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Engine oil coming out dipstick tube |
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Hollandherder 
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Joined: May/19/2018 Location: Rathdrum Idaho Status: Offline Points: 10 |
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 Topic: Engine oil coming out dipstick tubePosted: Jun/27/2018 at 8:09pm |
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I have a 258 in a 77 Hornet that has oil seeping out the dipstick tube. Anyone have any ideas what would be causing this? Blowby on cylinder? Bad PCV valve?
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tyrodtom
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Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6213 |
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Posted: Jun/27/2018 at 8:18pm |
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Do you mean at the top of the tube? Or where the tube goes in the block ?
Just a little mist that's vaporizing into liquid, or oil clear to the top ?
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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Hollandherder
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Joined: May/19/2018 Location: Rathdrum Idaho Status: Offline Points: 10 |
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Posted: Jun/28/2018 at 12:54am |
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Oil clear to the top
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rms827
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Joined: Apr/18/2018 Location: California Status: Offline Points: 378 |
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Posted: Jun/28/2018 at 5:50am |
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Surprised nobody's even ventured a guess here... A few possibilities come to mind here: Overfilling is the most obvious. Even enough to cover the crank partially can create splashing that might throw oil up the dipstick tube. I suppose a big enough dent in the oil pan could raise the level of the oil enough to create a fake overfill condition. Excessive oil pressure came to mind when I first read this but I'm not sure that's a valid possibility The other answer is that there's compression escaping into the crank case somehow (ie a blown head gasket or crack in the engine) and that pressure is pushing oil up the tube. I'd think you'd notice performance issues there, and should be able to feel pressure putting your hand over the opening for the oil fill cap with the engine running. The only other time I recall hearing of something similar was an incident where a supercharger was pushing air into the crank case due to faulty installation. Obviously that's not going to apply here.
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1964 AMC Rambler Classic 660
"You can think I'm an idiot, just don't talk to me like I'm one." - Batman |
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tyrodtom
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Posted: Jun/28/2018 at 6:20am |
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If it's oil clear to the top, If you haven't drastically overfilled it , I'm thinking something is displacing the oil in the crankcase.
Ruptured fuel pump diaphram, letting gas enter the crankcase. Does the oil have a smell of gas? A blown head gasket, or crack in the block or head would let coolant dilute the oil. If either is true, they can ruin a engine quickly. Wipe out you rod and main bearings, scuff the cylinder walls. Even overfilling can ruin a engine, the crank going thru the oil will turn it to a foam, that won't do a very good job of lubricating anything.
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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rms827
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Posted: Jun/28/2018 at 6:24am |
Good points, Tom.
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1964 AMC Rambler Classic 660
"You can think I'm an idiot, just don't talk to me like I'm one." - Batman |
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POS #1
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Posted: Jun/28/2018 at 12:45pm |
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Blow by.. most likely needs minimum, set of rings and a good hone, but plan on a total rebuild, including bore and pistons ... imo been down that path several times with V-8's
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Doug in New Freedom
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Joined: Aug/02/2014 Location: NEW FREEDOM, PA Status: Offline Points: 149 |
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Posted: Jun/28/2018 at 3:52pm |
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I had a Gremlin that the water pump went bad and ground away the front area of the block at the timing chain if I recall. This then pumped water into the oil causing over filling. Check the color of the oil to see if it's milky and also the radiator.
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Doug in New Freedom
68 AMX 69 CHEVY C1O PICKUP 74 PORSCHE 914 84 K5 BLAZER |
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tyrodtom
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Posted: Jun/28/2018 at 6:16pm |
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I think something has been lost in translation.
Is the dipstick tube full of oil up to the top of the tube ? Or just a little oil making it up to the top of the dipstick tube ? |
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66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.
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First_Gear
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Joined: Jan/18/2010 Location: Mukilteo WA Status: Offline Points: 644 |
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Posted: Jun/28/2018 at 7:16pm |
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I had an old nova that did this. Just sprayed oil out of the dipstick tube wherever I drove. It was excessive blowby from an old engine in my case.
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tyrodtom wrote: