I just put a crank pulley bolt in and it specified threadlock, so it might have that in. If it's on the engine, be sure you're locking it with something that doesn't have any give, anything that cushions the impact will lessen the effectiveness of your impact wrench.
Mine wouldn't loosen my lug nuts one time when I had the jack under it already with just a couple of pumps in, the give in the lightly loaded tire was enough to absorb all the shock and not let it work.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
That's a good point that many people don't realize. You should be using an impact gun on an impact socket, or else a lot of the "shock" (impact) will be absorbed by the socket and not transmitted to the bolt. Same thing with using extensions - if you do use an extension it should only be an impact extension (which twists a lot less).
A regular extension on a regular rachet will transmit all of the torque, since there is no "time" factor. It might take 0.05 seconds to react, but that's irrelevant to a human.
That's a good point that many people don't realize. You should be using an impact gun on an impact socket, or else a lot of the "shock" (impact) will be absorbed by the socket and not transmitted to the bolt.
I learned something new today. I thought the only reason was to avoid breaking the socket.
could be the fins are gummed up or worn. you could pull the back off and take a look. If they are gummed up, just take some brake fluid and clean them. If they are worn, get a fin kit. I have a snap-on xt7100 that i use everyday. After about a year, i noticed that it was taking a bit of time to get lug nuts broke free. I opened it up and the fins were wore down. After replacing them, it almost jumps out of my hand if im not paying attention.
But judging by how rarely you use yours, i would just guess that its gummed up and needs a good cleaning.
oh, make sure you use a quality air tool oil. I personally use MMO air tool oil. Mostly because i get it free, but its some good stuff. Another good brand is super red. Lucas makes some, but it is way too thick. Harbor freight brand is too think and offers no protection.
Thanks for the input guys I think you were all right- it was a combination of factors: rust around the shoulder of the bolt, the elasticity of the strap wrench I was using to hold the crank pulley stationary and the impact wrench was gunked up from me over oiling it with too much air tool oil through the years.
I figured that I had nothing to lose by spraying some carb cleaner into the air inlet to "cut" any excess oil inside it- so I did it and I noticed that it seemed stronger and would even spin faster (no load speed)- but it was still not strong enough.
The only thing I had to keep the crank pulley from turning was a rubberized strap wrench (this car has an auto transmission and I didn't feel like feeding a rope into a spark plug hole)- so I'm thinking that it was absorbing most of the impacts.
So, giving up on the impact wrench, I used a 2.5 foot cheater pipe on my 1/2" breaker bar. I twisted off one 1/2" extension section, but I heated the bolt center of the pulley with a propane torch and used another 1/2" extension that held ( I was using an impact socket). I was putting most of my weight on the cheater when it finally broke loose with a big pop- at first I thought that I had broken something!
Good info on the fins etc. I bet mine are gummed up too. I thought mine was losing some power recently, however, I was using a standard type extension (about a 3' extension at that).
I ended up using the starter and a ratchet leveraged against the floor to break it loose. Break is the key word cause it snapped the head off the crank bolt. DOH! I was really lucky that the rest of the bolt ended up loose so I was able to back the broken off bolt out with a small scribe. This was in my crx hf. Whew...
Harbor Freight sells a 1/2" drive electric impact that has lots of torque. I have one that I've had for 10-15 years and it's still as strong as it was the day I bought it. I've removed crank pulleys with it and it never flinched. If you'll keep an eye on their sales lots of times they will run them for $42.-$50.