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Thread: Oil pressure issue

  1. #1

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    Oil pressure issue

    Im having an oil pressure issue im hoping someone can shed some light on. This is on a Continental C90- 8 mid time with 25 SMOH cylinders using Aeroshell 100 mineral oil. 75 percent of the time with the oil temp stabilized at 180 degrees I am getting about 39 pounds of oil pressure. About 25 percent of the time with the same oil temp I am getting about 32 to 34 pounds of oil pressure. The change in oil pressure never occurs in flight , only after shutdown and restart. The problem is evident at start up as the pressures are lower across the board from start up, cruise and hot idle. The oil pressure gage is a steam gage and didnt have any indication issues with the last engine that was removed 25 hours ago. The PRV spring is new and there is one washer istalled. Any insight would be greatly appreciated.

  2. #2
    cubdriver2's Avatar
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    Try bleeding the line at the gauge with the engine running, might be airbound?
    If you live in a cold place fill it with Kero or Diesel

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"

  3. #3

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    Thanks I'll give that a try . I haven't done that yet. Im in kodiak and its cool even this time of year.

    Dan

  4. #4

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    Quote Originally Posted by cubdriver2 View Post
    If you live in a cold place fill it with Kero or Diesel

    Glenn
    In a similar vein, I have chronically high (indicated) oil pressure (90 to 95 PSI). Would the gauge indication change (lower) if I were to fill the line with kerosene/Jet A? Or would it make any difference at all?
    The pressure relief valve (old type) is adjusted as far as it can go.
    Last edited by NunavutPA-12; 06-26-2021 at 02:46 PM.

  5. #5
    BC12D-4-85's Avatar
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    I had some pressure slow startup and later variability on my C-85 Stroker. The A&P flushed the line with brake cleaner and refilled with M-5606 hydraulic fluid (had a squirt container handy) then bled it a little at the gauge. Lots of built-up oil and carbon crud was flushed out. Seemed ok after.

    At the engine or in the gauge could be other issues however.

    Gary

  6. #6
    skywagon8a's Avatar
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    Quote Originally Posted by NunavutPA-12 View Post
    In a similar vein, I have chronically high (indicated) oil pressure (90 to 95 PSI). Would the gauge indication change (lower) if I were to fill the line with kerosene/Jet A? Or would it make any difference at all?
    The pressure relief valve (old type) is adjusted as far as it can go.
    Nice tight engine. My IO-360 runs at 89-90 all the time in warmer ambient temperatures than yours. Don't be concerned.
    N1PA
    Thanks NunavutPA-12 thanked for this post
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  7. #7

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    When I assisted rebuilding my 0-320 we assembled on the snug side if tolerances. My initial press was up around 100psi
    I put a adjustable oil pressure relief and run at 80 psi


    Sent from my iPhone using SuperCub.Org
    Thanks NunavutPA-12 thanked for this post

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