Hi,
Yes your tensioner needs to be pushed in.
I use a long extention and push it in while I put the sprocket on.
Sometimes it helps to turn the crank a little.
Having 3 hands helps. You'll figure it out... <img src="/forums/images/graemlins/rolleyes.gif" alt="" />

1991 FJ 80 Land Cruiser for fun.
1998 GS300 for the wife
1998 GS400 for me
1991 Supra SOLD
1986 4Runner 335k miles-22re EB inside.SOLD