NPT actually stands for national pipe taper.
https://en.m.wikipedia.org/wiki/National_pipe_thread
Mine isn't tapered so it shouldn't stop like the pressure Barb. So it should go all the way in.
I remember a rotax mechanic and a technical support guy from Lockwood both stating they were tapered.
All I guys here said it was m15 if I remember correctly.
U guys here now more than Lockwood!
2 quick questions
Should I put a copper washer behind it so it doesn't bottom out onto try aluminum?
Should I install the mushroom or only if the pressure relief ball has wear?
Tapered (NPT) threads are just that and never get screwed in all the way or you will split the oil pump housing. 80 in/lbs max.
The other type is not tapered and does go in all the way and yes it gets a crush washer. You can see this in the parts manual under the oil pump section.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
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