possible blown HG?

toyotarunner1992 · 11-19-2009, 09:41 PM

ok, i take off my radiator cap and there is all this like brown gunk on the cap and floating around... it looks likie congeiled oil but im not sure. read the blown HG thread and couldnt find anything about oil in the radiator or coolant... or maybe a cracked block?

No smoke from tail pipes at all.
oil is clean no coolant

dont really know.

there is also a very very LARGE vibration when the car hits around 40 mph no matter what gear im in. starts at 40 and vibrates at anything faster.

again confused...

its an 87 N/A so any help would be great.

THANK you

Bill UK · 11-19-2009, 10:26 PM

The first signs of Head Gasket failure on a Supra are the expansion tank overflowing and a gurgerling sound behind the dash at start up. (Combustion gases in the coolant.) Check inside your oil filler cap for any white residue, normally a good sign of coolant leaking into the oil gallery’s, not common with a Supra but worth checking. I would give the engine and rad a good flush out , Remove the drain plug in the block, located on the exhaust manifold side towards the rear. I would also remove the rad and give it a good flush through, fill up with coolant and check again for any gunk.. The Vibration doesn’t sound related to a HG failure unless your not firing on all cylinders due to a major blown head gasket failure in which case your expansion tank would overflow.

MA70-3.0GT · 11-20-2009, 12:42 PM

Just a thought, could the gunk be the result of mixed coolant types?
It's definitely worth following Bill's advice of flushing the system through & refilling either way because if it is oil then it'll start to damage the rubber coolant pipes & there's a few that are a complete pig to get at.

A compression test would probably show if the HG was on it's way out, and if you get on well with a local garage you could ask them to put the exhaust analyser probe into the top of the radiator (although not immersed in the coolant!) to see if there's any combustion gasses getting into the cooling system.

toyotarunner1992 · 11-20-2009, 04:44 PM

ok thanks for the advise. i am going to take out the radiator and flush out my engine of coolant and oil and then see where i am.

i still do not know where the vibrations are coming from.

toyotarunner1992 · 11-20-2009, 11:30 PM

what coolant type does the supra use? i havent gotten my toyota books yet and i wanna put the RIGHT coolant in there if i am going to clean it out completely...

thanks again

cre · 11-21-2009, 01:46 AM

Quote:

Originally Posted by toyotarunner1992

what coolant type does the supra use? i havent gotten my toyota books yet and i wanna put the RIGHT coolant in there if i am going to clean it out completely...

thanks again

Toyota uses a red coolant that you can get from the dealership. It cools better and generally provides superior dielectric insulation. It is more expensive, but you only need a gallon... so it's no biggie. If the coolant system had any other type of coolant in it previously you MUST thoroughly flush the coolant system before returning to the red coolant. Some types of coolants are incompatible and will emulsify (thicken) when mixed.... don't want to add any more sludge to the system.

MA70-3.0GT · 11-21-2009, 04:58 PM

Hope it goes well & the sludge was just mixed coolant. As to the vibration, it might just be a wheel out of balance (although in my experience this tends to be from 55mph to 70mph usually). Could also be a worn engine/gearbox mounting or propshaft bearing...

toyotarunner1992 · 11-21-2009, 11:10 PM

thank you all for the advise. i REALLY hope its mixed coolant sludge too. I am gonna take a look at the prop shaft bearing since it is coming from the WHOLE back of the car. it isnt jsut one wheel. that should be easy enough to replace.

i emptied the resevior tank for the coolant today and it didnt look like it had oil in it just a lot of sludge and debris. so i dont THINK its a HG but we will see. compression test tomorrow as well!

hope all goes well!

MA70-3.0GT · 11-22-2009, 05:05 PM

Best of luck with the comp. test, do you know anyone in the motor trade who could do the "sniff test" with an exhaust gas analyser in the rad top? Either that or a chemical "block test" would also be worth doing if possible...

150, 150, 150, 150, 150, 150... here's hoping...

Oh, and another thing to look out for at the back end is brake disc (or handbrake drum) warpage or sticking. Although if it was this you'd likely feel a pulse through the brake pedal on braking (or the handbrake lever, if applied just enough to slow the car while moving at about 30mph)

toyotarunner1992 · 11-23-2009, 02:32 AM

no the vibration only happens when i am accelerating, and it is really bad. i looked at the cvs, and they seem to be fine no warpage or bending or anything. its starting to get really bad though, like EVERYTHING vibrates no matter what gear or speed... VERY VERY annoying. so i am thinking it is that prop shaft bearing like dieing or somthing... please let me know if you have more thoughts!

i do not actually know anyone with any equipment like you were listing above. sucks.

oh and my exhaust is just kind of hanging there after the first muffler... anyone has stock exhaust they are trying to get rid of let me knoW!

11-19-2009, 09:41 PM	#1
toyotarunner1992 Stock Join Date: Nov 2009 Location: Tucson/Phoenix Posts: 12	possible blown HG? ok, i take off my radiator cap and there is all this like brown gunk on the cap and floating around... it looks likie congeiled oil but im not sure. read the blown HG thread and couldnt find anything about oil in the radiator or coolant... or maybe a cracked block? No smoke from tail pipes at all. oil is clean no coolant dont really know. there is also a very very LARGE vibration when the car hits around 40 mph no matter what gear im in. starts at 40 and vibrates at anything faster. again confused... its an 87 N/A so any help would be great. THANK you

11-20-2009, 12:42 PM	#3
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Just a thought, could the gunk be the result of mixed coolant types? It's definitely worth following Bill's advice of flushing the system through & refilling either way because if it is oil then it'll start to damage the rubber coolant pipes & there's a few that are a complete pig to get at. A compression test would probably show if the HG was on it's way out, and if you get on well with a local garage you could ask them to put the exhaust analyser probe into the top of the radiator (although not immersed in the coolant!) to see if there's any combustion gasses getting into the cooling system. __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

11-21-2009, 04:58 PM	#7
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Hope it goes well & the sludge was just mixed coolant. As to the vibration, it might just be a wheel out of balance (although in my experience this tends to be from 55mph to 70mph usually). Could also be a worn engine/gearbox mounting or propshaft bearing... __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

11-22-2009, 05:05 PM	#9
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Best of luck with the comp. test, do you know anyone in the motor trade who could do the "sniff test" with an exhaust gas analyser in the rad top? Either that or a chemical "block test" would also be worth doing if possible... 150, 150, 150, 150, 150, 150... here's hoping... Oh, and another thing to look out for at the back end is brake disc (or handbrake drum) warpage or sticking. Although if it was this you'd likely feel a pulse through the brake pedal on braking (or the handbrake lever, if applied just enough to slow the car while moving at about 30mph) __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!! Last edited by MA70-3.0GT; 11-22-2009 at 05:08 PM. Reason: brakespiel...

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11-19-2009, 10:26 PM	#2
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	The first signs of Head Gasket failure on a Supra are the expansion tank overflowing and a gurgerling sound behind the dash at start up. (Combustion gases in the coolant.) Check inside your oil filler cap for any white residue, normally a good sign of coolant leaking into the oil gallery’s, not common with a Supra but worth checking. I would give the engine and rad a good flush out , Remove the drain plug in the block, located on the exhaust manifold side towards the rear. I would also remove the rad and give it a good flush through, fill up with coolant and check again for any gunk.. The Vibration doesn’t sound related to a HG failure unless your not firing on all cylinders due to a major blown head gasket failure in which case your expansion tank would overflow.

11-20-2009, 04:44 PM	#4
toyotarunner1992 Stock Join Date: Nov 2009 Location: Tucson/Phoenix Posts: 12	ok thanks for the advise. i am going to take out the radiator and flush out my engine of coolant and oil and then see where i am. i still do not know where the vibrations are coming from.

11-20-2009, 11:30 PM	#5
toyotarunner1992 Stock Join Date: Nov 2009 Location: Tucson/Phoenix Posts: 12	what coolant type does the supra use? i havent gotten my toyota books yet and i wanna put the RIGHT coolant in there if i am going to clean it out completely... thanks again

11-21-2009, 11:10 PM	#8
toyotarunner1992 Stock Join Date: Nov 2009 Location: Tucson/Phoenix Posts: 12	thank you all for the advise. i REALLY hope its mixed coolant sludge too. I am gonna take a look at the prop shaft bearing since it is coming from the WHOLE back of the car. it isnt jsut one wheel. that should be easy enough to replace. i emptied the resevior tank for the coolant today and it didnt look like it had oil in it just a lot of sludge and debris. so i dont THINK its a HG but we will see. compression test tomorrow as well! hope all goes well!

11-23-2009, 02:32 AM	#10
toyotarunner1992 Stock Join Date: Nov 2009 Location: Tucson/Phoenix Posts: 12	no the vibration only happens when i am accelerating, and it is really bad. i looked at the cvs, and they seem to be fine no warpage or bending or anything. its starting to get really bad though, like EVERYTHING vibrates no matter what gear or speed... VERY VERY annoying. so i am thinking it is that prop shaft bearing like dieing or somthing... please let me know if you have more thoughts! i do not actually know anyone with any equipment like you were listing above. sucks. oh and my exhaust is just kind of hanging there after the first muffler... anyone has stock exhaust they are trying to get rid of let me knoW!