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1970 351 Cleveland coolant in crankcase Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting dmac0923 Enthusiast May 11, 2016, 12:54 PM Post #1 of 5 (1435 views) 1970 351 Cleveland coolant in crankcase Sign In 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 __________________________________________________ 2015 Jeep Grand Cherokee 2002 Ford Ranger 2004 Toyota Corolla 1969 Ford Mustang Mach 1 Hammer Time Ultimate Carjunky / Moderator May 11, 2016, 1:18 PM Post #2 of 5 (1433 views) Re: 1970 351 Cleveland coolant in crankcase Sign In If it wasn't being used when it happened, I'd tend to blame the cold and something frozen causing a crack. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. dmac0923 Enthusiast May 11, 2016, 1:29 PM Post #3 of 5 (1428 views) Re: 1970 351 Cleveland coolant in crankcase Sign In any ideas how i can start to trace the source down? __________________________________________________ 2015 Jeep Grand Cherokee 2002 Ford Ranger 2004 Toyota Corolla 1969 Ford Mustang Mach 1 Hammer Time Ultimate Carjunky / Moderator May 11, 2016, 2:00 PM Post #4 of 5 (1426 views) Re: 1970 351 Cleveland coolant in crankcase Sign In Pressure test would be the first step but tear down may be the ultimate method. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. Tom Greenleaf Ultimate Carjunky / Moderator May 11, 2016, 4:24 PM Post #5 of 5 (1418 views) Re: 1970 351 Cleveland coolant in crankcase Sign In 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)   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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