what can cause coolant pressure build up?
#1
what can cause coolant pressure build up?
Hey guys, new to the site, mostly just browse to get answers but i need some help on this one.
REcently my father in law and I pulled a 3.o out of my 89 pu and put it into a 91 4runner. didnt do any real engine disassembly as we didnt want to get into that much work. Got everything put back in and barring a few minor leaks that can be expected from the swap with a 210000 engine, after about 5 days i got to work and noticed the lower radiator hose was completely off the radiator. naturally, it overheated and i put more coolant in, Could the thermostat be the problem? its and aftermarket radiator so maybe that? any input would be greatly appreciated thanks
REcently my father in law and I pulled a 3.o out of my 89 pu and put it into a 91 4runner. didnt do any real engine disassembly as we didnt want to get into that much work. Got everything put back in and barring a few minor leaks that can be expected from the swap with a 210000 engine, after about 5 days i got to work and noticed the lower radiator hose was completely off the radiator. naturally, it overheated and i put more coolant in, Could the thermostat be the problem? its and aftermarket radiator so maybe that? any input would be greatly appreciated thanks
#3
Registered User
Join Date: Dec 2002
Location: Idaho
Posts: 4,655
Likes: 0
Received 0 Likes
on
0 Posts
A normal cooling system operates under pressure. So it would take overheating first to blow a hose off of radiator. My guess is its the wrong hose or wasnt tightned in the swap...
#4
Registered User
Cooling systems normally operate with 10 or 12 pounds of pressure on them. That's nowhere near enough to blow a hose off unless it was already loose. Also, the radiator cap has a pressure relief feature on it to keep this sort of thing from happening.
Make sure your clamps are tight.
Make sure your clamps are tight.
#7
ouch, that could have been one of the last things i was looking to hear. i will replace the thermostat and tighten all the clamps and see if that does the trick. if not, looks like i might be taking it somewhere. any way I can tell if the headgasket is blown on my own? didn't know if there were any signs to look for or what to look at. thanks guys
Trending Topics
#8
Contributing Member
ouch, that could have been one of the last things i was looking to hear. i will replace the thermostat and tighten all the clamps and see if that does the trick. if not, looks like i might be taking it somewhere. any way I can tell if the headgasket is blown on my own? didn't know if there were any signs to look for or what to look at. thanks guys
A compression test may tell you too.
#12
Registered User
you're not gunna get enough pressure out of the stock cap to blow off a hose. If the pressure goes up its released (spring mechanism in the cap). You're sure you got the bottom hose back on right, and properly clamped after you swapped the engine over?
#13
Did some investigating, and read my haynes troubleshooting. It said the drivebelt being loose could cause the engine to overheat. I looked and the power steering belt was not tight at all, maybe an overlook im not sure. Is that connected to the drivebelt? Figured that could be the cause bc i have never had any problems with the thermostat before now.
#14
Contributing Member
Did some investigating, and read my haynes troubleshooting. It said the drivebelt being loose could cause the engine to overheat. I looked and the power steering belt was not tight at all, maybe an overlook im not sure. Is that connected to the drivebelt? Figured that could be the cause bc i have never had any problems with the thermostat before now.
#15
Registered User
Join Date: Dec 2002
Location: Idaho
Posts: 4,655
Likes: 0
Received 0 Likes
on
0 Posts
Those are all drive belts... the P/S one, on a 22RE anyways, is the same one as the water pump... not sure on 3.slow. It causes it to overheat since the waterpump isnt working well... But my guess is you overheated from the hose falling off, no coolant= hot motor..
#16
Contributing Member
It's different on the 3VZ, the water pump is not driven off a drive belt, what the fan comes off of does look like a water pump though (some call it a fake water pump), but if you look at from the back side you'll see it just a bearing in a housing. IIRC the timing belt drives the water pump. But if the fanbelt was too loose it could cause the fan to slip on the belt and spin slower, but I think it would make a lot of noise if that was the case.
Last edited by mt_goat; 11-17-2006 at 05:59 AM.
Thread
Thread Starter
Forum
Replies
Last Post
the1998sr5
95.5-2004 Tacomas & 96-2002 4Runners
15
07-14-2020 08:35 PM
itzmywife's
95.5-2004 Tacomas & 96-2002 4Runners
2
07-25-2015 04:55 PM
the1998sr5
95.5-2004 Tacomas & 96-2002 4Runners
6
07-16-2015 06:20 AM