ducky Posted April 16 Report Share Posted April 16 Hey all. I was planning to get a Fumoto valve before my next oil change, so I started checking what the drain plug thread is for my truck. It's a 76 with the L20B. Everything I see is pointing to a M16.4-1.33?!? What is that even? Quote Link to comment
ducky Posted April 16 Author Report Share Posted April 16 I answered my own question. It's PF-3/8, as Fumoto themselves tell me. Apparently, PF is Japanese Industrial Standard parallel pipe thread, or I guess straight pipe thread. Looks like it's just the same as British Standard Pipe Thread (BSPT, or more accurately BSPP of the parallel kind). Super weird. Pipe_Thread_size_chart.pdf Quote Link to comment
Crashtd420 Posted April 17 Report Share Posted April 17 (edited) 13 hours ago, ducky said: I answered my own question. It's PF-3/8, as Fumoto themselves tell me. Apparently, PF is Japanese Industrial Standard parallel pipe thread, or I guess straight pipe thread. Looks like it's just the same as British Standard Pipe Thread (BSPT, or more accurately BSPP of the parallel kind). Super weird. Pipe_Thread_size_chart.pdf 197.25 kB · 0 downloads I know I bought a drain plug for my L16 and I'm 99% sure it was the m16.4x1.33.... I remember it being wierd.... Is there a way to compare the threads to pf-3/8? Edited April 17 by Crashtd420 Quote Link to comment
Crashtd420 Posted April 17 Report Share Posted April 17 Pitch looks the same but the pf-3/8 says the outside diameter is m16.66 vs m16.4? Might be worth it to send them an email.... Quote Link to comment
Crashtd420 Posted April 17 Report Share Posted April 17 1 minute ago, Crashtd420 said: Pitch looks the same but the pf-3/8 says the outside diameter is m16.66 vs m16.4? Might be worth it to send them an email.... In reality it's only .010 bigger so it should be fine.... probably just a slightly tighter tolerance.... Quote Link to comment
ducky Posted April 17 Author Report Share Posted April 17 I ended up ordering it yesterday, so when it shows up, I'll do the oil change and see. I expect it'll be fine. Just super weird size. 1 Quote Link to comment
Crashtd420 Posted April 17 Report Share Posted April 17 54 minutes ago, ducky said: I ended up ordering it yesterday, so when it shows up, I'll do the oil change and see. I expect it'll be fine. Just super weird size. Definitely a wierd size but I think you'll be ok as well..... Quote Link to comment
Stoffregen Motorsports Posted April 18 Report Share Posted April 18 Japanese engines used British Standard in their pipe fittings decades after they went to metric on all other fasteners. I thought the drain plug thread was in fact metric, but I would not be the least bit surprised if it were BSP. Quote Link to comment
ducky Posted April 18 Author Report Share Posted April 18 Does me ould hart good to see the gurus even learning new stuff Quote Link to comment
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