Re: M11 oil pan - More stripped threads Reply #25 – May 14, 2021, 10:06:54 pm NPT Size Tap Drill Size (in.). (Decimal) (in.)3/4 - 14 tap 29/32 tap drill size. (0.906)1.0 - 11•1/2 Tap. 1•9/64 tap drill size (1.141)1•1/4 - 11•1/2 tap 1•31/64 tap drill size. (1.484)1•1/2 - 11•1/2 tap. 1•23/32 tap drill size. (1.719)Seems that should be correct. I personally would do what Wyatt did. Make sense to me just to cut to the straight threads and buy corresponding quick drain. Much smaller hole in pan = other repairs available.tapped the drain hole to 1 1/8 by 12tpi and obtained perfect threads, so installed the 1 1/8 Fumoto valve. Scott Quote Selected 2 Likes
Re: M11 oil pan - More stripped threads Reply #26 – May 15, 2021, 04:47:39 am I pulled. My pan off to do mine. I then decided to get a new pan and,put a remote drain valve on it. I did finish the old pan and still have it tapped with the Cummins fix. Quote Selected 2 Likes
Topic: M11 oil pan - More stripped threads