>> 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
>>
> 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
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