How to replace the timing belt on a 1969 AMC AMX?

If your 1969 AMC AMX is experiencing issues with its engine timing, such as irregular idling, poor performance, or a rattling noise from the engine bay, it may be high time to replace the timing belt. A faulty or worn-out timing belt can lead to engine misfires or, in severe cases, extensive engine damage. Here is how to solve this issue.

Step 1: Preparation

Before starting, ensure that you have all the necessary tools and a new timing belt. Typically, you'll need a socket set, screwdrivers, and possibly a crankshaft pulley puller. Make sure the vehicle is parked on a flat surface and the engine is cool.

Step 2: Disconnect the Battery

For safety, disconnect the negative terminal of the battery. The battery is typically located in the engine bay, on the left side, and features two thick cables attached to it. Use a wrench to loosen the nut on the negative terminal and remove the cable.

Step 3: Remove Engine Covers and Accessories

Start by removing the air intake assembly and any engine covers that obstruct access to the timing belt. The air intake is usually located at the front or side of the engine bay and is attached with hose clamps or bolts. Once removed, carefully set them aside.

Step 4: Locate the Timing Belt Cover

The timing belt cover is typically located at the front of the engine, covering the camshaft and crankshaft gears. It’s often a plastic or metal cover fastened with several bolts. Remove these bolts using a socket wrench and carefully pull off the cover to expose the timing belt.

Step 5: Align Timing Marks

Before removing the old timing belt, pay particular attention to the alignment marks on the camshaft and crankshaft gears. These marks must be aligned correctly to ensure proper engine timing. Use a ratchet to turn the crankshaft pulley until each mark aligns with the corresponding indicator on the engine block.

Step 6: Remove the Old Timing Belt

Loosen the tensioner pulley, typically a spring-loaded mechanism, to relieve tension from the belt. With the tension eased, you can now carefully slide the old timing belt off the gears. Note the path of the belt to assist with the installation of the new one.

Step 7: Install the New Timing Belt

Place the new timing belt onto the gears, ensuring it follows the same path as the old belt. Make sure that all the timing marks remain aligned. Re-tighten the tensioner pulley to apply the correct tension to the new belt.

Step 8: Reassemble

With the new timing belt securely in place, re-attach the timing belt cover, engine covers, and air intake assembly. Double-check all bolts and clamps to ensure they are tight and secure.

Step 9: Reconnect the Battery

Reconnect the negative terminal of the battery and secure it using a wrench.

Step 10: Test the Engine

Start the engine and let it idle. Listen for any unusual noises and ensure that it runs smoothly. A properly installed timing belt will result in a smooth, well-timed engine operation.

Having successfully replaced your 1969 AMC AMX’s timing belt, your vehicle should now perform better, with reduced risk of timing-related engine issues. Ensure to follow your vehicle’s maintenance schedule to prevent future problems.