Auto Supra Coolant hose pressure and return leak to oil pan and filter area?

rjSupra · 10-25-2010, 07:31 PM

Thanks guys, will get right on that, sounds easy for once. Even finding a lower rad hose seems too much for local suppliers. Seems I have to special order it 2 day in. Also there is very short 5" or so skinny diameter black hose that looks to be some sort of return from the turbo. It mates right into the back side of where the lower rad hose meets the block. EDIT: I think this might be the 16285 Toy part / Gates 18030?? What is this hose and what do I look for for a replacement? Think it's wise to do since it's so easy to reach, and the metal lines it connects looks a little coolant oxides sludgy around it, so I want to do this while it's out. I am fearful of bunging up the water outlet housing even worse than it is by trying tap and die it with a tap. My friend said I could go with:

"You could substitute a 1/4-20 for the M6, but you'd need to find a 1/4
bolt, which is slightly larger (.25 vs. .236), making your mating part
clearance hole situation slightly worse. Also, you'd have different
sizes on the two. Not a huge deal, but not "right".

To do this, you may still have to helicoil it, but you could try it
first without doing so. Take a .201 (#7) drill and drill out the hole
(again, be careful not to poke through...tape on the drill shank at a
safe max usually works). Then tap it 1/4-20 using the procedure I
mentioned prior. Then find a 1/4-20 bolt the right length, and put it
back together. If the threads are not strong enough because of the
prior drilling efforts, you can still helicoil it, maybe even for an M6."

I don't have the right tap for the M6 x 1.5 original bolt, nor does one store, but I do have the 1/4-20 ta on hand. Sound like an ok plan of attack on what's holding up my reassembly?

10-25-2010, 07:31 PM	#39
rjSupra 3" Exhaust Join Date: Sep 2010 Location: NH Posts: 86	Thanks guys, will get right on that, sounds easy for once. Even finding a lower rad hose seems too much for local suppliers. Seems I have to special order it 2 day in. Also there is very short 5" or so skinny diameter black hose that looks to be some sort of return from the turbo. It mates right into the back side of where the lower rad hose meets the block. EDIT: I think this might be the 16285 Toy part / Gates 18030?? What is this hose and what do I look for for a replacement? Think it's wise to do since it's so easy to reach, and the metal lines it connects looks a little coolant oxides sludgy around it, so I want to do this while it's out. I am fearful of bunging up the water outlet housing even worse than it is by trying tap and die it with a tap. My friend said I could go with: "You could substitute a 1/4-20 for the M6, but you'd need to find a 1/4 bolt, which is slightly larger (.25 vs. .236), making your mating part clearance hole situation slightly worse. Also, you'd have different sizes on the two. Not a huge deal, but not "right". To do this, you may still have to helicoil it, but you could try it first without doing so. Take a .201 (#7) drill and drill out the hole (again, be careful not to poke through...tape on the drill shank at a safe max usually works). Then tap it 1/4-20 using the procedure I mentioned prior. Then find a 1/4-20 bolt the right length, and put it back together. If the threads are not strong enough because of the prior drilling efforts, you can still helicoil it, maybe even for an M6." I don't have the right tap for the M6 x 1.5 original bolt, nor does one store, but I do have the 1/4-20 ta on hand. Sound like an ok plan of attack on what's holding up my reassembly? __________________ 88 Supra 7M-GTE Turbo, TEMS, Targa stock Last edited by rjSupra; 10-25-2010 at 07:36 PM.