Has anyone ever had a oil filter seal not seal real good on engine block?

I put my new filter on and clean around the block and put the new filter on but it still leaks. it is a re-built engine but i wouldnt think that would have anything to do with it. any suggestions on what i can do?Has anyone ever had a oil filter seal not seal real good on engine block?
first make sure you have the right filter, make sure the old gasket from the old filter came off with it, and lastly put some clean oil on the new gasket this sometimes helps with the new filter sealing correctlyHas anyone ever had a oil filter seal not seal real good on engine block?
SteveoX has it right. The wrong filter, or if the old gasket had stuck to the block, can both cause leaks. You don't specify what engine it is, but some engines have an adapter on the block that the filter screws into. It is possible that the adapter is actually what is leaking. You will need to clean it real good and see where the oil is actually coming from.
Before replacing the oil filter, put a little oil on your finger and rub it on the rubber seal. Tighten the filter snuggly (hand tight) if it still leaks give it a quarter turn witrh a filter wrench.
If the old oil gasket was left on the engine when you installed the new oil filter, you'd know right away. It would pretty much leak a lot of oil as soon as you started the car (and I mean a lot of oil, know this from experience unfortunately).





There is a gasket right behind the oil filter fixture and sometimes this is where the leak occurs.





Also, since you have a rebuilt, be sure the block is not cracked.





Get a good light and one of those telescoping mirrors to see what's really going on.
First try removing the filter and take the gasket/seal out. Clean any oil off of it then clean the area where the gasket goes and make sure there is no oil there. Put the seal back in. This is a common problem where oil or an air pocket gets under the seal and it won't work properly. Make sure the seal is pressed in all the way. If this does not work then you could have a defective filter.
some engines have a seal or gasket behind the oil filter adapter. Might not be the filter.