blasted that bitch with the impact gun on full and called it a day

 

Every time I torqued that nut I had my 120lb girlfriend do chin-ups on a 3 foot cheater bar slid over the breaker bar. Until the cheater bar stopped moving downward.

Always owed her lunch after that.

 

pics or it didnt happen

 

impact is much easier. I have a huge blue-point torque wrench that goes to 600 ft-lbs. Getting the stupid flywheel to hold still for that thing and then when the wrench clicks good luck

 

Here's the show stopper. I USED A 1" Impact gun. Good for 1200 ft lbs AND IT STILL CAME LOOSE @ 90psi of shop air. (we have 1/2" air fittings, I work at a CAT equipment dealer.) I knew it came loose cuz I removed the inspection plate and pryed back on the flywheel and man was it loose. Did it all again and did ir properly with a snap-on 600 ft lb torque wrench and no more problems. I'll never guess it again. Ive rebuild a number of motors since then and always torqued it. None came loose yet. Do it right.

 

Just because you did all that, does not mean that the flywheel was seated properly, when you tightened it. Although, with a taper fit, it is hard, near impossible, to misalign it. Maybe the key was holding it from seating all the way. If that was the case though, you would have had trouble bolting up the transmission.

How do you know you were getting 1200 ftlbs from your gun? Is that the rating for tightening, or loosening? You do make a good point though, if you do it with an impact gun, you don't know exactly how much torque you are putting on it.

I like to mark the flywheel and nut before I remove them, and then reinstall to the same mark, or a little more.