86.5 coolant leak

[toyota_guru]

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]

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]

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.

[mrnickleye]

Dear mr toyota guru, there is no coolant associated with the EGR Cooler, so no coolant can leak from the EGR Cooler. Thank you for giving me this opportunity to enter this thread, again.

[toyota_guru]

Originally Posted by mrnickleye

Dear mr toyota guru, there is no coolant associated with the EGR Cooler, so no coolant can leak from the EGR Cooler. Thank you for giving me this opportunity to enter this thread, again.

yes there is, look in the manual under cylinder head, look at the picture, on the back it says EGR Cooler. Go to www.supra.co.nz/87tsrm/Engine/en37.htm.

Do some research on the subject before you make a comment on it.

[ddmcse]

coolant doesn't flow through the EGR cooler
exhaust gases flow through the EGR cooler " Exhaust Gas Recirculation"

it's not research ... it's experience

[toyota_guru]

Originally Posted by ddmcse

coolant doesn't flow through the EGR cooler
exhaust gases flow through the EGR cooler " Exhaust Gas Recirculation"

it's not research ... it's experience

what do you think cools the exhaust gases, coolant from the head ( thus the term "cooler") I've replace dozens of these because of coolant leaks. it is a heat exchanger type system, the gases flow thru the back of the head which is surrounded by coolant to cool the gases b4 entering the intake to cut down on nitrous emisions. Its the big plug under the cover and the coolant nipple on top that leak. Once the plug starts leaking, it gets bad real quick. take one off the back of the head and you'll see how it works. most ppl never change this gasket or reseal the plug when doing a HG job, only to have it leak at a later time causing more problems. I've even seen the plug leak and coolant get into the intake causing major problems, one time it actually hydro locked the motor the leak was so bad. Thats from 15 years of actual toyota dealership experience.