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912 ULS Oil Leak

in 912 / 914 Technical Questions 9 years ago

  • Re: 912 ULS Oil Leak

    by » 9 years ago

    I hesitate to mention this but are you sure you are not over filling your oil tank? I went through a similar witch hunt when I first started changing my own oil. On my REMOS the oil will over flow when the engine is hot and the air flow around the engine will make oil appear in all kinds of strange places on the engine. At one point I was convinced the leak was where the valve rod guide tubes were pressed into the block. Just sayin.
      
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  • Re: 912 ULS Oil Leak

    by » 9 years ago

    Thanks Ernest but no it is not due to overfilling the oil tank.

    Oil is leaking from the base of the cylinder stud, traveling along its length and leaking at the cylinder head/cylinder junction. This has been confirmed by teardown.

    Ron
      
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  • Re: 912 ULS Oil Leak

    by » 9 years ago

    Reinstalled #3 cylinder with Loctite 598 on the stud threads that were leaking. Poor weather today, did three 20 minute ground runs with no leaks found. Will fly as soon as weather permits and give results.

    Thanks all,
    Ron
      
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  • Re: 912 ULS Oil Leak

    by » 9 years ago

    Hi Ron,

    598 has a tack setup time of 30 min. with a full cure time of 24 hrs.
    Did you wait a day before running the engine?

    Loctite 598
    This black silicone gasket maker forms a high-quality gasket that seals the space between matched parts to prevent leakage of automotive fluids and gases. It meets manufacturers' specifications for original equipment.
    Features:
    Seals joined parts in automotive systems - prevents leakage of antifreeze, air, oil and transmission fluid
    Meets manufacturers' warranty requirements
    Resists oil better than other silicone gasket makers
    Won't interfere with sensors
    Won't corrode
    Resists vibration
    Made in the USA


    Specs:
    Quantity: 2.7-fl oz tube (80 mL)
    Tack-free cure (time required to dry past tacky state): 30 minutes
    Full cure (time required to reach full set): 24 hours
    Temperature range (endurance limits of the gasket maker): -75 F to 625 F
    Ideal gap-filling capacity (gap sizes in which gasket maker performs best): 0.001" to 0.125"
    Maximum gap-filling capacity (maximum gap size between joined parts): 0.240"


    Applications: Valve covers, oil pans, timing covers, water pumps and thermostat housings

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: 912 ULS Oil Leak

    by » 9 years ago

    Actually waited 3 days between 598 application and first start. Company from out of town forced a work stoppage.

    Ron
      
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