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crankcase ventilaion by-pass idea 200 1988

posted by  someone claiming to be Bill N. Hartofrd, 53037 on  Mon Oct 29 14:22 CST 2018 [RELATED]

Can I drill a 1/4 inch vent hole in the oil-filler cap on top of the Valve Cover to by-pass the crank case over-pressure issue? Or, it there a better way to avoid over-pressure in the engine?








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    crankcase ventilaion by-pass idea 200 1988

    posted by  I-5 Librarian on  Sun Nov 11 00:22 CST 2018
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    Perhaps you should look into (link) cleaning your flame trap.







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      crankcase ventilaion by-pass idea 200 1988

      posted by  jwalker on  Sun Nov 11 06:47 CST 2018
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      last visit: Fri Jun 6 08:39 CST 2014
      [RELATED]

      Agreed, I suggest testing/checking all the PCV components for clogs and replace or clean those parts.

      Unless it is new, replace the flame trap screen, check for clogs in the flame trap hoses, the breather box and its hose. Replace or clean any clogged parts and then test for airflow.

      I tossed the flame trap screen on both 90 240 and 95 850 without any issues. It really isn’t necessary IMHO. It just causes clogs. Volvo stopped using them by 1998? and released a service update stating exactly that.
      --
      Will I buy another Volvo??? We'll see....








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        crankcase ventilaion by-pass idea 200 1988

        posted by  Bill N. on  Sun Nov 11 13:26 CST 2018
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        last visit: Sat Aug 16 14:09 CST 2014
        [RELATED]

        I did toss the flame trap screen and checked for good flow through all the line and now am happy with that and am good to go!








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    crankcase ventilaion by-pass idea 200 1981

    posted by  81242DLB21FCA on  Sat Nov 10 22:13 CST 2018
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    last visit: Thu Oct 23 22:26 CST 2014
    [RELATED]

    My opinion on the crankcase vent system is you want to suck out from the crankcase any fuel or water condensation that becomes vapor when the engine heats up. However, connecting just a hose from crankcase to intake may suck a lot of atomized oil during engine over run when the oil is hot. That oil is then going onto the intake valves and into the combustion chamber to become carbon.

    I like a good (large) catch can to separate the oil from the vapors that you do want to burn. Also, you should include an inline check valve to prevent the possibility of a back fire into the intake from going to the crankcase.







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    crankcase ventilaion by-pass idea 200 1988

    posted by  james_a_sousa on  Mon Oct 29 18:18 CST 2018
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    last visit: Thu Oct 23 18:51 CST 2014
    [RELATED]

    Crank case over pressure has long been an issue with almost all engines.

    Simple systems consisted of a vent tube about 3/4 inch from the crankcase (low on the side of the engine) that pointed downward and was open to the atmosphere.

    Later systems consisted of a hose back to the cars carburetor.

    Your car surely has some sort of system, and it is clogged.

    Try the 700/900 FAQ.

    A mechanic told me that my '988 745 GLE had a 240 engine, so I am pretty sure that the FAQ will help you - also, since the FAQ is very extensive, this FAQ will help you with many issues.






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