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Thread: 10pt Oil Pressure Change

  1. #1

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    10pt Oil Pressure Change

    Question… I have a new to me Cub that over the last couple of months has lost about 10 psi of oil pressure. I was consistently seeing about 75 psi and now it is at 65 psi. At idle, the low pressure indicator now flashes and is making about 20psi.

    I was originally chalking it up to warming ambient temperatures but this airplane also ate a wrist pin cap and sent some aluminum through the system a while back. It was addressed but I am wondering if there is a chance that there might still be some lingering shavings causing a partial blockage.

    Any thoughts?

  2. #2

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    How much time on the engine total and how long since bottom end was open? Do you have a screen or oil filter? Is it still making metal? At what RPM are you seeing the high pressures mentioned? DENNY

  3. #3
    stewartb's Avatar
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    Have you cleaned your suction screen?

  4. #4
    RaisedByWolves's Avatar
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    What engine is it?


    Sent from my iPhone using Tapatalk

  5. #5
    skywagon8a's Avatar
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    Remove and clean out the oil pressure relief ball and spring located on the upper right rear side of the crankcase. A spec of carbon getting stuck under the ball can do this.
    N1PA

  6. #6
    akavidflyer's Avatar
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    Quote Originally Posted by skywagon8a View Post
    Remove and clean out the oil pressure relief ball and spring located on the upper right rear side of the crankcase. A spec of carbon getting stuck under the ball can do this.
    mine did the same thing. New spring and ball and its rock steady again.
    Thanks mixer thanked for this post
    Likes TxAgfisher liked this post

  7. #7

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    160hp Lycoming. Last filter was mishandled and thrown away but I’ll be cutting this one soon. I’ll check the pressure relief ball as well - was wondering if that’s where I needed to start or if there was any other place something might be hiding.
    Likes DENNY liked this post

  8. #8

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    The pressure relief ball is a quick and easy thing to check so starting there is a good Ideal. DENNY

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