Help tapping an oil pan

[Mk4_30R_Ban]

@KrazyKid

Technically speaking, I think an NPT COULD seal without any tape/paste/sealant. The threads AND shank are tapered on the fittings. The bore and threads on the body your attaching it to aren’t. So the deeper you thread in the fitting, the shank, between the threads, actually can bottom out inside the female body and seal it. Picture taking a funnel and jamming it into a rubber cylinder. same concept. But I can only see that work when the female body you is softer metal than the male fitting your sending in it… that way aslong as the threads hold you can tighten it up and actually displace some material inside the female body and create a flare if you will.

i wasnt saying it is a requirement. if the threads are worn then ya may need it. dont take it as i was saying you have to have it.

the only thing ive ever legally seen used on AN fittings(talking NAVAIR specs) is a graphite type lubricant on AN threads to prevent corrosion between the surfaces. but teflon tape is a huge no-no on AN fittings