I can say with 100% certainty that one of the tensioners (cam chain) is on the side of the block and simply unscrews. Be careful not to slip timing...speaking from experience with an inop sky in my back yard...
That's part of the timing chain tensioner.
Holy Cow, ROBO!
So, if I understand ya correctly, ya hafta remove the P/S - A/C belt AND the engine front cover IF ya want to replace the TC Tensioner?? WOW! And here I thought that it was like a LARGE spark plug that just screwed in from the top? Obviously NOT!!
Forgive my LNF ignorance once again, ROBO, but I have colored and underlined where it appears that yer are talkin bout TWO SEPARATE TENSIONERS. I know that there are 2 chains (Cams + Balance) BUT do they both have individual TENSIONERS?
Thank ya so much, Mr. Wizzard!
I'm attaching the above link to a timing chain set since it has all the parts I'm going to talk about. I'm attaching the picture too but that doesn't always work so...
If you look at the attached picture, you'll see the two chains...the upper one is your true timing chain, the other one is the one that drives your water pump and balance shafts.
Just below the sprocket pictured with the upper chain is the tensioner Rockchops mentions. This part pushes against the long curved piece it is pointing to and what I was referencing as a tensioner before. You'll see this piece is silver with a beige "pad" on it. The silver part is aluminum but the "pad" is a form of plastic (don't know if it's delrin, nylon, etc...). It's this plastic "pad" that wears and eventually will disappear completely. When this is gone, you have metal chain on aluminum arm and that's bad. LOL When people talk about the tensioner wearing out or being damaged by running the chain over-tightened due to allowing the water pump sprocket to slip during a water pump changeout, this is the piece they're talking about.
You also will note a number of other "beige guides" in the picture on the lower chain. There is one, the very bottom one, that only has one hole in it right next to the large lowermost sprocket. This is the other tensioner. It can wear out too. There is another guide in this setup that is not pictured and it goes on the timing chain (upper chain) between the two big sprockets. This is also silver with a beige pad like that chain's tensioner and it too can wear and cause metal on metal contact when worn out.
Everything you see in that picture except for the one tensioner piece Rockchops mentioned is only accessible via the front engine cover.