turbo coolant boiling
11-09-2007, 03:46 PM
#1
1.0 BAR
Thread Starter
Join Date: Sep 2006
Posts: 326
turbo coolant boiling
I've got a watercooled T3 on my 4runner. I smell that sweet smell of coolant after shutting it down.
Pretty sure it's not a HG issue as I've got no water in the oil and my leak down is fine.
What I *think* is happening is that when I shut the truck down, the turbo is still hot.
Water in the turbo boils off, produces 15psi in my cooling system, and that leaks past the cap into the overflow.
The overflow blows a little vapor and that seems to be what I smell...
Shutting down a hot turbo and having the water boil off has to be fairly common.. comments?
Pretty sure it's not a HG issue as I've got no water in the oil and my leak down is fine.
What I *think* is happening is that when I shut the truck down, the turbo is still hot.
Water in the turbo boils off, produces 15psi in my cooling system, and that leaks past the cap into the overflow.
The overflow blows a little vapor and that seems to be what I smell...
Shutting down a hot turbo and having the water boil off has to be fairly common.. comments?
11-09-2007, 09:55 PM
#2
3.0 BAR
Join Date: Feb 2005
Posts: 4,935
Re: turbo coolant boiling
headgasket. Doesnt have to leak coolant into the oil to show signs of a headgasket, if that happens its a really badly blown headgasket. The cylinders are pressurizing the cooling system and its leaking out in the only way it can, through the overflow tank.
11-10-2007, 02:08 AM
#3
!! UNCONFIRMED EMAIL !!
Join Date: Sep 2007
Posts: 1,305
Re: turbo coolant boiling
im not sure of the exact tepm but becuase the water is under pressure in the radiator, somewhere up around 15psi, that the water will not boil untill way past 250 degrees.
we learned this ---- in gradeschool and and i learned to calculate it in college chem, remember how it takes less heat to boil water in denver apposed to deathvalley? called vapor pressure
we learned this ---- in gradeschool and and i learned to calculate it in college chem, remember how it takes less heat to boil water in denver apposed to deathvalley? called vapor pressure
11-10-2007, 05:50 PM
#5
1.0 BAR
Thread Starter
Join Date: Sep 2006
Posts: 326
Re: turbo coolant boiling
Originally Posted by Skaterdudz02
What's your mix on the antifreeze you're using? 50/50?
Guys, I've blown HGs before - and I've got the tools to check. It's not a HG. If you're 100% sure that I'm smoking the pipe, I can pull the water cooling and see if I still have the issue.
Think about it, cool down EGTs are in the 900 degree range, the center section is real close to the turbine. Run it hot, stop the water flow and the water that's in there is going to boil...
No one has ever seen this happen, eh?
11-10-2007, 06:43 PM
#7
1.0 BAR
Join Date: May 2007
Posts: 230
Re: turbo coolant boiling
Originally Posted by dcg9381
50/50
Guys, I've blown HGs before - and I've got the tools to check. It's not a HG. If you're 100% sure that I'm smoking the pipe, I can pull the water cooling and see if I still have the issue.
Think about it, cool down EGTs are in the 900 degree range, the center section is real close to the turbine. Run it hot, stop the water flow and the water that's in there is going to boil...
No one has ever seen this happen, eh?
Guys, I've blown HGs before - and I've got the tools to check. It's not a HG. If you're 100% sure that I'm smoking the pipe, I can pull the water cooling and see if I still have the issue.
Think about it, cool down EGTs are in the 900 degree range, the center section is real close to the turbine. Run it hot, stop the water flow and the water that's in there is going to boil...
No one has ever seen this happen, eh?
Maybe get a coolant temp gauge to monitor how hot it's getting.
I just spoke with my dad on this issue and he's positive it's the radiator cap itself. Too much boost, getting too hot.
Problem solved would be putting a higher pressure radiator cap on to withstand the pressure, but there's a catch.
The cap bleeds off the pressure; I believe my dad said normally most cars are at 15psi or something, I can't remember, so if you put a higher one on, you may run the risk of blowing hoses or something.
Best advice, drop the boost, and run it a little less harder then where you're at.
11-14-2007, 12:24 AM
#9
1.0 BAR
Thread Starter
Join Date: Sep 2006
Posts: 326
Re: turbo coolant boiling
Originally Posted by Skaterdudz02
If you're hitting in the 900 degree mark, you must be pushing that ---- really hard. Are you using a stock radiator fan?
Maybe get a coolant temp gauge to monitor how hot it's getting.
I just spoke with my dad on this issue and he's positive it's the radiator cap itself. Too much boost, getting too hot.
Problem solved would be putting a higher pressure radiator cap on to withstand the pressure, but there's a catch.
The cap bleeds off the pressure; I believe my dad said normally most cars are at 15psi or something, I can't remember, so if you put a higher one on, you may run the risk of blowing hoses or something.
Best advice, drop the boost, and run it a little less harder then where you're at.
Problem solved would be putting a higher pressure radiator cap on to withstand the pressure, but there's a catch.
The cap bleeds off the pressure; I believe my dad said normally most cars are at 15psi or something, I can't remember, so if you put a higher one on, you may run the risk of blowing hoses or something.
Best advice, drop the boost, and run it a little less harder then where you're at.
The cap is new (15psi). Dropping the boost doesn't drop my EGTs under cruise.
Note, if I let the truck idle, I don't have this issue (flowing water). When I shut it down, it starts to boil the water in the turbo.
