Timing Belt Tension Adjustment Procedure (Hyundai Sonata Y3)

1. Remove the upper front timing belt cover.

2. Turn the crankshaft clockwise and make sure there are no malfunctions.

3. Turn the crankshaft clockwise until the piston of the first cylinder is at the top dead center of the compression stroke.

Caution: Be careful not to turn the crankshaft counter-clockwise when aligning the timing marks, as this may cause incorrect belt tension.

4. Remove the two covers that block access to the inside of the case. They are easily removed by inserting a screwdriver into the slots in the direction of the convex arrow and using it as a lever.

5. Using a 14mm socket wrench, loosen the timing belt tensioner bolt and nut.

Warning: Loosen the bolt and nut 1/2 to 3/4 of a turn, if you loosen them more than necessary, they may fall inside the cover.

6. Turn the crankshaft and camshaft pulley two teeth clockwise.

Warning: Be careful not to turn the crankshaft counterclockwise, this will put stress on the tensioner and may affect the belt tension adjustment.

7. Insert a flat-head screwdriver from the top of the timing belt cover. Press the tensioner lever lightly, then lower the lever. The belt tension will now be adjusted automatically.