Maybe the piston rings are worn out, and pressurizing the crankcase.
If so, it is time to tear it down...
It is not that hard, but it is a bit of work.
Can you (or someone else) do a compression test on it?
Or a leakdown test?
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| Breather oil blowby https://slantsix.org/forum/viewtopic.php?t=12893 |
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| Author: | Viking [ Sat May 07, 2005 9:55 am ] |
| Post subject: | Breather oil blowby |
Hey folks...at the risk of starting another 74 page post that gets waaaay off track(as found in the old posts), I have a problem with my '71 Dart. it keeps on sucking oil thru the breather into the air filter, fouling the filter and causing the engine to run really rich. It has done this since I bought the car 2.5 yrs ago, when it only had ~32K miles on it. I now have ~ 44K miles on her, and it's getting to be a real drag. I realize that it's related to pressure in the crankcase, my PCV valve is good (and has been replaced a few times), but even after reading 4+ pages of the old post, I don't know what causes the over pressurization, and how I can get fix it. Someone suggested that there was an additive that I could use to help mitigate the problem, but I'm loath to start adding junk into her, if I don't have to. Any fix suggestions would be most appreciated! BTW, great site!!! |
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| Author: | Rust collector [ Sat May 07, 2005 10:18 am ] |
| Post subject: | |
Maybe the piston rings are worn out, and pressurizing the crankcase. If so, it is time to tear it down... It is not that hard, but it is a bit of work. Can you (or someone else) do a compression test on it? Or a leakdown test? |
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| Author: | SlantSixDan [ Sat May 07, 2005 3:37 pm ] |
| Post subject: | |
What kind of valve cover are you running? Stock 3-hole, or an aftermarket (maybe chrome) one? How old/good is the breather itself? And have you verified that you've got good, strong suction through the PCV line by removing the valve from the valve cover and putting your finger over the end with the engine idling? Try this: Remove the breather hose from the breather, and remove the PCV valve from the valve cover. Put your finger over the PCV valve grommet hole in the valve cover to stop-up that hole. Now put the palm of your hand over the breather fitting with the engine running at a fast idle. If significant pressure builds up, you've got internal engine problems (stuck or broken rings, probably). You can try to free them up with Kroil(!) in the cylinders and assorted other chemical tricks, but you'll most likely wind up doing a rebuild. |
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| Author: | Eric W [ Sun May 08, 2005 12:40 am ] |
| Post subject: | |
I had the same problem with my original engine in my '72 Satellite. One cylinder had 20psi, the rest around 110psi. Worn rings causing excesive crank case pressure, over powering the PCV and going out the breather cap into the air filter. It was so bad, I had to change the air filter every week (80 mile round trip to work daily)! Time for a rebuild. Yes, your engine has low miles, but 44K miles isn't alot in 34 years, so some sitting must have happened some time in its life....not good as corrosion can set in, and wreck havoc inside an engine. |
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| Author: | Viking [ Mon May 09, 2005 5:29 am ] |
| Post subject: | Breather problem |
You guys are making me sad...I don't want to do a rebuild just now! Thanks for the ideas, hopefully later this week I'll have a chance to do some more investigation work on the old gal... |
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| Author: | ShivaDart [ Mon May 09, 2005 7:30 am ] |
| Post subject: | |
you could always drive around with the problem  Wierdos and their "car must be working well" ailments 
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| Author: | Slant6Ram [ Mon May 09, 2005 8:18 am ] |
| Post subject: | Breather? |
Is a breather really necessary?  Honestly, my truck doesn't connect the breather to the air filter housing. Instead, there is a long hose that hangs down near the ground to vent blowby. (protecting my truck's underside from corrosion.) It's certainly not the enviornmentally correct way to go, but I can only do so many things at once. My engine doesn't really have much blowby any more, now that my PCV valve is corrected. I see that you've replaced the PCV valve, and I suspect that you have already checked out the PCV system, but just in case, make sure the PCV port on the carb isn't clogged or blocked by an incorrect gasket. (which was the problem with my truck in the first place) |
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| Author: | skraecken [ Mon May 09, 2005 9:15 am ] |
| Post subject: | |
| In my experience the /six is very sensitive if you put to much oil in the engine, keep it between low and full, and not near the "full" mark. |
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| Author: | SlantSixDan [ Mon May 09, 2005 9:30 am ] |
| Post subject: | |
Quote: In my experience the /six is very sensitive if you put to much oil in the engine, keep it between low and full, and not near the "full" mark. |
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| Author: | skraecken [ Tue May 10, 2005 12:07 pm ] |
| Post subject: | |
 Do not entirely agree with you, but what the "h" you may be right to! |
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