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Old 04-10-2004, 08:26 PM
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oil coming up through dipstick tube

how is everyone? i have problem i just finshed rebuilding my big block chevy but when i get on it oil is forced up the dipstick tube.the pcv is new and i have a breather cap in the other valve cover could it be blow by how can i check for that any help would be great. thanks guys

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Old 04-10-2004, 08:39 PM
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Generally that is a sign of a broken ring or damaged piston. Start with a compression test. That should narrow it down to the problem cylinder.
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Old 04-10-2004, 08:58 PM
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I'm with Tom, a PCV valve can't handle bad blow-by.
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Old 04-10-2004, 09:01 PM
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i kinda have the same problem, SBC 305 just rebuilt. i forgot to put the dip stick in the tube and some oil came out, with no dip stick in the tube is that normal for the oil to come out? or should i pull the engine apart?
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Old 04-10-2004, 10:42 PM
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I had the same problem on my 94 Z-28. I did a compression check first and all cylinders varied from 140psi up to 190 psi, so I figured a broken or stuck ring. Turns out it the ring land between the first and second ring was broken on 6 out of 8 pistons. Turns out the previous owner rebuilt the motor with cast pistons and 10 psi of boost torn them up. A compression check will definately give you an idea of what's wrong
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Old 04-10-2004, 11:42 PM
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Have you really given the engine enough time to seat the rings? The problem is blow-by, but maybe the rings just haven't seated yet. And don't forget, the PVC valve is made to only work at high vacuum, and by its nature, shuts down at full throttle. This is why it's helpful to vent the engine to the air cleaner instead of just atmosphere. While there isn't much vacuum present in the air cleaner, there is a little, and that's better than none - and it will probably help your problem.
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Old 04-11-2004, 02:28 AM
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Try leaving pcv valve in and hooked up to the carb or aircleaner or wherever, then pull out the breather on the other side of the engine. Put your thumb over the hole and see if you have a positive or a neg pressure. It should suck not blow out. Maybe a ring or two upside down even? That shouldnt allow that much blowby but..... strange things happen. The rings in upside down happens more often than alot of people admit. I did it on my first home rebuild (many moons ago) myself.
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Old 04-11-2004, 08:49 AM
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Quote:
Originally posted by lust4speed
Have you really given the engine enough time to seat the rings? The problem is blow-by, but maybe the rings just haven't seated yet. And don't forget, the PVC valve is made to only work at high vacuum, and by its nature, shuts down at full throttle. This is why it's helpful to vent the engine to the air cleaner instead of just atmosphere. While there isn't much vacuum present in the air cleaner, there is a little, and that's better than none - and it will probably help your problem.
I don't think it's a problem of the rings not being seated. If the rings aren't seating now, they never will. If the rings are sealing that badly, it will have to be fixed anyway (re-honing, etc.).

tom
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Old 04-12-2004, 03:12 PM
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I had a similar problem with my car did a comp. check all cylinders were right on with each other around 200 205, I ended up putting an evacuation system on my car from summit cured my problem.
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Old 04-12-2004, 03:32 PM
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But, then again you own a Ford and so it would help when you back off the throttle.

This guy sounds like he has eight quarts of oil in a six quart pan. Probably synthetic too! If you have low rise valve covers make sure that you don't push the PVC and breather all the way down to the lifters. And if you have non- stock valve covers, make sure they are the baffled type. You say that the oil is being "forced" out, like pushing the dipstick out? or just seeping? Is it the correct dipstick tube? Your turn!
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Old 04-12-2004, 09:10 PM
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well i am back its turkey season took time hunt do have tall valve covers after market dip stick never used synthetic oil wouldn't pour it on my motorcycle chain i believe the dip stick tube was the problem during the long rebuild sometime i may have checked the oil which was not on the stick so i must have added more so i changed the oil and filter put in 6 quarts then i checked the oil still not on the stick so i cut the tube till i hit the full mark. hope it works.
thanks everyone for the info

Last edited by stoneyone2001; 04-12-2004 at 09:17 PM.
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