However, if you're determined to do it yourself, here's a general overview. This is NOT a complete guide, and you'll need a repair manual specific to your vehicle's year and engine (likely a 2.4L Ecotec). A Haynes or Chilton manual is a good place to start.
Before You Begin:
* Consult a repair manual: This is crucial. The manual will provide precise torque specifications, component locations, and the proper procedure.
* Gather tools: You'll need a variety of tools, including various wrenches (metric), sockets, a timing belt tool kit (often including a crankshaft pulley holder and camshaft alignment tools), jack stands, a torque wrench, and possibly a harmonic balancer puller.
* Gather parts: Besides the timing belt, you'll likely need a new water pump (highly recommended since it's often done at the same time), tensioner pulley(s), and possibly seals.
* Safety first: Work in a well-ventilated area. Disconnect the negative battery terminal to prevent electrical shorts.
General Steps (Consult your repair manual for specific details):
1. Preparation: Disconnect the negative battery terminal. Drain the coolant. Remove the serpentine belt. Access the timing belt by removing various components (depending on the specific engine, this might include removing the upper and lower radiator hoses, various covers, and potentially other ancillary components. Your repair manual will detail this).
2. Align the timing marks: This is CRITICAL. Use the crankshaft pulley and camshaft sprockets to align the timing marks to their respective marks on the engine block. The repair manual will show you where these marks are located and how they should align. Incorrect alignment will result in engine damage.
3. Remove the old timing belt: Carefully remove the old timing belt, noting the orientation of the belt and the routing.
4. Install the new timing belt: Install the new timing belt, ensuring it's routed correctly according to the repair manual. Use the tensioner pulley to tension the belt to the specifications provided in the manual. Your timing belt tool kit will have tools to aid in this process.
5. Reinstall components: Reinstall all components you removed earlier, paying attention to torque specifications (again, the repair manual is crucial here).
6. Refill and check: Refill the coolant and check for leaks. Start the engine and listen for any unusual noises. Check the timing belt for proper tension.
Important Considerations:
* Camshaft position: Be meticulous in aligning the camshafts correctly.
* Tensioner: Ensure proper tension on the timing belt. Too loose or too tight can be damaging.
* Torque specifications: Use a torque wrench to tighten all bolts to the manufacturer's specifications.
* Water pump: Replacing the water pump simultaneously is highly recommended.
* Alignment tools: Using the correct alignment tools is essential for proper timing belt installation.
This is a simplified overview. The actual procedure is much more involved and requires specific knowledge and tools. Again, using a repair manual specific to your 2000 Pontiac Grand Am 4-cylinder is absolutely necessary. If you're unsure about any step, seek professional help. A damaged engine caused by an improperly installed timing belt will cost far more than a professional repair.
