Originally Posted by Radial GT

Originally Posted by eage8

I just did this with the engine in the car, and it seems to have went well... I'll update the thread if I kill my water pump or turbo somehow (not sure how the coolant circulates in the turbo).



a few things of note:
- when tapping NPT you shouldn't tap until the whole tap goes in, because the tap is tappered, you'll just start widening the threads. I read on the internet that a decent way to do it is tap till about 6-7 threads are showing on your tap.

- I used a small magnet to get all the filings out of the engine. It seems to have worked really well, cast iron is pretty magnetic I stuck the magnet down the hole a few times over the course of drilling and tapping and would pull out about an inch of magnatized shavings each time. I was surprised the magnet worked that well.

- I also just used a hammer to get the nipple out, it was pretty easy, it came out much easier than I thought it would.

Originally Posted by Snaple07

What size NPT fitting/plug are you using for the rear iron? Did you have to drill the hole bigger and then tap or did you just remove the coolant nipple and then tapped the hole right after. I don't want to drill the hole bigger but if needed I will do so...I currently have 1/4" to 6 AN fittings that I want to use as a coolant feed for my turbo.