
Originally Posted by
isuzurover
The factory hole is around 16 mm, but even 10 mm would be fine. Bush65 has posted a pic of the hole on a 4BD1T before.
Mine wouldn't be any bigger than 12.5mm as that's the biggest plain shank drill that will fit in my chuck.
The diameter of the drain on my turbo is probably only 10mm, and fed via a 1.6mm restrictor without any drainage issues, so I also agree that practically 10mm would be plenty big enough.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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