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1970 351 Cleveland coolant in crankcase
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dmac0923
Enthusiast
May 11, 2016, 12:54 PM
Post #1 of 5
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1970 351 Cleveland coolant in crankcase
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i have a 1969 mustang that has a 1970 351 Cleveland motor. The car has been sitting about 2 years (kids lol). The engine ran fine when last parked.
Went to get the car up and running for this summer....today i pulled the oil pan drain plug and saw antifreeze coming out with the oil.
Clevelands use a dry intake manifold. So now im thinking its probably a blown head gasket or a cracked block. Its been quite a few years since ive torn into this motor, im just trying to think of any other places that a seal/gasket could fail allowing coolant to seep in.
thanks in advance
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
May 11, 2016, 1:18 PM
Post #2 of 5
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Re: 1970 351 Cleveland coolant in crankcase
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If it wasn't being used when it happened, I'd tend to blame the cold and something frozen causing a crack.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dmac0923
Enthusiast
May 11, 2016, 1:29 PM
Post #3 of 5
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Re: 1970 351 Cleveland coolant in crankcase
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any ideas how i can start to trace the source down?
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
May 11, 2016, 2:00 PM
Post #4 of 5
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Re: 1970 351 Cleveland coolant in crankcase
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Pressure test would be the first step but tear down may be the ultimate method.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
May 11, 2016, 4:24 PM
Post #5 of 5
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Re: 1970 351 Cleveland coolant in crankcase
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Yes - pressure test and pull spark plugs that should NEVER see coolant. Hard engine to plain blow head gaskets but freezing sure will.
Real trivia. If a mix of Ethylene/Glycol was used and you can test it to at least around 15+Fahenheit that level of mix freezes below that but doesn't expand and break things.
Also know that "freeze plugs" are not to protect it rather called "core plugs" used to blow sand out of the casting when made nothing to do with real freezing and expansion any which way. One or more could pop crooked and still wreck the engine. Gaskets, water jackets out or into cylinders the block would be done with. I've seen some hack brazing externally but that isn't it as it wouldn't be in the oil - bummer!
Outside chance timing cover gaskets or a bolt into block thru water pump and cover just a slight maybe??
Tom
(This post was edited by Tom Greenleaf on May 11, 2016, 4:32 PM)
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