95 XLT 4WD OHV 107,000 miles.

It's beginning to look like the clicking noise in my engine is the timing chain/tensioner. I also want to change the crankshaft seal while I'm in there (minor seepage).

The Ford Service Manual and Haynes say the engine has to come out. Chilton doesn't say but implies it can be done with the engine in the vehicle.

Has anyone done the chain and tensioner without pulling the engine? Any tips if you have? (e.g. loosen oil pan bolts and engine mounts and hoist engine slightly.)

If the sprockets are worn can they be changed with the engine in?

Does doing it the "easy way" (engine in) wind up being harder than doing it the "hard way" (engine pull)? Does it open you up to other problems? (oil pan leaks etc.)

Any "might as wells" while I'm in there? (water pump for example).

If I have to pull it I will probably go ahead and tear it down to and inspect/replace as necessary. (I was hoping to do that closer to 200,000 miles than 100,000!)

Lots of questions! All opinions welcome. Actual experience greatly appreciated.

Thanks,

Rich