1. Top dead center (TDC) - the highest position that each piston reaches when the crankshaft rotates. Each piston reaches TDC on the compression stroke and on the exhaust stroke, but the TDC of piston #1 on the compression stroke is selected to adjust the ignition timing.
2. Piston and cylinder #1 are on the right end of the engine. Note that the crankshaft rotates clockwise when viewed from the right side of the vehicle.
3. Disconnect the negative cable from the battery, and remove all spark plugs as described in Section 1.
4. Release the distributor cover from the fasteners and remove it together with the high voltage wires.
5. Turn the steering to the extreme right position. Loosen and remove the three cover screws on the right side of the lower engine skid plate, and remove the cover to access the crankshaft pulley bolt.
6. Using a socket and an extension rod, rotate the crankshaft at the pulley bolt clockwise until the notch on the inner rim of the pulley is aligned with the mark "0" on the drive chain cover (see illustration).
7. With the crankshaft in this position, #1 and #4 pistons are now at TDC, one of them on the compression stroke. If the distributor slider points to a notch in the distributor rim, then the #1 piston is placed correctly (see illustration). If the distributor slider points in the opposite direction, turn the crankshaft one full turn (360°) clockwise.
8. After placing the No. 1 piston at TDC on the compression stroke, any subsequent piston in the order of cylinder operation can be set to TDC by turning the crankshaft clockwise by 180° (see specs).