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Old 12-18-2012, 10:26 AM   #1
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Low Oil Pressure

My '66 does not leak oil, however a small unnoticeable amount seems to seep out of the breather filter. After not having driven it in a couple weeks (due to poor weather conditions), my oil pressure was down to around 30-40 psi. Normally it's around 60-80. I checked the oil and sure enough: low. I added two quarts (I have a seven quart capacity (racing oil pan)), and that seemed like a lot of oil to be adding. I changed my oil about 2000 miles ago in June. Is this normal? How much oil does the average 302 burn in six months?
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Old 12-18-2012, 10:51 AM   #2
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Well my 302 burns oil a good amount to I have no idea what it could be so if you find out let me know lol hahah
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Old 12-18-2012, 11:03 AM   #3
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Have you pulled you plugs to see if they are oily? You may be getting blow by. You might be getting more than you think from the oil breather. But it doesn't make sense that it would lose oil just sitting there without any obvious pan or valve cover leaks.
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Old 12-18-2012, 11:05 AM   #4
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Right, and I was thinking there's no way that 2 quarts of oil have seeped through the breather in six months. I'll check the plugs and see what they tell me.
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Old 12-26-2012, 01:29 PM   #5
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Check the number 8 cylinder it's usually the culprit.
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Old 12-26-2012, 08:44 PM   #6
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Check the number 8 cylinder it's usually the culprit.
Why's that?
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Old 12-26-2012, 10:21 PM   #7
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I would make sure you pcv system is working. Make sure all the hoses are hooked up right and that the pcv valve is working. If not the system could be backed up and flowing the wrong way causing oil to get into your carb and make it look like your burning oil out the tail pipe. If not that it may be your valve seals leaking (you can't see this from the outside of the motor). Checking your spark plugs won't tell you where the oil is coming from though, just that your burning oil.
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Old 12-27-2012, 12:29 AM   #8
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You have to start somewhere, if you're not burning oil then it's leaking, if you're burning it then you have to further investigate. Pulling plugs is one of the simplest things to check and easy. Then move forward with more complex checks.
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Old 12-27-2012, 01:22 AM   #9
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Spun rod bearing?
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Old 12-27-2012, 09:11 AM   #10
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I would make sure you pcv system is working. Make sure all the hoses are hooked up right and that the pcv valve is working. If not the system could be backed up and flowing the wrong way causing oil to get into your carb and make it look like your burning oil out the tail pipe. If not that it may be your valve seals leaking (you can't see this from the outside of the motor). Checking your spark plugs won't tell you where the oil is coming from though, just that your burning oil.
Next time I have it out of storage to work on (hopefully this week or next) I'll inspect and clean the PCV. What is best to clean it with? Throttle body cleaner?

---------- Post added at 08:11 AM ---------- Previous post was at 08:10 AM ----------

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Spun rod bearing?
What do you mean exactly?
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Old 12-27-2012, 10:09 AM   #11
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Quote:
Originally Posted by Chaunceton View Post
My '66 does not leak oil, however a small unnoticeable amount seems to seep out of the breather filter. After not having driven it in a couple weeks (due to poor weather conditions), my oil pressure was down to around 30-40 psi. Normally it's around 60-80. I checked the oil and sure enough: low. I added two quarts (I have a seven quart capacity (racing oil pan)), and that seemed like a lot of oil to be adding. I changed my oil about 2000 miles ago in June. Is this normal? How much oil does the average 302 burn in six months?
Have you done a compression check on all the cylinders? There are only two ways to loose oil that I know of and someone already said them a leak or burn it. If there are no oil marks under the car and none on the frame or blow back then you are burning it. Simple checks to start

Check plugs for signs of burning oil
Check PVC to see if it is plugged and causing blow back into the engine
Check vacuum lines
Check radiator for signs of oil
Check compression
Look at tail pipe if it is black and not sooty with more of an oily feel
Is there any smoke at start up if so what color White is water vapor Gray is oil and Black is to rich
Check Tranny fluid
Is there an opening in the bottom of the Bell housing to see if the oil is getting in there from a bad rear seal

Good luck
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Old 12-27-2012, 10:46 AM   #12
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I'm not sure why the number 8 cy.l is weak maybe more heat in that area? But I know of a few guys that have problem with that cyl.
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Old 12-27-2012, 10:58 AM   #13
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Quote:
Originally Posted by Chaunceton View Post

Next time I have it out of storage to work on (hopefully this week or next) I'll inspect and clean the PCV. What is best to clean it with? Throttle body cleaner?

---------- Post added at 08:11 AM ---------- Previous post was at 08:10 AM ----------



What do you mean exactly?
The rod bearing maybe spun bc my friends Chevelle and his oil pressure took a nose dive and started using oil and it was a spun rod bearing
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Old 12-27-2012, 06:34 PM   #14
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Quote:
Originally Posted by Chaunceton

Next time I have it out of storage to work on (hopefully this week or next) I'll inspect and clean the PCV. What is best to clean it with? Throttle body cleaner?

---------- Post added at 08:11 AM ---------- Previous post was at 08:10 AM ----------



What do you mean exactly?
Just some break cleaner would be good it's safe on rubber metal and plastics
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Old 12-27-2012, 09:57 PM   #15
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PCV valve is inexpensive enough that you should just replace it. I've never cleaned one.
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Old 12-28-2012, 04:37 PM   #16
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PCV valve is inexpensive enough that you should just replace it. I've never cleaned one.
Good to know man thanks.
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