However, if you're determined to do it yourself, here's a *general* outline of the process. Remember, this is a simplified overview and specific procedures might vary slightly depending on the exact engine configuration. Always consult a repair manual specific to your 1997 Pontiac Sunfire 2.2L engine. A Haynes or Chilton manual will provide detailed instructions, diagrams, and torque specifications crucial for successful completion.
1. Preparation:
* Safety First: Disconnect the negative battery cable. Use jack stands to securely support the vehicle.
* Gather Tools and Parts: You'll need a complete set of metric sockets and wrenches, a torque wrench, timing chain tools (specific to the 2.2L engine – these are crucial and often require special purchase), a new timing chain kit (including chain, sprockets, guides, tensioner, and seals), a shop manual, and possibly a harmonic balancer puller.
* Drain Fluids: Drain the engine oil and coolant.
2. Accessing the Timing Chain:
* Remove Accessories: This typically involves removing belts, pulleys, and various engine components to gain access to the timing chain cover. Your repair manual will detail the specific order and procedures.
* Remove Timing Cover: Carefully remove the timing chain cover. Be mindful of any gaskets or seals you'll need to replace.
3. Timing Chain Replacement:
* Mark Positions: Before disturbing anything, meticulously mark the positions of the crankshaft and camshaft sprockets relative to each other and the engine block. This is absolutely critical for correct reassembly.
* Remove Old Chain: Carefully remove the old timing chain, paying attention to the tensioner and guides. You'll likely need specialized tools to hold the sprockets in place while removing the chain.
* Install New Chain: Install the new timing chain, ensuring it's properly seated on all sprockets. Use the appropriate tools to ensure proper tension.
* Install Tensioner: Install the new timing chain tensioner according to the manufacturer's instructions.
* Install Guides: Install new timing chain guides.
4. Reassembly:
* Replace Seals and Gaskets: Replace all seals and gaskets on the timing chain cover and any other components removed.
* Reinstall Components: Reinstall all removed components in the reverse order of removal, paying close attention to torque specifications.
* Refill Fluids: Refill the engine oil and coolant.
5. Verification and Testing:
* Verify Timing: After reassembly, verify the timing is correct by checking the marks you made earlier. Double and triple check!
* Start Engine: Carefully start the engine and listen for any unusual noises. Check for leaks.
* Check for Problems: Observe the engine temperature and oil pressure.
Important Considerations:
* Torque Specifications: Following the correct torque specifications for all bolts is absolutely critical to prevent damage.
* Repair Manual: A repair manual specific to your vehicle is essential. This guide is a broad overview, and specific steps and torque values may vary significantly.
* Special Tools: You will likely need specialized tools, which can be rented or purchased.
* Complexity: This is a complex job that requires considerable experience and skill.
Again, I strongly advise against attempting this repair unless you have significant experience working on engines. The risk of damaging your engine is very high if you're not familiar with the procedures and tools involved. The cost of a professional repair is significantly less than the cost of a damaged engine.
