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How to Replace a 1993 Corolla Timing Belt

The Corolla is a line of compact cars that Toyota has manufactured since 1966, and the seventh generation of this series includes the 1991 through 1998 models. The timing belt in this vehicle allows the crankshaft to drive the camshaft, and requires periodic replacement. A 1993 Toyota Corolla was available with a 1.6-liter engine and a 1.8-liter engine. The procedure for replacing the timing belt differs slightly, depending on the engine in your vehicle.

Instructions

1

Remove the cable from the negative battery terminal with a socket wrench. Raise the front of the vehicle with a jack, and support it on jack stands. Disconnect the reservoir tank for the windshield washer fluid. Remove the right front splash shield, and remove the right front wheel with a lug wrench. Lower the vehicle.

2

Loosen the mounting bolts for the air conditioning compressor and power steering pump when a socket wrench, if your vehicle is so equipped. Loosen the adjusting bolts for the alternator, and detach the drive belts.

3

Detach the wiring harness on the apron of the right front fender. Place a wooden block on the floor jack to serve as a cushion, and support the engine with the floor jack. Disconnect the through-bolt from the right engine mount with a socket wrench.

4

Raise the engine slightly with the floor jack, so you can access the pulley for the water pump. Disconnect the pulley with a socket wrench, and lower the engine. Use masking tape to label the spark plug wires. Remove the spark plugs and valve cover.

5

Turn the crankshaft clockwise with a socket wrench to align the timing marks. Align the crankshaft marks at zero; look through the oil filler hole on the pulley and make sure you can see the hole in the end of the camshaft. Remove the timing belt covers and front engine cover with a socket wrench.

6

Disconnect the guide for the timing belt with a socket wrench, and loosen the mounting bolt for the idler pulley. Pull the idler pulley as far to the left as possible, and tighten the mounting bolt to hold the idler pulley in place temporarily. Detach the timing belt from its pulleys.

7

Hold the idler pulley in your hands, and ensure that it turns freely. Replace the idler pulley if it makes any noise when you spin it.

8

Measure the free length of the tension spring. This length should be 1.453 inches for the 1.6-liter engine and 1.252 inches for the 1.8-liter engine. Measure the springs from the inside faces of the hooks. Replace the tension spring if it has stretched.

9

Grip the hexagonal head of the camshaft with a wrench, and remove the mounting bolt for the crankshaft pulley. Remove the pulley from the crankshaft. Turn the camshaft pulley clockwise with a hex wrench to align the knock pin on the camshaft with the corresponding groove on the camshaft pulley. Perform this step only if your vehicle has a 1.6-liter engine.

10

Hold the crankshaft pulley so the flange faces towards the crankshaft. Align the key on the crankshaft with the groove on the crankshaft pulley, and slide the pulley onto the crankshaft. Fasten the mounting bolt for the pulley, and hold the camshaft in place with a hex wrench. Tighten the mounting bolt for the crankshaft pulley to 43 foot-pounds with a torque wrench.

11

Install the idler pulley and its tension spring. Fasten the mounting bolt for the pulley by hand, and push the pulley to the left as far as possible. Tighten the bolt temporarily with a socket wrench. Turn the camshaft clockwise to align the hole on the camshaft pulley with the mark on the bearing cap. Turn the crankshaft clockwise so that the groove on the crankshaft pulley points straight up.

12

Install the new timing belt to the crankshaft pulley, and attach the guide for the timing belt so the cup of the belt faces outward. Connect the number 1 timing cover, and tighten its mounting bolts to 65 inch-pounds with a torque wrench. Align the groove on the crankshaft pulley with the zero mark on the number 1 timing belt cover.

13

Turn the crankshaft pulley two full turns clockwise, and align its timing marks again. Tighten the mounting bolt for the idler pulley to 27 foot-pounds with a torque wrench. Adjust the tension on the timing belt by turning the tensioner with a socket wrench. The deflection of the timing belt should be between 0.20 and 0.24 inches when you place 4.4 pounds of pressure in the middle of the longest belt span.

14

Install the number 2 and number 3 timing belt covers with a socket wrench. Torque the mounting bolts for the timing belt covers to 65 inch pounds with a torque wrench. Torque the mounting bolt for the crankshaft pulley to 87 foot-pounds.

15

Complete the timing belt installation by performing steps one through four in reverse order.