86.5 coolant leak

Isphius · 11-09-2005, 01:30 AM

I have an 86 1/2 supra with an 88 motor that the previous owner swapped in...it was about 90% as bad as the original motor. anyway....there is coolant leaking from behind the head somewhere. i was reading about a water pipe back there somewhere.....but i was wondering if anyone else has had this problem. so far ive ruled out...broken heater core....hoses...and the head gasket. anyone have any advice?

kewlcoconut · 11-09-2005, 08:10 AM

from behind the head somewhere? hmm... does it only leak when you drive it, then park? or can you see it leaking when you have the car running. i have had multiple coolant leaks. the biggest one i just had the other week was my heater core. you do not want that! expensive part to replace.

mrnickleye · 11-09-2005, 08:12 AM

You'll need a good flashlight and a mirror-on-a-stick to see it, let alone replace the hose. Good luck...

Isphius · 11-09-2005, 09:41 PM

If i fill it, its fine. when it runs, it pumps it all out in about 20 mins. im replacing the whole motor anyway cause iy has a wicked rod knock, probably from the overheating problem (the last owner was pretty...idiotic). But this believs me to think its a pretty big leak....and its above the radiator somewhere and it has to be pressurized to come out. i already disconnected the heater core and it still leaks.

toyota_guru · 11-10-2005, 07:54 PM

Quote:

Originally Posted by Isphius

If i fill it, its fine. when it runs, it pumps it all out in about 20 mins. im replacing the whole motor anyway cause iy has a wicked rod knock, probably from the overheating problem (the last owner was pretty...idiotic). But this believs me to think its a pretty big leak....and its above the radiator somewhere and it has to be pressurized to come out. i already disconnected the heater core and it still leaks.

There is a block off nipple on the back of the head that usually leaks, or it could be the egr cooler, both are culprits to leaking.

Isphius · 11-11-2005, 05:45 AM

Thanks for the help. The headgasket is blown anyway. it started smoking pretty bad today when i took it for a test drive, and it started running like a beotch. im guessing cause it was leaking oil all over the plugs. oh well im rebuilding a different motor for it anyway but i was hoping id be able to drive it while the new motor was underway....but i guess not.

HD Supraman · 11-11-2005, 11:20 PM

On mine it was the by-pass hose between the back of the head and the firewall.
I've gone through three of them in the past year; time for braided steel, I guess.

11-09-2005, 01:30 AM	#1
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	86.5 coolant leak I have an 86 1/2 supra with an 88 motor that the previous owner swapped in...it was about 90% as bad as the original motor. anyway....there is coolant leaking from behind the head somewhere. i was reading about a water pipe back there somewhere.....but i was wondering if anyone else has had this problem. so far ive ruled out...broken heater core....hoses...and the head gasket. anyone have any advice?

11-11-2005, 11:20 PM	#7
HD Supraman Stock Join Date: Nov 2005 Posts: 1	89 Coolant leak On mine it was the by-pass hose between the back of the head and the firewall. I've gone through three of them in the past year; time for braided steel, I guess.

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11-09-2005, 08:10 AM	#2
kewlcoconut 3" Exhaust Join Date: Sep 2005 Location: Vancouver, BC Canada Posts: 157	from behind the head somewhere? hmm... does it only leak when you drive it, then park? or can you see it leaking when you have the car running. i have had multiple coolant leaks. the biggest one i just had the other week was my heater core. you do not want that! expensive part to replace.

11-09-2005, 08:12 AM	#3
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	You'll need a good flashlight and a mirror-on-a-stick to see it, let alone replace the hose. Good luck...

11-09-2005, 09:41 PM	#4
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	If i fill it, its fine. when it runs, it pumps it all out in about 20 mins. im replacing the whole motor anyway cause iy has a wicked rod knock, probably from the overheating problem (the last owner was pretty...idiotic). But this believs me to think its a pretty big leak....and its above the radiator somewhere and it has to be pressurized to come out. i already disconnected the heater core and it still leaks.

11-11-2005, 05:45 AM	#6
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	Thanks for the help. The headgasket is blown anyway. it started smoking pretty bad today when i took it for a test drive, and it started running like a beotch. im guessing cause it was leaking oil all over the plugs. oh well im rebuilding a different motor for it anyway but i was hoping id be able to drive it while the new motor was underway....but i guess not.