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| oil out breather? https://slantsix.org/forum/viewtopic.php?t=18336 |
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| Author: | JohnnyDees [ Sat Jul 01, 2006 3:51 pm ] |
| Post subject: | oil out breather? |
I hate to bring this out again but.. Oil is coming out my breather on my 66 Dart. It comes out pretty heavy sometimes. I looked thru the old posts and tried these things...Compression = 142,142,142,150,150 and 142. Good suction from carb to pcv. plugs are all tan, no oil. no knocking noises. Slight oil from exhaust at start up and sometimes leaving from stop sign. Seals? Would it be rings with good compression and no oil on plugs? |
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| Author: | emsvitil [ Sat Jul 01, 2006 4:03 pm ] |
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Too much blowby would do it as the crankcase air can't make it thru the PCV valve and comes out the breather.... |
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| Author: | SlantSixDan [ Sat Jul 01, 2006 4:20 pm ] |
| Post subject: | |
Excessive blowby would certainly do that, but it would be unusual to find excessive blowby with excellent compression and clean spark plugs. Let's see if we can't narrow in on the problem. First question: What kind of valve cover are you running? Is it a stock cover with stock oil cap setup, or is it an aftermarket item? If aftermarket, which type? Next question: If you remove the breather with the engine running, and place the palm of your hand firmly over the breather hole in the valve cover, what happens? Do you eventually feel suction from the PCV system, or does pressure build up and try to force your hand off? |
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| Author: | JohnnyDees [ Sat Jul 01, 2006 5:04 pm ] |
| Post subject: | |
It is a stock cover with a chrome push in breather. I'll try the test tomorrow? |
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| Author: | JohnnyDees [ Sun Jul 02, 2006 8:07 am ] |
| Post subject: | |
I put my hand over breather hole. At idle there is suction. revving it makes suction less with maybe a little positive pressure but its hard to tell. revving it produces smoke which is not really blue or white and does not smell like oil, but at idle there is nothing. Could this be some type of head gasket problem? Last year it ran cool but did push oil out breather, this year its running hotter(just started) small leak in radiator. Could pressure in radiator be causing leak? |
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| Author: | AndyZ [ Sun Jul 02, 2006 12:58 pm ] |
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I seem to remember a similar problem. Turned out it was clogged oil passages to some of the rockers except the one under the breather was flowing heavy. But typically this is a blow by issue, excessive ring wear, broken rings etc but you may want to pull off the valve cover and check it out after you try Dans suggestions. Best of luck |
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| Author: | JohnnyDees [ Sun Jul 02, 2006 1:14 pm ] |
| Post subject: | |
Changed out radiator for spare. No more radiator leak. But I do need a water pump. (Maybe I'll change everything between the grille and the firewall) |
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| Author: | HyperValiant [ Mon Jul 03, 2006 8:43 pm ] |
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I am having similar condition with my 63 Dart but it does smoke at idle and doesnt have oil coming out of the breather,and the plugs look normal and the compression is good so im guessing the valve guides are worn.The reason Im thinking this is that the rocker arms were not oiling well when I bought the car and the valve guides pre maturely wore due to lack of oil.I have a frsh head ready to bolt on but am concerned about installing a good head on a 116000 mile engine.Any body have any suggestions? HyperValiant |
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| Author: | JohnnyDees [ Tue Jul 04, 2006 11:11 am ] |
| Post subject: | |
Decided to remove head. Head gasket was steel, no bad damage but it did look like maybe some white powdery paths to the front water jacket. Cylinders not scored but did have a little bit of a ridge. 8 valve seals were completely gone.valve guides are nice and tight though. Valves look good to. Also #1 cylinder had sluge on top of piston not hard carbon like the rest. #1 also had the biggest carbon on the valves of any cylinder by far. Is the original steel gasket thinner than a Fel-Pro? (Maybe mill some and port?) Decisions....decisions... |
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| Author: | JohnnyDees [ Tue Jul 04, 2006 11:51 am ] |
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Thr ridge on a couple of cylinders is kinda thick and has lots of carbon. maybe is all carbon? |
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| Author: | Joshie225 [ Tue Jul 04, 2006 2:14 pm ] |
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Use some carb cleaner on a rag and see how much "ridge" comes off. Also, nothing you do to the head will help blow-by as excessive blow-by is purely a ring-cylinder problem. I've had a couple of slants with broken top rings that ran ok and didn't even smoke, but had plenty of blow-by and used oil. How did you check valve guide wear? Pushing the valve side-to-side is ok as long as the valve and guide have been cleaned. Having the springs off goes almost without saying. Putting valve seals in will help oil consumption, but will do nothing for the blow-by. To summarize, blow-by is a ring job at a minimum. Oil usage withou blow by is typically valve guides and or valve stem seals, but can also be worn ring lands allowing oil pumping while still sealing combustion pressure. |
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