My situation: bought a F150 about 6 months ago because it had very low miles on a rebuild. After the last freeze on a short drive the temp peeked all the way then came back down to normal. The next day, hard to start running rough. As it warmed up it smoothed out. Filled with 50/50 antifreeze, checked oil no evidence of water. The next day hard to start and billowing white smoke. Bought some bars leak and drove it for 100 miles. It stopped smoking no loss of fluid seemed fine. The next day started it up and it made a very loud clacking scraping sound. My dellima is I need a truck for my businness (boat sales and electrical contractor) and things have been so slow I am broke. I need to know what I can do to fix this mess. IE sell it at a loss, replace the motor or repair.