Before you check the tensioner, pull the valve cover and check the plastic/rubber chain guide in the cover. If you're lucky, it's hard and is the source of your noise. It should be soft and pliable. I forget what a new one costs, but I think it's under $10. When the cover is off you can also see if the chain is stretched by checking that the sprocket "v's" line up with the marks on the cam bushings at TDC. If the marks line up, the tensioner is still doing its job. If they don't line up, then you need a new chain(most likely) or the tensioner is shot. The Bentley manual covers all this in detail and I think that the Townsend imports technical documents may cover it.
Replacing the tensioner is not hard to do. to get the A/C compressor out of the way, you take off the A/C and alternator belts, and flop the alternator away from the engine to get access to the compressor mount bolts. There are two allen bolts on the top and a 12mm bolt at the bottom. You do not have to take the 12 mm out...just loosen it as the compressor mount is slotted at the bottom for easy removal. Then lift the compressor up and rest it on the top of the engine with the hoses attached.
Then you can take out the tensioner and see if its broken (probably not). If so put a new one in (see Bentley manual for details). The hardest part of the job is putting the belts back on.
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