Engine Drop
You've gotten some good advice concerning loosening stuck bolts. Sometimes a long breaker bar is what it takes! However, when working under an automobile, double check that the vehicle is adequately supported, preferably with heavy duty jackstands. It is not a bad idea to position a floor jack so that it will act as a backup if the vehicle is jerked off the stands. That is one BIG advantage of using an air wrench. The torque is applied to the bolt around 360 degrees so there is no tendency to rock or move the entire vehicle. The other thing to remember is that air wrenches are not all created equal. I have a 1/2 inch drive Wal-Mart special that will make 250 ft/lbs of torque on 90 psi line pressure. Does a good job most of the time. However, after failing to remove stubborn fasteners a couple of times, I went looking for a stronger wrench. Ingersol Rand makes a 1/2 inch drive air wrench that makes 600 ft/lbs of torque on 90 lbs of line pressure when unfastening a bolt. I have yet to "encounter" any fastener that it won't unscrew or twist off!!!! This is a classic case of you get what you pay for. The WalMart wrench was $50, the Ingersol Rand wrench runs about $180. Also, if you are using a quick disconnect coupler, sometimes you can gain some torque by removing the coupler and screwing the air hose directly into the wrench.
Good Luck
Fred Cook
'80 911SC
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