Depends on what kind of vehicle it is. On most you have to drop the oil pan, pull the water pump, pull the valve covers and sometimes the heads, but not always, and pull the timing chain cover to get to it. You will probally have to pull the distributor out as well. There should be timing marks on the timing pullies that need to be lined up when you change the chain. Your best bet for this job is to get a good manual and read up on it, then follow it step by step.
A loose timing chain can only be repaired by replacing the timing chain . A loose timing belt means the belt is worn out or the tensioner is worn out. Replace worn parts.
You cannot adjust the tensioner. It is automatic, and takes out the slack of a stretching/aging cam chain. Once the tensioner has fully extended, the only fix is to replace the chain and the part of the tensioner the chain rides on if it is worn.
That ACTUALLY means that you probably didn't need to replace the timing chain in the first place. If you did it yourself, did you replace the tensioning rails? Check to see if they're worn. Note that one of the tensioning rails connects to a piston actuated tensioner assembly; if it isn't functioning properly the timing chain tension will not be maintained. Also, if the engine has low oil pressure, the tensioner will not function properly and you may end up with a loose timing chain.
If the timing chain on your Lincoln LS is worn out then it should be replaced. A worn out timing chain can jump a link, or more, and the engine will ultimately not be able to run. Normally the timing chain will last the life of the engine.
Yes, you could. Is it a good idea? Probably not. If the tensioner is worn so must be the chain.
Worn belt or belt that has stretched to the point the tensioner cannot keep the proper tension. The tensioner can also be defective. Replace the belt and the tensioner.
You did not list Make, Model, Year, or Engine Size. So all I can tell you is that the vast majority of vehicles with a timing chain have a self tensioner that keeps the tension tight. If the chain it loose or noisy then it is more than likely worn out or the tensioner needs replacing or both.
When it's worn out!
No, not unless it is worn out. Timing chains normally last the life of the engine and are replaced when the engine is rebuilt.
This repair is best left to a professional. Why are you changing the timing chain? This is not required unless the chain is loose or worn. It should last the life of the engine.
Normally a timing chain will last the life of the engine. Replace it only if it becomes noisy or you have performance issues related to a worn chain as in jumping time.
Your timing chain may be worn to the point it is jumping a tooth and thus changing the timing. If you can hear the chain that is a good sign it is worn. I would inspect the timing chain.