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Car Forum / Ford / Ford Trucks / November 2007Lots of blue smoke at startup and idle
Truck: f450 7.3l diesel 180000 miles. Blows a lot of blueish smoke out, a lot when cold and some at idle (when warm). I just changed the oil. Could an injector be stuck open? What else could be the problem? Thank you Will > Truck: f450 7.3l diesel 180000 miles. > Blows a lot of blueish smoke out, a lot when cold and some at idle [quoted text clipped - 3 lines] > > Will Blue smoke=burning oil Black smoke=unburnt fuel White smoke=water Which on a diesel can mean lots of water in fuel. Blue on start up usually points to valve seals and valve guides. Whitelightning On Nov 12, 1:34 am, "Whitelightning" <white.lightni...@verizon.net> wrote: > <willaimsw...@yahoo.com> wrote in message > > news:1194833317.511106.25450@50g2000hsm.googlegroups.com...> Truck: f450 7.3l diesel 180000 miles. While driving tonight the truck slowed down from 60 to 0 on the highway. I couldn't get it restarted, again lots of smoke. Could it be the turbo? A few times when I tried to start the motor there was lots of knocking, but that could be from fuel problems, etc. > > Blows a lot of blueish smoke out, a lot when cold and some at idle > > (when warm). I just changed the oil. Could an injector be stuck open? [quoted text clipped - 10 lines] > > Whitelightning >> Truck: f450 7.3l diesel 180000 miles. >> Blows a lot of blueish smoke out, a lot when cold and some at idle [quoted text clipped - 12 lines] > > Whitelightning Although it could be the valve guides (particularly the start-up smoke). Smoke from valve seals when running usually isn't a big problem with turbocharged diesels. I'd suspect the turbocharger as the main culprit. Another possibility would be an engine with a lot of sludge. The sludge blocks the drain path from the heads back tot eh oil pan. This leaves a lot of oil in the heads around the vale stems - and encourages leakage into the intake track. If I wanted a decent answer, I'd ask for Jim Warman's advise. He actually works on Ford diesels. Ed > Although it could be the valve guides (particularly the start-up smoke). Smoke from valve seals when running usually isn't a big > problem with turbocharged diesels. I'd suspect the turbocharger as the main culprit. Another possibility would be an engine with a > lot of sludge. The sludge blocks the drain path from the heads back tot eh oil pan. This leaves a lot of oil in the heads around > the vale stems - and encourages leakage into the intake track. I had a '84 Ford Escort with worn rings & guides. Tried to gain additional mileage on the tired engine by adding some "no smoke" oil additive. Problem is it thickened up the oil a little too much & I blew the cam seal right out of the block & set the engine on fire. Had lots of smoke then. > Truck: f450 7.3l diesel 180000 miles. > > Blows a lot of blueish smoke out, a lot when cold and some at idle > (when warm). I just changed the oil. Could an injector be stuck > open? > What else could be the problem? Well since this is a diesel, I'd guess your turbocharger has a leaky oil seal. Did the oil smoke just start when you changed oil? If so, did you change the type or viscosity of the oil? Ed > Truck: f450 7.3l diesel 180000 miles. > What else could be the problem? I don't know for sure, but how about 180,000 miles? >> Truck: f450 7.3l diesel 180000 miles. > >> What else could be the problem? > > I don't know for sure, but how about 180,000 miles? That's nothing on a diesel. Diesel motors usually outlast the body/chassis they're installed in, when properly maintained. My dump truck has a Caterpillar with over 800,000 miles on it. It leaks a little bit of oil, but still doesn't smoke. Spdloader bananna in the tail pipe.. http://www.minibite.com/america/malone.htm |
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