[spannerman]

Spannermans simple timing chain adjustment.
DO NOT START THE ENGINE.
Select 4th gear
crack tensioner nut
Gently roll car forward letting engine turn only a few degrees.
Lock up tensioner nut
Don't let the engine turn backwards doing this.

Done

 

[spannerman]

Turning the engine backwards with the tensioner nut released WILL cause the tensioner to compress and the chain to slacken off potentially letting the chain jump on the gears.
All timing chain and belt tensioners are on the slack side of the chain/belt when the engine is turning for this reason.