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post #1 of 26 (permalink) Old Feb 8th, 07, 09:15 AM Thread Starter
 
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valve cover breather leaking oil

I have a 68 Camaro with a sb 400. It has a working pvc on the pass. side and a breather/oil fill on the driver's side. When I drive the car for any distance, oil leaks from the breather. I have installed a new baffled grommet, but oil still leaks out. My rpms are running around 2600 at 70mph. Any suggestions or ideas ? Thanks in advance>........Maro68
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post #2 of 26 (permalink) Old Feb 8th, 07, 09:25 AM
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Re: valve cover breather leaking oil

Does the breather fit snug into the grommet? I have had some breathers that were poorly made and didn't fit as snug as I would have liked which caused some leakage.. The other problem you might have which would cause this is poorly manufactured valve covers that do not have a baffle below the hole causing the valves tho throw oil up... quite frankly there should be very little oil making its way to that grommet if the valve cover is manufactured properly.

1969 Z/28 CLONE 350
4 SPD MUNCIE,
4 WHEEL DISK BRAKES,
4:11 POSI
BLUE W/WHITE STRIPES


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post #3 of 26 (permalink) Old Feb 8th, 07, 09:39 AM
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Re: valve cover breather leaking oil

With the PCV valve in the drivers side cover the air flow through the engine should be from the breather on the pass side cover through the crankcase and out the pcv to the base of the carb.

Other than splash (stopped by baffle or that baffle gromet you installed) you should not be seeing oil in the breather. Either you have a plugged or wrong PCV valve, very little vacuum or your engine is very tired causing what is called blow by...

Kyle - many high dollar valve covers don't come with baffles and typically are not drilled for breathers. You are correct though that there are some low dollar chrome and alum covers that have 1 or 2 holes manufactured in them and no baffle. Still should only be a problem on the driver side...

...Dennis

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post #4 of 26 (permalink) Old Feb 8th, 07, 10:07 AM
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Re: valve cover breather leaking oil

I fought a similar problem for years... and learned a lot from experimenting and asking questions here.

The best "street" valve covers have the grommet hole located "in between cylinders" that is, in the gap between the first the first 2 intake valves.
These valve covers will usually have a sheet metal baffle that extends down to near the bottom of the cover.

Valve covers that have the hole right over the first pair of rockers are going to be a problem no matter what you do.

In my case, I eventually found excessive blowby was due to shattered compression rings on #2.





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post #5 of 26 (permalink) Old Feb 8th, 07, 10:54 AM Thread Starter
 
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Re: valve cover breather leaking oil

Hey guys, thanks for the replies.......The grommet is new a has a tight fit. I'll check to make sure there is a baffle in the cover. These chrome covers are cheap ones and have been on the car 4-5 years when the engine was rebuilt. Dennis, are you saying I need to swap positions with the pcv and breather tube to see if that helps?? Thanks again, I knew I could count on help here......
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post #6 of 26 (permalink) Old Feb 8th, 07, 11:17 AM
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Re: valve cover breather leaking oil

Davie - The natural flow of air through the engine is, in through the pass side and out the driver side. I picked up on the way you have it and then completely ignored it in my reply... Doh!

Yes, put the PCV valve in the drivers side and the breather on the pass side... Put a baffle or baffle gromet on under the PCV valve to reduce any oil being sucked into it and don't worry about the breather side...

...Dennis

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post #7 of 26 (permalink) Old Feb 8th, 07, 01:12 PM
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Re: valve cover breather leaking oil

Yeah i was hoping to avoid the ever sad discussion of blow-by which of course means a rebuild is inevitable. Lets hope for the best

1969 Z/28 CLONE 350
4 SPD MUNCIE,
4 WHEEL DISK BRAKES,
4:11 POSI
BLUE W/WHITE STRIPES


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post #8 of 26 (permalink) Old Feb 8th, 07, 01:38 PM Thread Starter
 
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Re: valve cover breather leaking oil

Thanks, again, Dennis and Kyle. I'll swap sides with the pvc and breather and if it IS blow-by...... a "CRATE" may be in the not too distant future!!!!
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post #9 of 26 (permalink) Old Feb 8th, 07, 03:36 PM
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Re: valve cover breather leaking oil

I used a trick I found while searching one day here on TC. I took an old sock, cut the end of it out, rolled it up and placed it between the breather and the valve cover. Can't really notice it on the engine, and no more leakage. Now, it is leaking from other places, and hopefully the cam swap/gasket replacement will fix all of that.

The sock trick works, and I have seen it on other cars as well.

Craig


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post #10 of 26 (permalink) Old Feb 8th, 07, 04:07 PM
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Re: valve cover breather leaking oil

Quote:
Originally Posted by Brackneyc View Post
I used a trick I found while searching one day here on TC. I took an old sock, cut the end of it out, rolled it up and placed it between the breather and the valve cover. Can't really notice it on the engine, and no more leakage. Now, it is leaking from other places, and hopefully the cam swap/gasket replacement will fix all of that.

The sock trick works, and I have seen it on other cars as well.
I was also going to suggest this, I did this back in the 70's and 80's ...be creative put a red sock on a red car etc.
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post #11 of 26 (permalink) Old Feb 8th, 07, 04:28 PM
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Re: valve cover breather leaking oil

I dont know about anyone else but i use valve covers with very tight baffles and they work good...BUT..it takes me about 4 days to fill it up with oil when i do an oil change. Those baffles dont let the oil run in very fast.


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post #12 of 26 (permalink) Old Feb 8th, 07, 07:00 PM
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Re: valve cover breather leaking oil

Quote:
Originally Posted by Brackneyc View Post
I used a trick I found while searching one day here on TC. I took an old sock, cut the end of it out, rolled it up and placed it between the breather and the valve cover. Can't really notice it on the engine, and no more leakage. Now, it is leaking from other places, and hopefully the cam swap/gasket replacement will fix all of that.

The sock trick works, and I have seen it on other cars as well.
I don't understand. How do you place it in there without it being noticed?
I'm having a difficult time picturing this. Its between the breather and the VC?
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post #13 of 26 (permalink) Old Feb 8th, 07, 07:43 PM
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Re: valve cover breather leaking oil

those little fuzzy bands that girls put there pony tails in work good too.





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post #14 of 26 (permalink) Old Feb 8th, 07, 08:16 PM
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Re: valve cover breather leaking oil

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Originally Posted by mkpatrick View Post
I don't understand. How do you place it in there without it being noticed?
I'm having a difficult time picturing this. Its between the breather and the VC?

You can see it, but it isn't such a big deal as to draw your attention right to it. In other words, it beats the hell out of having oil blowing all over the place.

Craig


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post #15 of 26 (permalink) Old Feb 8th, 07, 08:20 PM Thread Starter
 
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Re: valve cover breather leaking oil

I'll try the sock trick, too. Why didn't I think of that???? What a forum!!!!! Thanks Craig, for the tip.
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