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Thread: SA 250 blow by/puking oil

  1. #1
    Join Date
    Nov 2012
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    SA 250 blow by/puking oil

    just got this sa 250 running with Perkins 5000 hrs , had hell of algae in tank which finally getting clear /clean(recommend Diesel Clear product ), used temp tank got running got very high oil pressure pegs 80 psi that has blow by and puking oil out valve cover vent ,guessing rings stuck or broken and oil relief valve is stuck ?, so change oil and added liquids Molly oil treatment and lucas oil stabilizer , think oil pressure supposed to be 40 to 60 ? so is there inline PVC vent that could add to keep oil in engine and let vent gas release ?

  2. #2
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    May 2008
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    Re: SA 250 blow by/puking oil

    With that much blow by and crankcase pressure you could be looking at a burnt piston. My experience with stuck/broken rings is insufficient compression for ignition along with the excessive blow by.
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  3. #3
    Join Date
    Nov 2012
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    Re: SA 250 blow by/puking oil

    runs and welds good ,no smoke that see blowing out exhaust can deal with blow by , but oil coming out breather tube ,will run little more before trying tear into it

  4. #4
    Join Date
    Feb 2022
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    Re: SA 250 blow by/puking oil

    the perkins I just rebuilt oil pressure is 75 lb. I haven't run it long enough yet to see what it drops to when it gets hot

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  5. #5
    Join Date
    Feb 2022
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    Re: SA 250 blow by/puking oil

    it is not blowing oil out the tube however.

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  6. #6
    Join Date
    Nov 2012
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    Re: SA 250 blow by/puking oil

    okay thanks , did you do inframe rebuild?

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