Download SPECIAL TOOL REQUIRED (or equivalent) ^ J-33039-A, Cam drive belt tension adjustment wrench. NOTE: O.E. manuals do NOT provide images of the timing marks, however, the alignment marks are located on the camshaft and crankshaft gears and the rear timing belt cover. REMOVE OR DISCONNECT 1. Battery ground cable, then partially drain cooling system. 1991 Pontiac J2000/Sunbird L4-121 2.0L 2. 3. 5. 6. 7. 8. 9. Coolant recovery reservoir. Serpentine, A/C and/or P/S drive belts (if equipped). Crankshaft pulley. Timing belt cover attaching bolts and the cover. Align marks on timing gears with the marks on the rear timing cover. Loosen water pump bolts, then using J-33039-A on the water pump eccentric, release the belt tension. Timing belt. INSTALL OR CONNECT 1. Turn crankshaft and camshaft gears clockwise to align timing marks on timing belt rear cover. 2. Timing belt, making sure that the portion between the crankshaft and camshaft gears is in tension. 3. Using J-33039-A rotate water pump eccentric clockwise until tensioner contacts high torque stop, then tighten water pump bolts slightly.