Re: Oil blowing out of breather
[Re: frank]
#1704015
11/27/14 07:25 PM
11/27/14 07:25 PM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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Do you have a pcv valve on the car?
Are the baffles in the valve covers?
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: Oil blowing out of breather
[Re: frank]
#1704016
11/27/14 07:40 PM
11/27/14 07:40 PM
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Joined: Aug 2003
Posts: 43,252 Bend,OR USA
Cab_Burge
I Win
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I Win
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Posts: 43,252
Bend,OR USA
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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
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Oil blowing out of breather
[Re: moparpollack]
#1704017
11/27/14 07:54 PM
11/27/14 07:54 PM
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Joined: Feb 2003
Posts: 2,138 tucson az
frank
OP
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OP
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Quote:
Do you have a pcv valve on the car?
Are the baffles in the valve covers?
No PCV valve and the valve covers have baffles
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Re: Oil blowing out of breather
[Re: lewtot184]
#1704019
11/27/14 09:57 PM
11/27/14 09:57 PM
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Joined: Jun 2013
Posts: 240 Ft. Wayne, IN.
QTR MILR
enthusiast
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enthusiast
Joined: Jun 2013
Posts: 240
Ft. Wayne, IN.
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Could be a bad head gasket.... Been there done that...
Scott
69 Satellite, 3650lb street car... Dunnuck Racing pump gas 440. Best of 10:60@127...
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Re: Oil blowing out of breather
[Re: RapidRobert]
#1704021
11/28/14 11:48 AM
11/28/14 11:48 AM
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Joined: Feb 2003
Posts: 2,138 tucson az
frank
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OP
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Joined: Feb 2003
Posts: 2,138
tucson az
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Quote:
Quote:
No PCV valve
What do you have for crankcase ventilation? If none at all, just normal blowby will cause your symtoms
Just the breather. I cant find a PCV that fits in this valve cover. Engine has 300 miles and runs perfect
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Re: Oil blowing out of breather
[Re: frank]
#1704022
11/28/14 01:15 PM
11/28/14 01:15 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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You must have a PCV system hooked up otherwise you run the risk of blowing out gaskets and it will always leak oil no matter how many breathers you have, imo.. Here's how I did it 25 years ago with cast valve covers. Drilled the right sized hole for the grommet with a hole saw. And bolted in this baffle. I used this valve cover for 20+ years on my car. The baffle worked great. I learned about PVC valves on my first 340 which came with these cast covers with no PCV hole. They were black and shinny like yours. I fought oil leaks for a while until a mechanic told me it needed it. So drilled that hole and got a grommet out of a stock valve cover and it stopped my oil leaks and more. Made a difference for the good and I became good friends with that mechanic. You can get that grommet at most "help" sections at auto parts stores. All PCV grommets were the same in those years.
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Re: Oil blowing out of breather
[Re: Challenger 1]
#1704024
11/28/14 04:11 PM
11/28/14 04:11 PM
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Joined: Jan 2003
Posts: 15,462 Omaha Ne
TJP
I Live Here
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I Live Here
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Omaha Ne
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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.
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Re: Oil blowing out of breather
[Re: frank]
#1704025
11/28/14 06:00 PM
11/28/14 06:00 PM
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Joined: Aug 2003
Posts: 43,252 Bend,OR USA
Cab_Burge
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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
Last edited by Cab_Burge; 11/28/14 06:01 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Oil blowing out of breather
[Re: Cab_Burge]
#1704026
11/28/14 06:22 PM
11/28/14 06:22 PM
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Joined: Feb 2003
Posts: 2,138 tucson az
frank
OP
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OP
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Joined: Feb 2003
Posts: 2,138
tucson az
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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
Could you please
Appreciate all the information
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Re: Oil blowing out of breather
[Re: frank]
#1704027
11/28/14 07:29 PM
11/28/14 07:29 PM
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Joined: Jan 2003
Posts: 15,462 Omaha Ne
TJP
I Live Here
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I Live Here
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Omaha Ne
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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
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Re: Oil blowing out of breather
[Re: Cab_Burge]
#1704031
11/28/14 11:16 PM
11/28/14 11:16 PM
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Joined: Feb 2003
Posts: 2,138 tucson az
frank
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OP
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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?
No only one breather. Torque plate was used on this engine. The break in was done on the dyno. I didn't use a PCV because I could not find one to fit these MP valve covers.
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Re: Oil blowing out of breather
[Re: RapidRobert]
#1704032
11/28/14 11:24 PM
11/28/14 11:24 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
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Cincinnati, Ohio
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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.
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