This response outlines the general steps. Consult a factory service manual specific to your 1999 Toyota Tacoma V6 (3.4L 5VZ-FE engine) for precise instructions, torque specifications, and diagrams. The manual will also detail the proper tools required.
I strongly recommend seeking professional help from a qualified mechanic if you are not comfortable performing this task.
General Steps (Consult your service manual for specifics):
1. Safety First: Disconnect the negative battery terminal. Use jack stands to securely support the vehicle.
2. Preparation: Gather all necessary tools, including:
* Timing belt kit (belt, tensioner, idler pulleys – replace these even if they seem fine)
* Socket set (various sizes)
* Wrenches (various sizes)
* Torque wrench (essential for proper tightening)
* Jack and jack stands
* Pry bar
* Ratchet and extensions
* Possibly a crankshaft pulley holder
* Timing belt alignment tools (often included in kits or available separately)
* Shop rags
* Safety glasses
3. Access: Remove components that obstruct access to the timing belt, such as:
* Serpentine belt
* Upper and lower radiator hoses (may need draining coolant)
* Some components in front of the engine
4. Crankshaft and Camshaft Position: Rotate the engine to Top Dead Center (TDC) on the #1 cylinder. This is critical for proper timing. Use the timing marks on the crankshaft pulley and camshafts to verify TDC. Your service manual will show you exactly where to find these marks and how to verify them.
5. Remove Old Timing Belt: Carefully remove the old timing belt, noting the route and position of the belt. Take pictures if it helps.
6. Inspect Components: Inspect all pulleys, tensioner, and water pump for wear or damage. Replace any worn or damaged parts.
7. Install New Timing Belt: Install the new timing belt, carefully following the route and alignment marks indicated in your service manual. Ensure the belt is properly seated on all pulleys.
8. Tensioner and Idler Pulley Installation: Install the new tensioner and idler pulley (if included in your kit). Tighten to the manufacturer's specified torque.
9. Verify Timing: Double-check the timing marks on the crankshaft and camshafts. Rotate the engine two full revolutions by hand to verify everything lines up correctly. If not, disassemble and redo this step. Incorrect timing will cause serious engine damage.
10. Reassembly: Reinstall all removed components, tightening everything to the manufacturer's specified torque.
11. Fluid Levels: Check and refill coolant and engine oil as needed.
12. Test Run: Start the engine and listen for any unusual noises. Check for leaks. Let the engine run for a while to ensure everything is functioning properly.
Again, this is a simplified overview. Do not attempt this repair without a factory service manual specific to your 1999 Toyota Tacoma V6. If you are not comfortable performing this repair, seek professional help from a qualified mechanic. Improper installation can result in severe engine damage.
