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What thread is that on my new oil cooler?

in 912 / 914 Technical Questions 10 hours ago

I recently bought an original Rotax XL oil cooler (part number 886107) for my 912 Vz. Now that I'm trying to source the fittings to attach it to the 1/2 inch hose I wonder what the inside thread connection is? Please refer to the attached image. It's about 14 mm and I was able to turn a metric M14 screw in for a bit only but it is obviously not M14. Strange because I know the outside is M22. Any suggestions?

10867_1_oilcoolerthread.jpg (You do not have access to download this file.)

  • Re: What thread is that on my new oil cooler?

    by » 6 hours ago

    Hi Till,

    SI-PAC-014R1 indicates the oil cooler fitting internal thread is M14×1.5 (ISO metric fine series). The screw/bolt which you used to check the thread is probably M14×2.0 (ISO metric coarse series).

    Conventionally a metric thread without a specific pitch called out can be assumed to be a coarse thread.

    SI-PAC-013 lists all of the fittings available from Rotax to suit their oil cooler and oil tank. It also lists the applicable tightening torque for each fitting type.

    Thank you said by: Till Middelhauve
      
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