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'88 Ford 460 Class A on Oshkosh Burns Oil and occasionally emits "white" smoke. It burns about 1 qt every 100+ miles. The performance is acceptable. This started happening all of a sudden not gradually. I change oil every 2000mi and Marvel Oil in the gas and additives to the oil don't help. Any ideas?
I don't think it's a coolant leak Dee. As you know, the first sign of a coolant leak into the crankcase is that white ring of coolant and water suspension on the dipstick. Investigation of the fresh air make-up hose will also show the presence of coolant, not to mention engine misfire due to coolant in a cylinder or cylinders fouling a plug or plugs. The easiest detection is just to sniff the exhaust for that somewhat sweet smell of coolant that's been through a cylinder.
'88 Ford 460 Class A on Oshkosh Burns Oil and occasionally emits "white" smoke. It burns about 1 qt every 100+ miles. The performance is acceptable. This started happening all of a sudden not gradually. I change oil every 2000mi and Marvel Oil in the gas and additives to the oil don't help. Any ideas?
Only four paths for oil into the combustion chambers. 1. Past the rings because the ring(s) is broken,(due to excessive predetonation,(pinging), or has lost tension due to overheating. Ring failure also results in excessive "blowby" into the crankcase.First indication of excessive blowby is oil in the small, fresh air make-up filter inside of the main air filter housing. Also check for this by pulling the PCV valve out of the rear of the right rocker arm cover and see how much "smoke" is coming out of the hole in the cover.2. Failure,(dislodgement) of the oil seperator below the PCV valve hole in the rocker arm cover.Check for this by pulling hose off of PCV valve and check for liquid oil inside of hose, 3.Failure of the intake valve stem seal(s), usually not all of a sudden. 4. A failure of the intake manifold gasket at a point that allows the oil "fog" to be sucked into a cylinder. This usually results in a misfire at idle. First step would be to pull the spark plugs and carefully examine each one as you remove it for apperance. A normal burn will show a slight tan. Post what you find here, by cylinder #, (the cylinder numbers, front to rear are, driver's side 1-3-5-7, curb side 2-4-6-8.
'88 Ford 460 Class A on Oshkosh Burns Oil and occasionally emits "white" smoke. It burns about 1 qt every 100+ miles. The performance is acceptable. This started happening all of a sudden not gradually. I change oil every 2000mi and Marvel Oil in the gas and additives to the oil don't help. Any ideas?
Only four paths for oil into the combustion chambers. 1. Past the rings because the ring(s) is broken,(due to excessive predetonation,(pinging), or has lost tension due to overheating. Ring failure also results in excessive "blowby" into the crankcase.First indication of excessive blowby is oil in the small, fresh air make-up filter inside of the main air filter housing. Also check for this by pulling the PCV valve out of the rear of the right rocker arm cover and see how much "smoke" is coming out of the hole in the cover.2. Failure,(dislodgement) of the oil seperator below the PCV valve hole in the rocker arm cover.Check for this by pulling hose off of PCV valve and check for liquid oil inside of hose, 3.Failure of the intake valve stem seal(s), usually not all of a sudden. 4. A failure of the intake manifold gasket at a point that allows the oil "fog" to be sucked into a cylinder. This usually results in a misfire at idle. First step would be to pull the spark plugs and carefully examine each one as you remove it for apperance. A normal burn will show a slight tan. Post what you find here, by cylinder #, (the cylinder numbers, front to rear are, driver's side 1-3-5-7, curb side 2-4-6-8.
How many miles on the engine? The point earlier about the intake and valve seals are typically the culprits, assuming the mileage isn't severe and the engine hasn't been abused. Valve seals will definitely be a problem with the 460 if the engine has been running hot, 230+. I have a 460 with 150,000 and only uses a quart of oil in about 3,000 miles. I have an engine oil cooler since I had to replace the valve stem seals at 40,000 because of over heating. Long story but the radiator wasn't the correct spec for what was ordered. Valve seal leakage is best detected by coasting down hill and at the bottom hitting the gas and watch for smoke. Also, when you first start, if you see smoke, the seals could be the problem.
White smoke is an indication of a coolant leak. The color white is water that has turned to steam. The oil lose could be found in your radiator if a head gasket has gone bad. From all of the symtoms you are describing, I would suspect a bad head gasket.
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