The crank bolt is a torque-to-yield fastener. Press on the damper and torque the old bolt up to 250 lb-ft. Then remove that bolt and throw it away-a new bolt is $3. Now torque the new bolt to 37 lb-ft and lock the engine to prevent it from turning. Then turn the crank bolt 140 degrees. You'll need a 11/42-inch drive breaker bar and a "cheater" to do this effectively.