MicahO
11-27-2004, 06:50 AM
So I've got two sets of winter wheels - the Dunlops on the 330, and the F250 4x4. This problem concerns the F250, a 1990 5.0 with a five speed.
Driving along yesterday, I felt a slight (I stress slight!) hitch in power, check the rearview, and I've got TONS, absolute billowing clouds, of white smoke POURING out the tailpipe. I immediately pull over and check things out.
It's nasty acrid stuff, not anti-freeze, which I'm only sort of happy about. I turn around and try to idle home without tripping any DHS Air Quality sensors. At home (about 2 miles of driving) I note a few things:
1) I've got oil dribbling out the TAILPIPE. That's how much oil is going into the compression chambers.
2) The truck really didn't experience much loss of power, and only pinged once on the drive home - not bad considering how much fouling must be going on?
3) Coolant looks okay, not low, not brackish
4) Didn't check the oil for water or level yet
5) Changed the oil and filter last weekend
6) When I shut the motor down, I listened to oil draining back down into the pan for a good 60 seconds or so - MUCH more than usual, and loud.
Restarting about 30 minutes later, the truck again started right up and seemed pretty normal, but for the James-Bondian smokescreen out the butt end. I let it run for about 25 seconds thinking it might subside before my ecologically minded better half made me shut it down.
My diagnosis is a blockage in the oil drainback from one head that caused oil to pool up top and finally went into the cylinders. It could be far worse? Maybe destroyed a bunch of valve guides on the way? I'm guessing this will be more expensive than the two 90-cent diodes I needed to fix the 22HP motor on my tractor..... :(
Email or PM's prolly best to avoid cluttering the board with FoundOnRoadDead traffic, but some of the most broadly experienced mechanics I know are usually around here.... Thanks all!
Driving along yesterday, I felt a slight (I stress slight!) hitch in power, check the rearview, and I've got TONS, absolute billowing clouds, of white smoke POURING out the tailpipe. I immediately pull over and check things out.
It's nasty acrid stuff, not anti-freeze, which I'm only sort of happy about. I turn around and try to idle home without tripping any DHS Air Quality sensors. At home (about 2 miles of driving) I note a few things:
1) I've got oil dribbling out the TAILPIPE. That's how much oil is going into the compression chambers.
2) The truck really didn't experience much loss of power, and only pinged once on the drive home - not bad considering how much fouling must be going on?
3) Coolant looks okay, not low, not brackish
4) Didn't check the oil for water or level yet
5) Changed the oil and filter last weekend
6) When I shut the motor down, I listened to oil draining back down into the pan for a good 60 seconds or so - MUCH more than usual, and loud.
Restarting about 30 minutes later, the truck again started right up and seemed pretty normal, but for the James-Bondian smokescreen out the butt end. I let it run for about 25 seconds thinking it might subside before my ecologically minded better half made me shut it down.
My diagnosis is a blockage in the oil drainback from one head that caused oil to pool up top and finally went into the cylinders. It could be far worse? Maybe destroyed a bunch of valve guides on the way? I'm guessing this will be more expensive than the two 90-cent diodes I needed to fix the 22HP motor on my tractor..... :(
Email or PM's prolly best to avoid cluttering the board with FoundOnRoadDead traffic, but some of the most broadly experienced mechanics I know are usually around here.... Thanks all!