Will you be able to easily tell if it had BHG.

[gobutai]

I need the "7MGTE Experts" expertise / opinion on this one. Would a Supra have a blown head gasket if it had a coolant and oil to specs, driven for 20-25 miles (part of the drive - driven hard), and the car did not smoke at all? The local mechanics' opinion say that it did not have a blown head gasket, but I want to see what the experts have to say about this.

I have daily driven this particular car for 3 months with no smoking what so ever, and during the test drive before it was sold, no smoking either - would one be able to tell if it had a blown head gasket.

 

[Suprapowaz!(2)]

Are you the guy that bought/traded your AE86 for some guys MKIII supra? Then drove the shit out of it and blew the headgasket, tried to blame the previous owner, and denied him the rest of your parts you promised him for that trade?

Can a 7mgte blow a head gasket in a instance... yes. Run perfect one second, and overheat and puff steam outta the exhaust the next second... yes. I've done it, twice. Both time was on stock toyota HG's and stock head bolts at stock torque. Please stop playing the blame game and just fix your car.

 

[gobutai]

Hey Suprapowaz - actually the other way around. I was the previous owner of the aforementioned Supra and a new AE86 owner. I know that the 7mgte was healthy and was my daily driver for 3 months. It was an excellent car until the new "recently." I just want to see you guys' expertise / opinions because the new owner is still blaming me to date. What do you think?

 

[kotu100]

im a perfect example for this
my supras been running fine for months now i drove it at least 10k miles on its current turbo setup.
i cranked the boost up to 20psi since i just got maft pro and it blew the HG on the 2nd pull thru 3rd gear. INSTANTLY. blew massive amts of white smoke and i turned the engine off.
replaced it last week and so far its fine.


so YES he easily could have blown the HG even if it was perfectly fine before.

 

[IBoughtASupra]

What gasket were you running Kotu?

 

[gobutai]

thanks to everyone's reply; it is greatly appreciated...

 

[suprastupid]

http://www.supramania.com/forums/showthread.php?121555-Check-out-my-bhg-PICS Here is the headgasket in question. I'm sure you could blow a headgasket in a instant but did it look like this?? Alan said the boost controller was set at 8 psi. Ummm also if I blew the HG on the test drive why did I continue with the trade especially when gobutai did not have any of the spare parts he said he would give me.

 

[airhead04]

This will get locked quick.....

Anywho, if it was on stock torque then that is the answer. Stock torque is 56 ft lbs when it SHOULD be 72 to 80. So if you ran it hard during the test drive on a head that wasnt properly tightened then it blew the hg.....

 

[hvyman]

I say if you traded and it blew on the guy you traded it to and then that guy should fix it. Its pretty well known what kind of problem these cars have. shouldnt cost more than maybe 300 max to simply pull head resurface/pressure test and slap a new oem hg on.

 

[gobutai]

To SM,

This thread was not intended to start any arguements or fights. I just would like to know facts about these engines so that I, new members and possibly guests may learn something from this. I never intended to scam or have intentions to scam anyone, and that's why I have started this thread - to get the facts. Thanks to everyone that has replied thus far and their expertise.

Sincerely,
gobutai

 

[ae86ma70]

This will get locked quick.....

Anywho, if it was on stock torque then that is the answer. Stock torque is 56 ft lbs when it SHOULD be 72 to 80. So if you ran it hard during the test drive on a head that wasnt properly tightened then it blew the hg.....

I wish I knew someone who'd do it for $300... Book calls for an insane amount of labor on this. I don't have it handy, but the labor rate for a motor in "good" condition was like 8 hours. Eleven if "rough". I believe stock HG to be fine when torqued to 75lbs or so. Do you not resurface the block also when doing a HG replacement? I suppose since the block is less prone to warpage, and also since we're not talking MLS or stopper type it's maybe not so necessary...

Also, in my experience, and this IS pertinent to the thread... most people with the 7M BHG issue have driven their broken cars for a while before they knew that there was a problem. Or, they knew there was a problem, but didn't know it was a BHG. One day I flushed the coolant and it was fine. Two days later it started billowing white smoke. That's when I parked it, but apparently not before rod knock set in. When we tore the motor down, all the rod bearings were badly scored and the headgasket was unrecognizable. So, in my opinion, my motor had been running alright with a BHG long before it became a glycolholic. Or perhaps a lot of damage was done in a very short period of time. Mine bled chocolate milk though; the coolant was not green, nor the oil black.

BTW, why have a boost controller (or WG actuator controller) that is set at 8psi? Isn't the stock boost somewhere around 7.5psi?

 

[hvyman]

I did it for 60 once. I had the hg and only payed for machine work.

 

[ae86ma70]

"Once" is all I'm planning on having to do it. My engine now has all ARP hardware and a standard HKS MLS gasket. I'll probably melt pistons before I blow a HG, and if that's the case I'll have to think about a 2JZ.

Someone said it at the beginning. Every car is different. I can't believe that my problem occurred overnight, but my gasket looked worse than the one in question. Not sure if I have any pictures. My feeling was always that I purchased a car with a JDM motor that had already blown it's headgasket. Almost the same situation as this one, come to think of it.

To recap: The original owner (we'll call him previous owner #1) purchased the car form another fellow (previous owner #2) who claimed that he had just dropped in a 1000 mile JDM 7MGTE (true story). Previous owner #1 also claimed that it had ARP bolts and MHG. Previous owner #2 apparently passed that information on to his prospective buyers, namely the original poster of this thread.

How many people would be more inclined to push a car on a test drive if they were told that it had ARP hardware and MHG?

 

[grimreaper]

Stop your bitching, fix the car and move on. There are quite a few things you could have done to verify the HG condition and type. You should never take a buyer for face value. Do your own testing and make sure your satisfied with it BEFORE handing over the cash.

It takes a split second to breach a HG. Some blow completely, some leak and go on for years...

 

[airhead04]

Stop your bitching, fix the car and move on. There are quite a few things you could have done to verify the HG condition and type. You should never take a buyer for face value. Do your own testing and make sure your satisfied with it BEFORE handing over the cash.

It takes a split second to breach a HG. Some blow completely, some leak and go on for years...

x2

THIS IS STILL OPEN???!!!

 

[hvyman]

"Once" is all I'm planning on having to do it.

How many people would be more inclined to push a car on a test drive if they were told that it had ARP hardware and MHG?

Actually it wasn't planned and was my DD.
If you can do it yourself it can be done easily for under 300.

I still wouldnt push a car on a test drive
A. its still not my car
B. if something breaks Your inclined to fix it.

Fix the car and be done with it. It does not take 3k to fix a hg.