seal or a head gasket. A leak down test will establish which of the two is the culprit.
based on your description either your existing breather is very restricted or you have excessive crankcase pressure.

Quote:

---

You can buy a rubber grommet that will fit into the valve covers for the PCV valve that will allow you to run another pushin breather cap like your running now, I do that on my race motor running E85 I use two twistin and two pushin breather caps, not the twistin non breather cap like your using now I have a set of those valve covers your using on another street motor I have, I'm using a PCV valve on it If you want I can verify which rubber grommet I used to make the stock Mopar PCV valve fit into those valve covers. I probally have one of those in stock

---

Quote:

---

I would still encourage a leak down test just to verify the ring seal is good. blowing oil out of a breather cap, especially with baffle in place is usually not a good sign. Leak down testers are relatively inexpensive.
I also would encourage the use of a PCV on a street engine.
Good luck and keep us posted

---

Not all machine shops use a torque plate when finishing the final bore preperation, it shouldn't blow the oil out of your motor now as long as you have two breather caps on it, do you?

Quote:

---

Quote:

---

You must have PCV system hooked up otherwise you run the risk of blowing out gaskets and it will always leak oil.

---

You don't have to have a PCV but it is a good idea for many reasons.

If you don't have a PCV you DO HAVE to HAVE adequate crankcase ventilation though IE: non restrictive breather(s)

All engines develop a certain amount of Blow by. The PCV and or breathers relieve this pressure that would otherwise continue to build up inside the crankcase and eventually begin blowing gaskets seals etc.
If an engine is developing excessive amounts of blowby it is normally due to poor ring seal or a head gasket. A leak down test will establish which of the two is the culprit.
based on your description either your existing breather is very restricted or you have excessive crankcase pressure.

---

Quote:

---

Quote:

---

I would still encourage a leak down test just to verify the ring seal is good. blowing oil out of a breather cap, especially with baffle in place is usually not a good sign. Leak down testers are relatively inexpensive.
I also would encourage the use of a PCV on a street engine.
Good luck and keep us posted

---

Not all machine shops use a torque plate when finishing the final bore preperation, it shouldn't blow the oil out of your motor now as long as you have two breather caps on it, do you?

---

Quote:

---

OT but for reference it is a good read on ring seal. "breakin secrets" at www.mototuneusa.com

---

Quote:

---

Quote:

---

OT but for reference it is a good read on ring seal. "breakin secrets" at www.mototuneusa.com

---

I have never read the entire link, it's a good one. But I think your saying? or they are saying a PCV will help the rings seat better just like a vacuum pump on a much smaller scale?

Either way that's my opinion for a street car, that a PCV valve will help the rings.

---

Quote:

---

Can you post a picture of the passenger side valve cover?

---

Quote:

---

This topic has been beat to death over the years on here. PCV valves are very helpful on street engines to help ventilate the crankcase. PCV valves flow max amounts at low vacuum(wot) conditions. They flow less at closed throttle(high vacuum) conditions....check it out!

https://www.google.com/search?q=pcv+valv...mp;ved=0CCQQsAQ

---

Me thinks you have the flow backwards, maximum at idle to part throttle, no or almost no flow at WOT that is according to all the vacume gauges I've used over the years

Quote:

---

Quote:

---

Can you post a picture of the passenger side valve cover?

---

---

Quote:

---

Quote:

---

This topic has been beat to death over the years on here. PCV valves are very helpful on street engines to help ventilate the crankcase. PCV valves flow max amounts at low vacuum(wot) conditions. They flow less at closed throttle(high vacuum) conditions....check it out!

https://www.google.com/search?q=pcv+valv...mp;ved=0CCQQsAQ

---

Me thinks you have the flow backwards, maximum at idle to part throttle, no or almost no flow at WOT that is according to all the vacume gauges I've used over the years

---

Take a look at the link I posted. I understand vacuum drops under load....however the flow through the valve increases because of spring tension. They do that because,as you know, the engine produces more blow-by under load. I have posted pics of the flow through the valve on numerous occasions, I just don't have them on this pc. The link has many of the same pics.

Quote:

---

Quote:

---

Oil is blowing out the breather located in the left valve cover. Its enough to puddle on the floor after I drive the car for about 5 or more miles. What is causing this and how do I fix it?

---

Crankcase pressure is the only reason that oil will be blown out of the breather caps Two possible causes, possibly a combination of both. First one is a plugged PCV valve , the other is bad ring seal. Remove the breather cap and PCV and start the motor up, let it get warmed up and then revved the motor up from idle to around 4000 RPM several times rapidly, if the smoke from the valve covers increases each time you rev it up it is blowby Let us know what you find, also has this motor set for a long time before you started driving it? A very simple way to check the PCV valve is to put your finger over the hole in the bottom with the motor running, if the idle speed decreases it is working, your plugging a metered vacume leak If it doesn't change the idle speed it, the PCV valve or hose, is plugged up Let us know what you find

---

bad rings or burned pistion... ask me how I know. Like mentioned you need a leak down. sorry

Quote:

---

Quote:

---

Quote:

---

This topic has been beat to death over the years on here. PCV valves are very helpful on street engines to help ventilate the crankcase. PCV valves flow max amounts at low vacuum(wot) conditions. They flow less at closed throttle(high vacuum) conditions....check it out!

https://www.google.com/search?q=pcv+valv...mp;ved=0CCQQsAQ

---

Me thinks you have the flow backwards, maximum at idle to part throttle, no or almost no flow at WOT that is according to all the vacume gauges I've used over the years

---

Take a look at the link I posted. I understand vacuum drops under load....however the flow through the valve increases because of spring tension. They do that because,as you know, the engine produces more blow-by under load. I have posted pics of the flow through the valve on numerous occasions, I just don't have them on this pc. The link has many of the same pics.

---

Quote:

---

You can get a twist in pcv valve that looks like a breather, autoparts stores sell them or get a different grommet for the blockoff grommet you have on the pass side valve cover.

---