Blown Head Gasket Symptoms!

[Bullz_EyE]

My cars tail pipe looks like it's a steam engine. lol, I'm replacing my MHG with a composite one tomorrow.

[Dejvid1785]

I don't have any smoke out of the exhaust or milky oil, but i am losing coolant!! Could that still be thermostat or something else? My temp gauge never stays still it sits up top showing that its over heating but the car isn't over heating and is driveable and suddenly it jumps back down, if anybody knows answer me. Thanx!

[lethalwithasupra]

yea i did that too Bullz_EyE - crimped the head gasket putting it on. $100 and 3 days for a new one. ordered it friday, weekend was agony

[dcrusupra]

I have the problem with the temp gauge, but luckily no problems. While im driving it shoots back and forth. Its either cold or overheating or where it should be. Most of the time it says its really hot. But its still good and driveable. So its just a malfunction with the temp gauge. Not much of a nuisance so i dont worry about it. My gas gauge is like this too. I dont pay attention to the needle but when that little orange light comes on, its definitely time to get gas. Goodluck and hope its not the BHG.

[Dejvid1785]

Can anybody tell me how to test that to see if it really is the HG, is there an easy way to test it out?

[TONY!]

Originally Posted by Dejvid1785

Can anybody tell me how to test that to see if it really is the HG, is there an easy way to test it out?

From
http://www.toyota-supra.info/forums/...27&postcount=3

Originally Posted by TONY!

...In this leaking...do you see that your overflow is full after driving when it gets hot?
Do you lose coolant from that area? A very cheap way to see if you are losing coolant from that area is to put a container (soda bottle) after the overflow dump tube. If the overflow dump tube spits out coolant in the bottle...well, that would indicate that combustion gasses are forcing the coolant out of the system. That would mean you have a BHG in that case.
A cheap test. I learned that trick from Duane (upgradedsupra) so he gets merit for that idea....

Also, the guy that put that Cygnus site up, has some awesome write ups!
http://www.cygnusx1.net/supra/techtips.html

And within that, there is a good write up on BHG's.
http://www.cygnusx1.net/supra/techtip/bhgfaq.html

[Dejvid1785]

Thanx for the help guys, i will find out tomorrow what the deal is. I have a whole day ahead of me. I will let yall know how it turned out.

[gabit]

I think the most common early head gasket problem is from the combustion chamber to a water passage. Think of it this way, the combustion pressures are far greater and hotter than either the oil/water pressures/temps while the engine is running...remove the radiator cap while the car is running, and see if there are any bubbles in the coolant... if "yes" ,increase the rpm, and see if they get worse...if you don't have water in the oil, you can probably seal it with any of the "solutions" they sell for fixing this type of gasket failure before the combustion gasses erode the gasket to an oil passage.

[nelly26]

hi when i got my first supra my head gasket had gone my symptoms was rusty water around reserve bottle all so no heating and then i noticed that coolant level dropped i took to toyota and did emissions test from radiator and discovered there was emission coming out of it and also if you oil in coolant or coolant in oil {milky} it has gone as well

[stevanom]

Looks like you have air in the cooling system. MA's are very difficult to get the air out of the cooling system after you worked on them.

An air lock can cause overheating, while in fact the coolant gets out through the expansian container. (not sure that is the right word)

Might help to press the tubes intensely several times when the car is hot (keep heater system open) to press out locked air bubbles.