1987 Other Oldsmobile Models harmonic balancer

You may try, but you will never get it off without a puller! Autozone will rent then refund the rental fee, get the tool!

Either you drop the starter and jam the flexplate or use a long breaker bar brace it properly underneath-clear out of the way and crank engine over this will loosen it-or you can try an impact wrench-

Watch out for the Crank sensor if it has one-