Originally Posted by mcbest
Hi, I have a 2001 Lincoln Navigator which has only 54k miles on it. Because of the rising gas price it is mostly garaged. However, I was trying to start the vehicle and it won't turn on. So I tried to jump start the engine with my Ford Windstar, and had to push in to the gas on Navigator while trying to start. The engine did not come on and heard a loud rattling noise from the engine. Looked around and found the bottom, right above the oil pan, on the engine body has a large crack and pieces of cast iron broken and fell on the ground, including some engine oil on the garage floor. I was shocked and don't know the cause of this incident. Now the vehicle is stalled and need to be fixed. Does anyone have ideas of what might have happened, and what is involved to repair this truck? Thanks in advance for the help.
Well if you saw a chunk of the block broken off then you're in for a big bill. To start, you need a short block. With out seeing the motor or taking it apart, the only thing I can think of happening is possibly valve timing jumped and the pistons hit the valves. Usually it will not force a connecting rod through the block, just bend the valves. Another thing that comes to mind is neglected oil changes. If the changes are done too long after the recommended mileage interval this could lead to sludge building up in the oil passages and starving the bearings for oil. If an oil passage for a connecting rod bearing was blocked, the bearing would wear prematurely, spin the bearing, you would start to hear a knocking noise from the engine. If left long enough it would eventually throw the rod like what you have now. Rental cars often are neglected oil change wise. Even if you bought it used and were religious about the oil changes, there is still damage done from when it was a rental. Well, whatever happened, you're in for an expensive repair bill. You could look for a wrecked low mileage motor from a salvage yard. The labor cost would still be there but not as much labor as buying a short block, heads and assembling it. A long block will be slightly cheaper labor wise as well.