I have a 2006 durango with the 4.7. Last month i went to change oil and the drain bolt nut broke loose. Got the bolt/nut out and drained. Finally got it patched up and put oil back in today. (have had other issues to deal with) No leaks. Tried to start and it cranked a few turns and clunk. I can turn the engine back by hand but it stops at the same point when going clockwise. Did it rust inside without having oil in that amount of time? Is it toast? Any suggestions would be appreciated.

 

Exactly how did you "Patch" it up? I hope you mean you put a new drain bolt back in. Sitting for a month without oil should not cause it to rust enough to lock motor up unless you left the engine open to the elements. Sounds to me like you have something within the block that is hanging up on the internals. Is the new oil plug too long and the crank is hitting it? What exactly was the process here and was any part left exposed? (sitting with no drain plug, no oil pan, etc) You may need to remove the pan and check the bottom end for obstructions. Obstructions could also be in the top end in the valves. Also, if it was locked up due to rust, you probably would not be able to turn it back by hand.

 

​​​​​​I used a gear puller to pull the bolt out. Then brazed a plate with a threaded nut to the outside of the pan. It sat on ramps hood down but with the bolt out and drained for about a month.

 

​​​​​​I used a gear puller to pull the bolt out. Then brazed a plate with a threaded nut to the outside of the pan. It sat on ramps hood down but with the bolt out and drained for about a month. Its been in the 20s to 30s here. Not sure if temp would factor into anything or not. Planning to pull the Plugs next weekend to see if it is hydrolocked