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How to Set Timing Belts

The timing belt is a part of the cars engine that controls valve timing. Setting the timing belt is an important aspect of automotive repair and maintenance. Proper synchronization of the engine valves and pistons is vital to proper operation. If the timing belt is set improperly it could lead to larger problems. In some cases, an improperly set timing belt can cause collision between the valve and pistons. This will lead to costly repairs, so it is important to set the timing belt correctly.

Instructions

1

Disconnect the battery by removing the cable from the negative battery terminal using the appropriate size wrench. Remove all accessory drive belts and brackets that impede access to the timing belt cover.

2

Place wheel chocks against one of the rear wheels to prevent movement, and put the car in park or neutral. This will allow free rotation of the crankshaft.

3

Use a socket and wrench to turn the crankshaft clockwise until the crankshaft pulley timing mark aligns with the zero degree or top dead center (TDC) mark on the timing cover.

4

Remove the timing belt cover by removing the perimeter bolts. With the crank pulley at TDC, check the camshaft timing mark alignment. The mark on the camshaft sprocket should align directly with the timing mark on the rear timing belt cover. If the camshaft timing marks are not aligned adjustment is necessary.

5

Loosen the tensioner bolt to allow movement of the tensioner pulley. The tensioner will look like a smaller pulley. Caully pry the tensioner pulley away from the belt and retighten the tensioner bolt. This will relieve the tension on the timing belt allowing it to be set.

6

Align the camshaft timing mark using the appropriate wrench. The timing belt should be loose enough to allow turning of the camshaft sprocket without moving the belt. Once aligned, re-seat the timing belt on the camshaft sprocket.

7

Loosen the tensioner bolt allowing the tensioner pulley to tighten the belt. The tensioner is spring loaded and should apply the proper tension needed. Tighten the tensioner bolt.

8

Check the alignment of the crankshaft and camshaft timing marks. If aligned properly, turn the crankshaft two complete revolutions, returning the crankshaft to the TDC position. Check all timing marks to make sure the timing belt is set properly.

9

Replace the timing belt cover, accessory belts and reconnect the cable to the negative battery terminal. Start the engine and check for proper throttle response and resting idle. If the belt is set properly the engine should run smoothly while idling.

Posted by Unknown at 8:15 AM

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