Blown Head Gasket?
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Freshman User
Joined: Jul 2008
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From: Phoenix
Blown Head Gasket?
i was drivin down the highway in my 86 supercab 351W and i lost oil pressure shortly after i heard a ping and black smoke was comin out the pipes and in through the floor and under the hood and there was oil on the intake but not dripping out of the block. it still turns over and sounds ok but will not start, what problem is this?
Cargo Master
Joined: Jan 2004
Posts: 2,512
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From: Cook Forest and Irwin PA
yes, a spun bearing will affect oil pressure, but perhaps not on the gauge, the tap is on a passage after the pump. If the bearing spins and blocks oil flow, your gauge might read great
pedant
Joined: Jan 2008
Posts: 23,576
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From: EXTREME southwest CT
Do you mean to say you lost oil pressure and continued to drive down the highway?
Another thing that could have happened is you could have holed a piston due to detonation.
This would pressurize the crankcase and blow all your oil through the PCV into the intake, until you ran out and the light came on.....
It likely won't start because all the plugs are covered in oil.
Another thing that could have happened is you could have holed a piston due to detonation.
This would pressurize the crankcase and blow all your oil through the PCV into the intake, until you ran out and the light came on.....
It likely won't start because all the plugs are covered in oil.
Posting Guru
Joined: Mar 2007
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OK. Do a compression test on all the cylinders......
and all the rest. You probably have some major issues with this motor. Pull your distibutor cap and see if the rotor is turning. If the dist. shaft snapped that would stop the oil pump and still let the motor turn freely without starting. It wouldn't explain the smoke necessarily, although that could be from gas flooding the cylinders with no spark. That would be the luckiest thing that could have happened. A snapped timing chain is another possibilty, but to have that happen and not have pistons smacking valves all over the place would be a miracle. Let us know what you find out.
and all the rest. You probably have some major issues with this motor. Pull your distibutor cap and see if the rotor is turning. If the dist. shaft snapped that would stop the oil pump and still let the motor turn freely without starting. It wouldn't explain the smoke necessarily, although that could be from gas flooding the cylinders with no spark. That would be the luckiest thing that could have happened. A snapped timing chain is another possibilty, but to have that happen and not have pistons smacking valves all over the place would be a miracle. Let us know what you find out.
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Posting Guru
Joined: Mar 2007
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Do you mean to say you lost oil pressure and continued to drive down the highway?
Another thing that could have happened is you could have holed a piston due to detonation.
This would pressurize the crankcase and blow all your oil through the PCV into the intake, until you ran out and the light came on.....
It likely won't start because all the plugs are covered in oil.
Another thing that could have happened is you could have holed a piston due to detonation.
This would pressurize the crankcase and blow all your oil through the PCV into the intake, until you ran out and the light came on.....
It likely won't start because all the plugs are covered in oil.
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Posting Guru
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[quote=doug1222556;6487566]If the dist. shaft snapped that would stop the oil pump and still let the motor turn freely without starting. quote]
After thinking about this, the distributor shaft and the oil pump driveshaft would both have to snap- a gear failure is more likely. The more I think about it the more sense it makes that there was a failure here, most likely the dist. gear, possibly the cam gear and even less likely the cam snapping at the gear. A distributor gear failure would allow the rest of the valvetrain to remain in sync so the pistons and valves wouldn't get together. It would kill the oil pump and the ignition flooding the cylinders which would belch black smoke and the motor would then turn over but not start. The only thing that it doesn't explain is the oil on the manifold.
After thinking about this, the distributor shaft and the oil pump driveshaft would both have to snap- a gear failure is more likely. The more I think about it the more sense it makes that there was a failure here, most likely the dist. gear, possibly the cam gear and even less likely the cam snapping at the gear. A distributor gear failure would allow the rest of the valvetrain to remain in sync so the pistons and valves wouldn't get together. It would kill the oil pump and the ignition flooding the cylinders which would belch black smoke and the motor would then turn over but not start. The only thing that it doesn't explain is the oil on the manifold.
Senior User
Joined: Jul 2004
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All that oil leaking or blowing on the engine and exhaust (You sure it was coming out of the pipe and not burning off it?), coming through the floor and out from the hood makes me think you maybe had a major oil leak or spraying from somewhere. All oil gone, no oil pressure.
Posting Guru
Joined: Mar 2007
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Q's 86- Where are you? How about answering a couple of questions? Was there oil coming out the tailpipe? How much oil is in the oilpan now? Or the whopper- Have you figured out what happened? There is enough speculation going on around here to raise the price of oil.
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From: Phoenix
sorry my internet has been down.... there wasnt any oil coming out of the pipe. there was oil all over the intake and black smoke was coming out of the pipes but blue smoke from the engine bay into the car. i havent seen the car in a week because it broke down when i was on my way up to college and we left it on the side of the highway till my dad went back with a tow truck and brought it home. he is doin a compression test this weekend and he and a couple neighbors belive its a gasket of somesort and should be somethin easy. we are goin to wait and see what the compression test says and go from there. thanks for the help guys ill let ya know when i find out sometime this weekend what the results come in and what other symptoms we find.
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Blue smoke was oil on the exhaust manifolds. Black smoke out the pipes is rich condition. Couldn't tell from your first post how much oil was on the manifold.Also not clear how fast all of this happened. Weird- can't wait to see what this turns out being. Maybe there was an excessive amount of blow-by in the crankcase, and ArdWrknTrk nailed it. Just have a hard time with the oil covered plugs-seems like there would be oil in the pipes and it would have belched BLUE smoke instead of black. Maybe the timing chain did bust and tear up the cover in the process near the top and the fan and speed of the vehicle kept most of it on the manifolds. Guess we'll just have to wait for the exciting conclusion........
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Same thing happened to my 85 F150 with 351W last year on my way to college. Lucky for you it was relatively close to your home. Happened to me 800 miles away from home so there was no dad coming to pick it up...
Posting Guru
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The exact same thing or did you just break down?