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Old 09-08-2002, 06:13 PM
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Post breather leaking oil

I have recently purchase a 67 Camaro with 496 stroker. Over the week end I started out on a what was to be 40 mile trip and well 15 miles into it all kinds of smoke was coming from the back. Pulled over to check it out and noticed that oil is leaking out from the breathers on the valve covers, one side more than the other. The breathers are the push in filter type. Are breathers not sealing properly or what. Should I just by new valve covers and breathers or do I have bigger problems? Thanks for any help in advance.

Charlie

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Old 09-08-2002, 06:43 PM
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The best way to eliminate this situation would be to get rid of one of the breathers and add a pcv valve to your system. The pcv valve would force fresh air to be drawn into the breather on the opposite valve cover. Be aware that adding a pcv valve will lean out your fuel ratio. You may or may not have to re-jet your carb. You should also make sure that there are baffle plates under the valve cover holes. Most quality aftermarket valve covers come with these. You can run without a pcv but any blow-by is going to tend to make a mess out of your valve cover.
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Old 09-09-2002, 06:47 AM
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I hate to be the bearer of bad news, but . . . if the engine is blowing that much oil out of the breathers, you probably have a serious blowby problem. Blowby is caused by cylinder pressure getting past the rings and/or the valve guides. A shop that has a leakdown tester can tell you if this is a problem and can pinpoint whether it is a ring or valve problem. Good luck.

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Old 09-09-2002, 10:30 AM
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i think morris steered you right. w/o a pvc your looking at oil all over the place. two breathers <img src="graemlins/nono.gif" border="0" alt="[nono]" />
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Old 09-09-2002, 10:59 AM
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Remember tho, there was a time when engines didn't have PCV valves. 265, 283 Chev engines had a "draft tube" that came out of the intake manifold valley and vented towards the ground next to the bellhousing. The best PCV system in the world will not overcome a bad blowby situation. RS, try removing the breather and put your hand or a rag over the hole. You might be surprised at the pressure coming out of there whild the engine is running. Hey, maybe a PCV valve will help your situation, but I think you are facing more serious repairs.
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Old 09-09-2002, 11:15 AM
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The crankcase must be ventilated, whether PCV, road draft or vacuum pump. Breathers will not ventilate, they only relieve crankcase pressure, along with anything else floating around down there.

Install the correct PCV system before anything else. The valve should be located towards the front of the rocker cover (with baffle) so that the vacuum doesn't draw motor oil up when it puddles on hard acceleration.

Of course, you will need a fresh air source on the opposite side (rocker cover).

[ September 09, 2002: Message edited by: KULTULZ ]</p>
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Old 09-09-2002, 05:43 PM
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Hey guys, thanks for the advice. I got a pcv valve put in and being that it is to late to take it for a drive (too loud and piss off all the neighbors at 9:30 around here) I'll have to try it out tomorrow. Hopefully it'll work because the Super Chevy Show is this coming weekend and I'd like to drive it there. Hopefully I didn't buy a trailer queen. I have taken it on short drives through town without any problems and over the weekend was the first time I had driven that far at 55 to 60 miles per hour. Thanks again and I'll let you all know how it works out.

Charlie
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