One problem related to diesel engine has been reported for the 2003 Ford F-550. The most recently reported issues are listed below.
I have experienced numerous engine failures, of which I have the receipts, on my f500 Ford with the 6. 0 diesel engine, at a cost to me of over $7,000. At the time of the failures, the engine was only out of warranty for a short period of time. Because a diesel should last for a relatively long period of time and should not have these types of problems, I asked Ford to cover the bill. In short, Ford would not give me the time of day or admit to anything. I am very concerned as I don' t make the kind of money it takes to continually invest in an engine that should still run fine. I have also discussed this with others that own the same engine and have found that the type of problems that I've had are quite common with the 6. 0 engine. I have all the receipts and expect Ford to take responsibility for what is clearly a poorly built engine. I'm also having trouble with the air conditioner for years and have been unable to find the problem. I await your reply and can send you a copy of the bills and my correspondence with Ford.