How can you possibly knock that bolt loose while doing the timing? It takes a great amount of force to break the crank pulley bolt loose. Sometimes, impact guns can't even do the trick. Regardless, torque that thing down to 170 or so ft/ lbs, or just tighten it up with an impact gun. Please share your story!
After I finished setting the timing, I left the tool on the bolt and started the engine. About tightening the bolt, I dont have an impact gun or torque wrench. How can tight it? Do I have to use anything to hold it from moving?
Put the car in 5th gear with the parking brake as high as it will go and torque the bolt with a torque wrench. On an automatic car you need to block the flexplate to keep it from moving. A torque wrench is the proper tool for the job, better buy or borrow one.
Dam, that mean I am out of luck. I tried to get the crank pulley out once from the junkyard and never got it (funny hu). I did use plate screwdriver to jam the teeth and it was still moving. I guess it is a 2 person job.
if you have an autozone around your house they do rent out tools, like torque wrenches and other specialty tools you may need, another tool that would help you tighten it is a chain wrench, just put the chainwrench on the pulley, rest it up against something that won't move or have someone else hold it, and then tighten the bolt until you are satisfied. You gotta have it tight to, one time my friend helped build a prelude and the bolt came off threw the balancer off and bye bye engine, had to get a new crank and all....it sucked ass......good luck man, hope you get it tight