North American Turbocoupe Organization



Oil drain thread size
John B Offline
Member
#1
I’ve searched and can’t find the answer; what’s the thread size for the oil drain line going into the fitting on the engine block? I’m installing an aftermarket turbo with a custom drain line. My plan is to run a line off the turbo into a new hose connection that fits into the stock fitting but I don’t know the stock thread size. Thanks!
88 Turbo Coupe: Front mount intercooler, MGW short throw shifter, full coilover conversion, tubular control arms front and rear, svo front brakes, vacuum assist brake swap, manual steering swap, GT35R turbo with external gate, pimpx ecu, 60lb injectors, 3 core aluminum radiator, corbeau fixed back seats, and the list goes on.
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MortifydPenguin Offline
Junior Member
#2
I know the threads on the block itself are 3/4 NPT. i want to say they fitting is 1/2 but i cant remember. when i upgraded my line i just used a -12an to 3/4NPT Connector on the end of my hose, and got rid of the fitting. you can also replace the fitting with a 3/4 to whatever size line you want to run. see the link below.

http://www.jegs.com/i/Aeroquip/023/FBM2448/10002/-1
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John B Offline
Member
#3
MortifydPenguin Wrote:I know the threads on the block itself are 3/4 NPT. i want to say they fitting is 1/2 but i cant remember. when i upgraded my line i just used a -12an to 3/4NPT Connector on the end of my hose, and got rid of the fitting. you can also replace the fitting with a 3/4 to whatever size line you want to run. see the link below.

http://www.jegs.com/i/Aeroquip/023/FBM2448/10002/-1

Perfect; thank you!
88 Turbo Coupe: Front mount intercooler, MGW short throw shifter, full coilover conversion, tubular control arms front and rear, svo front brakes, vacuum assist brake swap, manual steering swap, GT35R turbo with external gate, pimpx ecu, 60lb injectors, 3 core aluminum radiator, corbeau fixed back seats, and the list goes on.
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