Parts Needed:
- Timing belt
- Timing belt tensioner
- Timing belt idler pulley
- Camshaft and crankshaft seals
- Water pump (optional, if yours is leaking or due for replacement)
Tools Needed:
- Socket set
- Wrench set
- Torque wrench
- Timing light
- Feeler gauge (if adjusting valve lash)
Step 1: Preparations
- Disconnect the negative battery terminal to ensure safety.
- Raise the vehicle and place it on jack stands for better access to the engine.
Step 2: Removing the old Timing Belt
- Remove the accessory drive belt(s) that run across the engine.
- Locate the timing belt covers and remove them to expose the camshaft and crankshaft sprockets.
- Ensure the engine is at Top Dead Center (TDC) by aligning the crankshaft timing mark with its indicator on the engine block. This position also ensures proper timing for cylinder #1.
Step 3: Removing the old Timing Belt and Components
- Loosen the timing belt tensioner pulley bolt or nut and release the tension on the belt.
- Remove the old timing belt from the sprockets.
- Inspect the condition of the camshaft and crankshaft seals. If they are worn or leaking, replace them at this time.
Step 4: Preparing the new Timing Belt
- Inspect the new timing belt and ensure it is of the correct size and specification for your engine.
- Lay the new timing belt onto the sprockets, guiding it around the water pump (if applicable), idler pulley, and tensioner pulley.
Step 5: Applying Tension and Setting Timing
- Refer to your vehicle's service manual for the recommended timing belt tension specifications. Using a torque wrench, apply proper tension by adjusting the tensioner pulley.
- Double-check that the crankshaft and camshaft timing marks are aligned accurately.
Step 6: Final Checks
- Rotate the engine crankshaft manually by hand (without starting the engine) 2 complete revolutions. This check ensures proper timing and identifies any potential binding or interference issues.
- Reinstall the timing belt covers and accessory drive belts removed earlier.
Step 7: Starting the Engine
- Reconnect the negative battery terminal.
- Start the engine and let it run for a few minutes. Monitor for any unusual noises or inconsistencies in operation.
Step 8: Timing Light Adjustment (optional)
- Use a timing light to verify that the engine timing is set correctly. This procedure involves connecting the timing light to the engine's ignition system and visually inspecting the alignment of the timing marks as the engine runs.
- If adjustment is required, refer to your vehicle's service manual for specifics on adjusting the ignition timing. This may involve rotating the distributor or using an adjustable camshaft sprocket (if equipped).
Completing these steps properly ensures that the timing of your 1995 Buick Skylark's engine is set correctly. If you're not comfortable performing these tasks yourself, it's best to consult a qualified mechanic or refer to a specific repair manual for additional details and considerations related to your model and engine.
