15.25 mm for 3/8"bsp 14.75 mm for 3/8" bspt. If your worried about the drill swarf as said above fill the drill flutes with grease and you will have no dramas, don't forget the swarf from the tap also, grease in the flutes of the tap will work there aswell. Personally I would weld the fitting into the sump.
Sorry mate only just saw this now and for the life of me I cannot find the receipt of what size it was.
I actually got Patrolapart to punch it for me as they had the punch ready to go and do them all the time and are only 15 minutes from my house.
I'm sure if you gave them a call and mentioned you are from here they will help you with the size.
As above, welding or removing the sump and drilling is a better option but I chose to run the gauntlet and it has been fine, 100%.
It was a five second job, they also used grease just in case but if you do not want to take the sump off I would be punching not drilling as the punch splays the metal inwards rather then fragments of metals that may come off using a drill. As always though there is a risk and do so at your own risk of course but it worked fine for me.
I simply put the barb on with the approximate length of hose I needed for the oil drain and capped that off, drove home and installed the turbo in my shed...Happy days!
Yep as above mate 3/8 BSP....Just found my old thread below which mentions it.
http://www.nissanpatrol.com.au/forums/showthread.php?4973-Fitting-a-genuine-Nissan-turbo-to-a-N-A-TD42/page4&highlight=td42+td42t+turbo
Thanks AB, will let you all know how it goes. Might do my own write up about it (could be the longest one in history though at the rate I get stuff done)....
White 1994 GQ Patrol Manual Diesel 4.2
AB (18th January 2014)
3/8 bspt is not 3/8 across, i usually drill a 14mm hole in alloy before tapping it to 3/8 bspt, cheers
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