Coolant Leak

zcoolboard · 11-04-2006, 10:46 PM

Ok so i have a coolant leak on my 88 supra. It is dripping down the transmission from the back of the engine i guess. the other day it was sputtering coolant up behind the head. i checked the hose that goes to the heater and the hose that goes from the head to the block and they seem fine.

i was wondering what part of the back of the head could be leaking. could it be any of the things in the picture?

p.s. the pictures are from an extra head i have, not the one i have on the car....obviously, haha

zcoolboard · 11-05-2006, 09:31 PM

anybody have an idea?

mrnickleye · 11-05-2006, 11:48 PM

If it were mine.....
I would try to clean the area as best I could, to help see.
Then......
I would use a mirror and strong flashlight to see if its leaking at that fitting, or the hoses at the clamps, etc.

I suppose you'd need to get it hot to build up some coolant pressure, if you don't have a (access to a) pressure tester.

ddmcse · 11-06-2006, 04:38 PM

you will probably find cracks on the hose that is connected directly behind the head but you won't be able to see them without the mirror like mrnickleye suggests
i'd plan on replacing it i don't know if your is a turbo but on the exhaust side of the block there is a rubber cap that could be leaking , it's located just below and just behind the turbo
. it's near the tranny but i don't think it would leak onto the tranny . just another thing to check . i'd say it's a cracked hose up top and behind

Isphius · 11-06-2006, 04:49 PM

Yup, that cap leaked on mine. And those behind the head hoses leak all the time and are rather hard to get off. I just cut mine and then pried the clamp off the top of the fitting instead of the old fashion way of unscrewing it lol. But i wouldnt suggest doing that cause you can break the fitting off that way.

jfunez · 11-08-2006, 04:30 AM

I think I got the answer....if its not that hose on the outlet...its the egr cooler cover gasket...that square cover on the back of the head...

If its a JDM engine without an egr. then there will be no cover but instead a coolant plug...check with a mirror and a light just as mr nickel eye sugests...

Tazman3653 · 03-29-2009, 11:33 PM

that square egr cover on the back of the head is not a coolant passage, no coolant should be in it at any time. it is a crossover port for the egr valve to send exhaust gas from one side of the head to the other.

Bill UK · 03-30-2009, 06:54 PM

Quote:

Originally Posted by Tazman3653

that square egr cover on the back of the head is not a coolant passage, no coolant should be in it at any time. it is a crossover port for the egr valve to send exhaust gas from one side of the head to the other.

Tazman 3653 is correct, most likely the union leaking or the hose connecting to it though. Check this out Link

11-04-2006, 10:46 PM	#1
zcoolboard Stock Join Date: Nov 2006 Location: SLO Posts: 2	Coolant Leak Ok so i have a coolant leak on my 88 supra. It is dripping down the transmission from the back of the engine i guess. the other day it was sputtering coolant up behind the head. i checked the hose that goes to the heater and the hose that goes from the head to the block and they seem fine. i was wondering what part of the back of the head could be leaking. could it be any of the things in the picture? p.s. the pictures are from an extra head i have, not the one i have on the car....obviously, haha

11-05-2006, 11:48 PM	#3
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	If it were mine..... I would try to clean the area as best I could, to help see. Then...... I would use a mirror and strong flashlight to see if its leaking at that fitting, or the hoses at the clamps, etc. I suppose you'd need to get it hot to build up some coolant pressure, if you don't have a (access to a) pressure tester. __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

11-06-2006, 04:38 PM	#4
ddmcse 500whp yet? Join Date: Jun 2005 Location: CT U.S.A. Posts: 966	you will probably find cracks on the hose that is connected directly behind the head but you won't be able to see them without the mirror like mrnickleye suggests i'd plan on replacing it i don't know if your is a turbo but on the exhaust side of the block there is a rubber cap that could be leaking , it's located just below and just behind the turbo . it's near the tranny but i don't think it would leak onto the tranny . just another thing to check . i'd say it's a cracked hose up top and behind __________________ 300+ RW HP Dyno run, jdm,mod turbo,3"exh,electfan,greddyboost Blown HeadGasket info My Supra KiXGaS

11-06-2006, 04:49 PM	#5
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	Yup, that cap leaked on mine. And those behind the head hoses leak all the time and are rather hard to get off. I just cut mine and then pried the clamp off the top of the fitting instead of the old fashion way of unscrewing it lol. But i wouldnt suggest doing that cause you can break the fitting off that way. __________________ Yay the supra assistant is gone!!! WEEE!!

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11-05-2006, 09:31 PM	#2
zcoolboard Stock Join Date: Nov 2006 Location: SLO Posts: 2	anybody have an idea?

11-08-2006, 04:30 AM	#6
jfunez 12psi boost Join Date: Oct 2005 Location: georgia,usa Posts: 338	I think I got the answer....if its not that hose on the outlet...its the egr cooler cover gasket...that square cover on the back of the head... If its a JDM engine without an egr. then there will be no cover but instead a coolant plug...check with a mirror and a light just as mr nickel eye sugests...

03-29-2009, 11:33 PM	#7
Tazman3653 Stock Join Date: Mar 2009 Location: Harrisburg Posts: 2	that square egr cover on the back of the head is not a coolant passage, no coolant should be in it at any time. it is a crossover port for the egr valve to send exhaust gas from one side of the head to the other.