The timing marks are located near the top of the crankshaft pulley on the plastic timing belt cover. There is a notch in the pulley to mark TDC (Top Dead Center) Align the notch with the 0 mark on the plastic cover to set your base timing. Ground the proper circuit on the ALDL connecter located under the dashboard somewhere under the steering wheel. Check the manual for the proper circuit to ground. With the engine warm and the circuit grounded. Set the proper timing. Un-ground the circuit and you are done.
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Double check crankshaft timing mark, on your lower timing cover has some timing marks - crankshaft should be on the 0 mark. Camshaft timing marks--intake camshaft mark set at 3 o'clock and exhaust camshaft mark set a 9 o'clock. These timing marks are critical for motor to run and start correctly. These timings marks can move while trying to install the timing belt. After, you confirm or reset timing and belt, you can confirm timing is correct by rotating the crankshaft twice. Your timing marks should be on right on timing marks discussed at the top of the page. If timing marks are off, start over with timing process.
You need a timing light. You hook it to the no.1 cylinder and it flashes when that cylinder sparks. Aim the light at the crank. There is a timing mark on the crank and on the motor. You turn the distributor till the marks line up.
timing marks are on the crankshaft you will see a notch its set there and you will see a mark dead center on the block straight up at 12;00 set that at compression stroke and set the cam gear on the left even with the block the notch in that is also at 12;00 straight up