Did he Screw up His engine

[supraguy31]

Well, I just built an Engine for a friend of mine about 2 weeks ago. He gave me a call sunday night saything that he has alot of steam coming from under the Hood, I Asked where was it coming from and he said its coming from the back part of the motor. I asked have you driven the car anymore since you noticed this, He said that he was on the road right now driving the car, When the temps start to Climb, he turns the car off and coastes for a little and then starts it back up. (10 Miles), He drove it over to my house and I go outside and its streaming its ever living ass off. I pop the hood and I look behind the motor and the small 90 Degree hose that connects to the tube that goes around the motor under the head and to the back of the head split in half.

Well, We went to toyota and Bought the Small hose ($17.00) and went back to my place and put it on. We fill the radiator up and start the car to make sure its not leaking, After about 3 minutes of Idle, I noticed that there is a small brown foam like stuff coming out of the radiator but not to the point where its coming out, (Kinda just sitting there on top of the water in the Neck) Im wondering since he Drove the car for that Distance and it steaming like that (Assuming no water) what damage would he might have done? It started up fine and Idles fine, its just the small amount of brown colored foam that worries me.

Thanks All
Robert

 

[Cycoclown]

i did the same thing to mine, my problem was that the thermostat didnt open and caused the coolant line to pop off.

if he hasnt drivin it since or overheated the engine he should be fine.

as soon as i saw steam from my hood i pushed my car a good 2 miles home.

but brown foam? idk what that could be. id flush the coolant.

 

[supraguy31]

I did notice that some of the Steam came out of his Radiator cap as there was alot of White looking powder looking stuff on the rim right under the cap. Other than the small amount of foam, we wipped it off and it seemed ok from that point. Just hoping that he didnt do anything Driving the car that Distance.

 

[figgie]

you said he drove it until the needle started to overheat. The problem is that the hose in the back of the ehad that feeds the heater core is the highest point in the cooling system.

What that means is that he might have been pulling over when the needle got hot but more than likely, the sensor was reading air temp and not water temp meaning that the head was even hottern than that. I would leak down test and do a HG test on the coolant system. More than likely the head is warped and it also probably took out the HG.

 

[supraguy31]

you said he drove it until the needle started to overheat. The problem is that the hose in the back of the ehad that feeds the heater core is the highest point in the cooling system.

What that means is that he might have been pulling over when the needle got hot but more than likely, the sensor was reading air temp and not water temp meaning that the head was even hottern than that. I would leak down test and do a HG test on the coolant system. More than likely the head is warped and it also probably took out the HG.

Thats what I was thinking when he told me what was going on. Im like even if your gauge isnt reading hot doesnt mean that your engine isnt baking at this point. I dont think they ever made a temp sending unit to read stream instead of water.

Im hoping that he didnt screw up his motor, He has about 500 miles on it right now. Im not going to be doing another Head gasket job on this car, Ive had it long enough and I was glad to see it go. Runs great though.

Side note..... this is the small hose on the Passenger side, not the Drivers side. Its the small 90 Degree hose the comes off of that huge bolt that screws into the back of the head and goes down the that water line that runs up under the head and goes to the front of the motor.

Robert

 

[Supracentral]

You really need to pull the head anyway and check it for straightness and cracks. That kind of overheating can warp/crack an aluminum head pretty easily.

It may have annealed the aluminum (softened the head) as well. The head could be a boat anchor.

 

[figgie]

You really need to pull the head anyway and check it for straightness and cracks. That kind of overheating can warp/crack an aluminum head pretty easily.

It may have annealed the aluminum (softened the head) as well. The head could be a boat anchor.

have to agree with SC.

If that head is annealed due to temp. It is worthless except perhaps as aluminum scrap.

 

[supraguy31]

Well, this isnt a good Sign!!!!!

He called me today saying that he is starting to hear a knocking sound when he is between 1500-2000 rpms. After talking with him about the Issue with the Hose, He did tell me that the temps got up to 3/4 and one time it got up to the red before he shut it off.

Any Recommendations.

 

[Getsideways86.5]

okay, from everything you have given me to go on. it sounds like the motor is shot.. driving the car while its over heating is the dumbest thing he could have done.. chances are he blew the hg and now since hes been driving it with a bhg he prolly has a rod knock.. is he throwing a code? use a steathascope on the bottom end and see if you can hear the noise down there. if not try the head, valve spring could have broken.. what did you do to the car in the first place?

 

[92TealSupra]

You could have easily distorted the head, or even the HG itself. The next step I would take would be to tear into the engine and see the damage.

 

[Supracentral]

Well, this isnt a good Sign!!!!!

He called me today saying that he is starting to hear a knocking sound when he is between 1500-2000 rpms. After talking with him about the Issue with the Hose, He did tell me that the temps got up to 3/4 and one time it got up to the red before he shut it off.

Any Recommendations.

He has either cracked the head or warped the head.

Regardless, this caused coolant to contaminate the oil. As I've posted in another thread:

Many tests have shown that as little as 0.04% (400 PPM) water in lubricating oil can cut the fatigue life of bearings by as much as 48%.

Moisture is generally referred to as a chemical contaminant when suspended in lubricating oils. Its destructive effects in bearing applications can reach or exceed that of particle contamination, depending on various conditions.

Water may cling to metal surfaces or even form a thin film around solid contaminants such as silica particles. But by far the most damage is done when 'etching' occurs.

Water etching is a common type of corrosion occurring on bearing surfaces and their raceways. This corrosion is caused primarily by the generation of hydrogen sulfide and sulfuric acid from water-induced lubricant degradation. Yes, you read that right water (and anti-freeze) when mixed with oil and heated inside an engine combine to form acid. This eats away the soft surfaces of your bearings in no time.

(Ever notice that a Supra with a BHG for any length of time will have rust in the coolant? - Guess what - the coolant has become acidic by mixing with the exhaust gasses that are getting into the water jacket!)

Remember your bearings are never supposed to "touch" anything but oil. The bearings ride on a very thin layer of oil. Once there is some etching, the oil pressure drops (since the etching has provided the oil with a place to go other than where it is supposed to be) and eventually the bearing touches the rotating surface. After that it's all over.

Regardless of what you think at this point, the motor is toast, pull it and start over.

Have the head tested for cracks and straightness. Pull the motor apart, check the rotating assembly and see how much damage he's done. At least one rod may be shot. The crank too depending on how much he's driving/running it with the knock going on. Hot tank the block, start a new rebuild.

 

[supraguy31]

Well, he just pulled up in the car, Checked the oil and it looks somewhat ok... Pulled the Oil cap off and what do I see is while crap all over the inside of the cap. Went ahead and pulled the Radiator cap off and I see oil Particles floating around and his overflo bottle is brown as Shit. Stuck my finger down into the radiator water and its got a completely oily film.

He is upset that he did it but he is going to get another engine instead of rebuilding this one. He doesnt have the time for it to be sitting waiting for everything to be completed.

 

[Supracentral]

Well, he just pulled up in the car, Checked the oil and it looks somewhat ok... Pulled the Oil cap off and what do I see is while crap all over the inside of the cap. Went ahead and pulled the Radiator cap off and I see oil Particles floating around and his overflo bottle is brown as Shit. Stuck my finger down into the radiator water and its got a completely oily film.

Remember, as little as 400 PPM is enough. If you're seeing it, you've got thousands or tens of thousands of PMM.

He is upset that he did it but he is going to get another engine instead of rebuilding this one. He doesnt have the time for it to be sitting waiting for everything to be completed.

And if he's a knucklehead about it in the future, it will happen again.

If your car is leaking coolant/oil/gas STOP DRIVING. That's not hard to understand. Write it on a piece of paper and stick it to his steering wheel.

 

[supraguy31]

Yeah, So I probably have tons of 7MGTE parts to get rid of. He has a 60-1 CT on it and he is changing over to a SP61GT that is sitting in the garage right now. alot of stuff that is extra now so let me here it if you need parts.