On Oct 2, 6:47*am, wrote:
how do the spec-s of an air impact wrench relate to the air
compressor?
i need to loosen a crankshaft pulley bolt that is torqued at 134 ft-
lb. on a 1998 honda civic LX. * i have a sears craftsman 1.5hp 4-
gallon @90psi *air compressor. *i don't yet
have an air impact wrench. *what should i look for in terms of psi
when i go to buy one, such that i can use that air compressor to drive
the impact wrench to loosen the bolt? tia.

Buy a twin hammer impact like the IR 231 (I have a Porter-Cable knock-
off, $105) and it will take off the bolt in a heart beat. Been there,
done that. Old fashioned puny impacts simply won't get the job done.
Look for a lb-ft rating of 400 or better (600 is good) and don't worry
about PSI. Just set your compressor to something over 110 lbs or so if
you can and go for it. The bolt will be off before the compressor
needs to cycle again.
The twin hammer impacts are also perfect for removing lawn mower
blades, putting on snow tires (use wheel chocks) and similar chores.
Have fun.

Joe