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antifreeze in oil
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Author:  Junior [ Wed May 14, 2014 6:52 pm ]
Post subject:  antifreeze in oil
its not a slant but i figured the ideas would be the same regardless of what the motor is. head gasket went quite a while ago and the coolant wasnt getting into the oil. my brother in law kept driving it and at some time it let loose and now i have a milkshake in my motor. ive always heard antifreeze eats bearings. i dont know if that is true or not. its $300 for just the gaskets to reseal the top of the motor. is it worth it to just change the oil and the head gaskets? three hundred bucks is more then i care to gamble with.
Author:  MoreDoorVal [ Fri May 16, 2014 12:56 pm ]
Post subject: 
My buddy blew 3 seperate headgaskets in his Toyota Supra before finally listening to me and getting ARP studs and a Cometic gasket and torquing the studs 20 pounds more than the factory reccomends. 150k+ and still running with no issues, and he blew the gasket pretty good the last time, looked like a cloud factory :shock:
Author:  DadTruck [ Fri May 16, 2014 1:23 pm ]
Post subject: 
the bearing material for the mains, rods and cam bearing is basically aluminum and tin plated over a steel shell.. antifreeze is compatable with all of those alloys.

The reason that "antifreeze eats bearings" is antifreeze is a poor substitute for engine oil when it comes to lubrication.

Dilute the normal oil film with antifreeze and bearing wear rates skyrocket.

So it depends upon how much the oil was diluted, how long the motor ran that way and the loads the engine bearing were subject to.
Author:  Joshie225 [ Fri May 16, 2014 2:51 pm ]
Post subject: 
What engine are you dealing with?
Author:  Tim Keith [ Fri May 16, 2014 3:10 pm ]
Post subject: 
Quote:
My buddy blew 3 seperate headgaskets in his Toyota Supra before finally listening to me and getting ARP studs and a Cometic gasket and torquing the studs 20 pounds more than the factory reccomends. 150k+ and still running with no issues, and he blew the gasket pretty good the last time, looked like a cloud factory :shock:
Those 7MGE Supras are disappearing because of that. The 2JZ is more robust in that regard. Not many of the 7MGE got to 150K miles. I've never had that problem with a slant six.
Author:  Junior [ Fri May 16, 2014 4:51 pm ]
Post subject: 
Quote:
the bearing material for the mains, rods and cam bearing is basically aluminum and tin plated over a steel shell.. antifreeze is compatable with all of those alloys.

The reason that "antifreeze eats bearings" is antifreeze is a poor substitute for engine oil when it comes to lubrication.

Dilute the normal oil film with antifreeze and bearing wear rates skyrocket.

So it depends upon how much the oil was diluted, how long the motor ran that way and the loads the engine bearing were subject to.
thats kinda what i figured. its a pretty good mix so its pretty bad. worse then others i have seen.
Author:  Junior [ Fri May 16, 2014 4:52 pm ]
Post subject: 
Quote:
What engine are you dealing with?
im sorry to say its a ford 4.6 in a 98 f150.
Author:  Tim Keith [ Fri May 16, 2014 10:05 pm ]
Post subject: 
Just me, but I don't think I'd want to repair a 15+ year old Ford 4.6. If it was me I'd look for a good used motor. I do not like to work with overhead cam v8s, especially in a truck. I prefer the GM 5.3 as it has push rods.

You did not mention that it was running hot, but it could also be at risk of hydro lock if water is in the exhaust.
Author:  Junior [ Fri May 16, 2014 10:37 pm ]
Post subject: 
still runs, at least until i took it apart. was planning on doing head gaskets and once i go the valve cover off realized it was mud. its not condensation its a milkshake. uses coolant, as long as there is some in there it doesnt over heat.
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