Dang, I miss the google search here.
Anyway, you want to set the 1-4 T line (T as Top Dead Center) against the marker under the points plate. Use a long wrench to turn the engine over, never back, always clockwise! When the T line lines up with the marker, take off the valve adjustment cover for 1st cylinder, if it indeed is Top Dead Center, the valve arm will have a play that you can feel.
If not, turn it 360 degrees and this time it will have play.
Now you are ready to adjust the tension, turn the crankshaft 15 more degrees forward, loosen up the nut and than the bolt on the tensioner and let it jump forward. Tighten the bolt and the nut and you are done.
If you take the tensioner off, take it apart, clean it and lube it and make sure the shaft moves smoothly, sometimes it takes some polishing to remove marks from the bolt on the shaft.
There is a gasket that goes under the adjuster, but light coat of gasket maker will work too - I never bother with gaskets at this place.
Nothing wrong using gasket maker on SOHC4 engine, but globs of siliconm loose in the systems are engine killers, use very little of gasket maker, I usually take a small knife and spread it like butter on the sealing surface.
