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Thread: Grounding oil temp probe

  1. #1

    Grounding oil temp probe

    I have an extension and 90 degree oil filter adapter on my IO-540 and am getting abnormal oil temps. (Too low with a small rise when flying.) I replaced the probe and have the same problem. I'm thinking its a grounding issue.
    What is the best way to establish a ground from the oil filter adapter (or oil temp probe) and the engine? Should I run a wire from an adapter bolt to the engine? But which part of the engine? Thanks.

  2. #2
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Canby, OR
    I would recommend a hose clamp or ring terminal on the probe shaft.
    Shawn McGinnis

    Advanced Flight Systems

  3. #3
    Used a hose clamp on round part of probe and ran wire to bolt holding standby alternator on accessory pad. Works great now! Could not get a ring terminal to work as there is nothing on probe for it to tighten against. Thanks for the suggestion.

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