yeah, like egg said.
i'm looking at the book, and from what i see, the first "ring" that is behind the sprocket should have a line or mark that indicates alignment. when at TDC, it should be pointing straight up and in line with the notch on the cam "carrier"
as far as the tensioner is concerned, its only a two position tensioner, meaning if the nylon "screw" is popped up, it's not set. you should push it down and counter clockwise to lock it. it only turns 90* so dont force it, or you could break it.
Since you say the engine is running, it makes me think that something ELSE could be the culprit.
you say you followed the tutorial. did you wire the chain to the sprocket? if you did, then the bottom chain will not have been affected unless you accidentally tapped the starter or something.
You also said its sounds different. Mine did too, but thats because i had a few vacuum lines to replace and i had to change out the contact points.
But anywho...
This is what the book says word for word:
1.) Check that the distributor point gap is set correctly before adjusting ignition timing
2.) Check that engine is idling at a smooth rate
3.) Check that contact breaker is working properly
Adjustment:
1.) Start engine and bring to normal operating temperature of 82*c (180*F)
2.) Connect timing light lead to either number 1 or number 4 cylinder
3.) ignition timing can be adjusted by loosening distributor clamping bolt and turning distributor. With timing light aimed toward timing mark. For best results, timing should be set at 6 degrees BTDC @ 900 RPM (All except Federal M/T) Or 800RPM (Federal M/T) With vacuum advance line plugged.
End
Just so you know,(and in case you cant see it for the grease), looking at the lines ON TOP of the timing stub, 6 degrees is just AFT of the middle line.
ADDITIONALLY,
Check your valves to make sure they are all within spec.
do this with the engine COLD.
taking the spark plugs out will make this a little easier, but it's not necessary.
rotate the engine until the lobe for each rocker is pointed straight down, THEN adjust that particular valve to spec. The intake should be gapped at 0,006" or 0.15mm and the exhaust should be at 0.010" or 0.25mm
make sure you use a quality feeler gauge since i've compared the cheap ones to the good name brand stuff, and they can be WAAAAY off!
REPORT BACK UPON COMPLETION OF THESE ASSIGNMENTS!
ON THE BOUNCE TROOPER!

JK
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To the Oquirr hills for awesome thrills! Go-go 4wd, Activate!