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Thread: Engine runs cold

  1. #1

    Engine runs cold

    How about, "Its a Musketeer and it is winter"? Everybody's Musketeer runs at the bottom of the green in the winter unless they put a plate to block some of the oil cooler. Most of us don't. My A23 with IO346 runs there even in the Texas Summer.
    Willis

    rjf <rjf@p339.com> wrote: Folks,

    My engine (12 hours out of overhaul) runs at the bottom of the green.
    The oil probe has been checked against a known good one. They both
    registered the same. Any clues about cause and solution? My plane goes
    in for overhaul on the 25th. I'd like to have it taken care of then.


    regards,


    RJF

  2. #2

    Engine runs cold

    My Sierra, about 20 Hours after top overhaul, runs at
    185 degrees measured on the JPI 700 which corresponds
    quite well with the ship's gauge at about one needle
    lower than the mid green dot. Outside temp was about
    20 degrees Fahrenheit... at 4K foot ... measured
    yesterday. No blocking of anything for the engine.
    Power setting 23 MP x 2400 RMP - leaned 75 degrees
    rich of peak.


    Regards

    HarryR

  3. #3

    Engine runs cold

    >My engine (12 hours out of overhaul) runs at the bottom of the green.
    >The oil probe has been checked against a known good one. They both
    >registered the same. Any clues about cause and solution? My plane goes in for overhaul on the 25th. I'd like to have it taken care of then.

    Let us not forget that the gauges are old and questionable. Anytime some measurement is called into question, verifying the accuracy of the
    measurement is the first step.

    For OT, I suggest a thermometer like we had in HS Chemistry class that is secured to a small dowel, such that it can be lowered into the sump through the dip stick holder, immediately upon shutdown.

    Once you know your panel mounted gauge is accurate (or not) you can proceed with the necessary steps to correct the real problem.

    What if the panel gauge is reading too cool and you block off the oil
    cooler and elevate your OT to where the panel gauge reads 200? Now you might be cooking your oil and your engine.

    The S-W panel gauge can be tested for accuracy by placing a 28.5 ohm
    resistor in the circuit instead of the OT sender on the accessory
    case. Flip on the master and read the gauge. Should read red line (245).

    If that is accurate the next step is to reverse the process and test the
    sender in hot oil to see if it is 28.5 ohms at 245 degrees F. I recommend
    olive oil in a tin can (smokes less) and an accurate thermometer (chemistry class type).

    Best wishes,

    Bob Steward, A&P IA
    Birmingham, AL

  4. #4
    Like most everybody's, my oil temp gauge always reads low. So at last annual I added digital oil temp to the open channel on my E.I. FP5.

    What I saw in the summer were temps around 170 to 175... maybe a few degrees hotter during climb. Well here in New England the weather is finally starting to turn colder. Two weeks ago outside temps were around 40 when I went tooling around and I never saw the oil temp go higher than about 145. So this past week I covered the oil cooler with aluminum tape.. left no hole. Outside temps were high 30's. Went up to 5,500 and saw 175 on the digital guage.

    I was initially concerned with covering the whole thing, but based on the temps I'm seeing I think I'll leave it.

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