How to replace the timing belt on a 1967 Shelby GT500?

Replacing the timing belt on a 1967 Shelby GT500 is an essential task to ensure the proper functioning of your vehicle. The timing belt helps synchronize the rotation of the crankshaft and camshaft, allowing the engine's valves to open and close at the correct intervals. If you notice signs such as a rough idle, misfires, or unusual noises coming from the engine bay, it might be time to replace the timing belt. Here is how to solve this issue:

Step 1: Prepare Your Work Area
Before you start, ensure you have all the necessary tools and parts, including a new timing belt, wrenches, ratchets, screwdrivers, and a timing belt tensioner if needed. Park your car on a flat surface and disconnect the battery to prevent any electrical mishaps during the process.

Step 2: Locate the Timing Belt Cover
Open the hood of your Shelby GT500 and locate the timing belt cover. The cover is usually on the front of the engine and can be identified as a large, often black, plastic casing secured with bolts.

Step 3: Remove the Accessory Belts
To access the timing belt, you’ll need to remove the accessory belts. These are the belts connected to the alternator, water pump, and other components. Loosen the tensioners for these belts and slide them off their pulleys.

Step 4: Remove the Timing Belt Cover
Using the appropriate wrenches or socket set, remove the bolts securing the timing belt cover. Once all bolts are removed, carefully take off the cover to expose the timing belt and pulleys.

Step 5: Align the Timing Marks
Turn the crankshaft manually using a ratchet and socket until the timing marks on the crankshaft pulley and camshaft pulleys are aligned. This ensures that the engine is in the correct position to maintain timing when you install the new belt.

Step 6: Remove the Old Timing Belt
Loosen the tensioner pulley to relieve tension on the timing belt. Carefully slide the belt off the pulleys and remove it from the engine bay. Be cautious not to disturb the alignment of the camshafts or crankshaft.

Step 7: Install the New Timing Belt
Begin by placing the new timing belt over the crankshaft pulley and then over the camshaft pulleys, ensuring the timing marks remain aligned. Follow the path the old belt took, making sure the belt is snug and properly engaged with all teeth on the pulleys.

Step 8: Adjust the Tensioner
Re-tension the new timing belt by adjusting the tensioner pulley. The tension should be firm but not overly tight. Refer to the vehicle’s service manual for the precise tension specifications.

Step 9: Reassemble the Components
Once the new timing belt is in place and properly tensioned, replace the timing belt cover and secure it with the bolts. Reinstall the accessory belts and adjust their tension accordingly.

Step 10: Reconnect the Battery and Test
Reconnect the battery and start the engine. Listen for any unusual noises and ensure the engine runs smoothly. If everything sounds and feels correct, you’ve successfully replaced the timing belt.

Conclusion:
Completing the timing belt replacement on a 1967 Shelby GT500, while a meticulous task, can greatly enhance the performance and longevity of your vehicle. Always refer to the specific service manual for your car for detailed instructions and torque specifications.