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  1. #11

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    +1 on being a sender issue. They get old and tired. They are also effected by low voltage, like at idle. I doubt it is the problem, very very rare to be a problem, but there is a simple spring loaded pressure valve forward of the oil pump.. but I doubt that is the problem.

  2. #12

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    Quote Originally Posted by tomrealest View Post
    At idle one of my Detroits is only showing 3 to 5 lbs oil pressure. Once I increase the rpm's it increases to 45 lbs. Need help finding a 2 cycle Detroit guy in the Boca Raton-Delray Beach area. Most guys will travel. Would appreciate some advice or referrals for a Detroit mechanic on the East Coast of Florida.
    That is perfectly normal for a 2-cycle Detroit once the oil is up to operating temperature.
    Tony Cabral
    Hatteras 42C "BUSTER"
    Hope Town
    Abaco Bahamas
    42' POST / "GHOST MOVE"
    New London Ct

  3. #13

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    My port motor always chimed-in briefly at gear shift RPM drop. Last couple of cruises the bell rings almost all the time at idle after a run. I was due for an oil change, and hoped new 40 Wt. might solve it. No so. The mechanicals say I’ve got 7-8 PSI at idle while cruising at 1800 RPM shows +\- 45 PSI. So I’m thinking that 7 PSI sender has had its day. I’m going to a 5 PSI unit and forget about it.
    Semper Siesta
    Robert Clarkson
    ASLAN, 1983 55C #343
    Charleston, SC

  4. #14

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    Isn't the standard sender 3 psi?
    "The older I get, the faster I was......."

    1979 60C "Ohana" hull# 331

  5. #15

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    My book says 7
    Semper Siesta
    Robert Clarkson
    ASLAN, 1983 55C #343
    Charleston, SC

  6. #16

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    BTW, anyone have the p/n for a 5 and/or 7 psi switch?
    Semper Siesta
    Robert Clarkson
    ASLAN, 1983 55C #343
    Charleston, SC

  7. #17

    Re: Help for Detroit 8V71Tis Low oil pressure at idle

    Quote Originally Posted by racclarkson@gmail.com View Post
    BTW, anyone have the p/n for a 5 and/or 7 psi switch?
    Disregard. Found a 4 psi at Sam's.
    Semper Siesta
    Robert Clarkson
    ASLAN, 1983 55C #343
    Charleston, SC

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