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Old 10-19-2020, 02:43 PM
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Default Sudden Oil Consumption

I've go around 1300 miles on the engine after a total rebuild and it's suddenly started burning some oil. It's mainly on start-up but starting to notice some smoke at idle now. For the first ~1100 miles, there was no consumption at all... Compression is still strong on all 6 (and even) so I don't think it's rings. What else could be causing this? Thanks as always!

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Old 10-19-2020, 07:58 PM
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Valve seals and/or guides? Was the head rebuilt also?

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Old 10-19-2020, 09:38 PM
Chief of the 60's Chief of the 60's is offline
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It could still be the rings. Just because you have compression doesn't mean you didn't crack an oil ring.

But before you get all willy nilly on it and tear it down, check the PCV system. I have seen systems plug and use oil and I once had a PCV valve come apart internally and the system was sucking the oil out of the engine. I used up 4 quarts of oil in about 120 miles all because of a bad PCV valve. Now, it uses less than a pint between oil changes.

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Old 10-20-2020, 06:47 AM
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For a quick check of the PCV swap the hose out with a clear rubber hose.
This will show you if the oil is being sucked in.

The home center box stores should have the hose needed.

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Old 10-20-2020, 10:47 AM
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I narrowed it down to the PCV system on a whole... Since my oil filler tube was messed up I decided to cut it short which initially was letting oil escape past the oil cap and run down the engine. So, I used a stainless steel scouring pad to fill the remainder of the tube in hopes of slowing down the escaping oil. That worked a little too well effectively plugging the tube and not allowing the crank case to breathe. That caused the PCV to suck too hard on the crank case gumming up the valve. I've now taken the steel mesh out of the filler tube and installed a K&N breather cap on the top, cleaned out the PCV and replaced the hose. Initial drive afterward proved to be a lot better. Now I'll change the plugs and hope that the residual oil in the intake burns out fairly quickly. Thanks for the pointers once again... this thing has been a pretty steep learning curve for me!

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Old 10-20-2020, 06:18 PM
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Just pick up some SS screen and roll your own,

Oil tube splash screen.

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Last edited by Jeff Hamlin; 02-26-2024 at 07:17 AM.
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Old 10-21-2020, 11:31 AM
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I would gladly go that route but I don't have a full length tube anymore...

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Old 10-21-2020, 06:50 PM
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Unless I'm misunderstanding if you still have the lower section the screen only goes up into the tube just to where you see that small dimple.

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Old 10-21-2020, 07:59 PM
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Quote:
Originally Posted by 63 bomb View Post
I would gladly go that route but I don't have a full length tube anymore...
?????

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Old 10-22-2020, 06:54 AM
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Arrow FWIW...

... It's about 4.5" from the base of the block up to the top edge.
Then just add the distance from tube stop-rim up to dimple.
If you cut your tube down but are still above dimple you should be good.

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When I die, I want to go peacefully like my grandfather did, in his sleep.
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Last edited by Jeff Hamlin; 02-26-2024 at 07:17 AM.
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Old 10-22-2020, 09:59 AM
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You can see in this pic what I'm working with. The only difference now is that I've removed the standard cap and put a K&N breather filter in its place.
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Old 10-22-2020, 10:25 AM
Chief of the 60's Chief of the 60's is offline
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So this is in a Chevy II?

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Old 10-22-2020, 10:48 AM
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If you want a full length stock oil tube, I can send you one for the price of shipping.

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Old 10-22-2020, 10:55 AM
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Quote:
Originally Posted by Chief of the 60's View Post
So this is in a Chevy II?
Yes it is.

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Old 10-22-2020, 10:57 AM
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Quote:
Originally Posted by camerjeff View Post
If you want a full length stock oil tube, I can send you one for the price of shipping.
That would be great! PM sent...

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