4.9 I-6 Steam Engine???
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4.9 I-6 Steam Engine???
My son has a 1994 F150 4X4 with a 4.9 I6 engine/auto. The engine has 160K miles.
We noticed the engine is blowing milky oil into the his air filter. So we changed his PCV valve and grommet to achieve a tighter seal. No improvements. I pulled his oil breather while the engine was idling and noticed tremendous amount of steam coming out (also under his dipstick). The dipstick shows yellowish/white milky substance. He is NOT losing antifreeze but it does appears he is losing oil. Lately he noticed steam is blowing into the cab under defrost mode. Does this engine inhale that much condensation?? Or does he have a bigger problem we missing??
We noticed the engine is blowing milky oil into the his air filter. So we changed his PCV valve and grommet to achieve a tighter seal. No improvements. I pulled his oil breather while the engine was idling and noticed tremendous amount of steam coming out (also under his dipstick). The dipstick shows yellowish/white milky substance. He is NOT losing antifreeze but it does appears he is losing oil. Lately he noticed steam is blowing into the cab under defrost mode. Does this engine inhale that much condensation?? Or does he have a bigger problem we missing??
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Check your radiator fluid for oil. Does it spit out Oil from the exhast pipe or has white or blueish smoke? Are your plugs fowled? Does it act like it is gustless? might need a valve job.
"Milky oil" what do you mean?
Rick Z.
"Milky oil" what do you mean?
Rick Z.
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What i mean by 'Milky oil' is the oil color is like yellowish/white.
He is not losing any antifreeze. His reservoir stays full. It is your typical green coolant. We did note minor oil residue blowing out the pipe. We will be taking out the plugs tomorrow to do a compression test. If the bet is on 'blown head gasket', are these 4.9 heads prone to warpage or cracking??
He is not losing any antifreeze. His reservoir stays full. It is your typical green coolant. We did note minor oil residue blowing out the pipe. We will be taking out the plugs tomorrow to do a compression test. If the bet is on 'blown head gasket', are these 4.9 heads prone to warpage or cracking??
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From: Gray, TN
I just rebuilt the 300 in my '90 f150 because the cam bearings were worn out and it had no oil pressure. The owner of the machine shop (the best around) said the 300 head is so long that it is prone to warping. Mine was warped and it didn't even show any symptoms. (maybe they warp once the head bolts are loosened?) If you take it apart, have the intake and exhaust manifold gasket surfaces checked too. Both of my exhaust manifolds were badly warped. Most likely your intake manifold will have some of the mounting tabs broken off too. They can be TIG welded back on. My current 300 used to run like crap because of vacuum leaks between the head and intake.
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From: Auburn, NH
I once had a truck that wasn't used for about a year--only started and moved around the yard once in a while---when I went to finally put it on the road the breather and dipstick had the "milky" gunk in it--I thought sure I had a bad head gasket---but---I drove the truck for a couple of days and made sure it got to operating temp every time---the gunk went away and the truck ran till I sold it (upgraded to beast 4x4)about a year later--still going strong...
Gary
Gary
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