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My 915iS powered gyrocopter external oil cooler thermostat weeps oil at its connection. They are tight and leak at the conical metal-to-metal seal. I have found that using Del fitting seals usually fixes this issue, without having to make new lines. So that is my current plan to fix. This is the first maintenance I have performed on mine, or any other Rotax. As a licensed A&P, I have read SI-915 i-003R2, watched the Rotax video, and feel I have a good understanding.

Since this is being done at the conditional inspection time, an oil change is also planned. My question to the you experts is whether it makes more sense to drain the oil, open/repair the oil seep, then refill with clean oil for the required purging, or to drain and refill with new oil, careful not to bump the prop, then open and repair the seep, followed by the purging process. The latter option may waste more new oil, but it seems that collecting and reusing new oil is commonly done. So no wastage, but more air?

I had planned to attend Rotax training prior to this effort, but you know how plans often go astray. Thanks in advance. 

    

  • Re: Drain, open lines, then purge, or open, purge then drain

    by » 5 months ago


    Rob,

    I believe the Del seals are only for AN style fittings, which should be what is on your aircraft if it was made in the USA, or equipped for USA delivery from another country.  However, now and then I see metric fittings on some Rotax powered aircraft in the USA that come from overseas. So before starting, make sure you have AN fittings. The metric fittings are kind of opposite of the AN fittings.  They have a concave socket shape on the fixed end fitting and a convex dome shape on the hose fitting.  In other words, the hose fitting fits INTO the fitting (socket) on the fixed end.  The shape is different than an AN fitting, it’s more like a dome and the Del seals won’t fit.  


    Regarding the order of things, I don’t think it makes much difference because either way you need to purge the system once complete.  I would tend to drain the oil first and use disconnecting the oil lines as an opportunity to get more of the old oil out.  It might be a good time to clean the oil tank also.  Then when complete, refill the system and purge. 


    Thank you said by: Rob Duncan

  • Re: Drain, open lines, then purge, or open, purge then drain

    by » 5 months ago


    We agree with the information provided by Jeff B in the above post message.

    To perform the oil purging procedure for the Rotax 915, please follow the steps outlined in the following Service Instructions:

    • SI-915 i-003

    You can find a video demonstrating the purging of the lubrication system at the following link: Rotax Oil Purging Procedure Video.


    Thank you said by: Rob Duncan

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