Cover granta var2.indd
We check the condition of the timing belt on a cold engine (15–35 ° C) every 15 thousand kilometers.
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The hexagon “5” unscrews the four screws that secure the front upper cover of the timing belt …
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… and remove the cover.
We post the right front wheel and engage fifth gear in the gearbox. Rotating the wheel clockwise, we rotate the engine crankshaft and inspect the timing belt. Under normal belt tension …
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… the cut-out 1 of the outer disk of the tension roller should coincide with the rectangular protrusion 2 of its inner sleeve.
The surface of the gear part of the belt should not have folds, cracks, undercuts of teeth and delamination of the fabric from rubber. The reverse side of the belt should not have wear, exposing the cord, and no signs of burning. On the end surfaces of the belt there should be no delamination and disintegration. If defects are found on the belt or a significant discrepancy between the elements of the belt tension control (see photo above) is necessary to replace the belt. You should also change the belt to a new one if any traces of engine oil are found on it (before installing a new belt, the cause of oil getting onto the belt must be eliminated) or when replacing the coolant pump.
Failure of the timing belt (breakage and cutting teeth) can lead to sticking of the valves into the pistons due to a mismatch in the angles of rotation of the crankshaft and camshafts and, as a result, to expensive engine repair.
In accordance with the maintenance schedule, we replace the timing belt in every 75 thousand kilometers or if defects are found on the belt. Remove the right front wheel and the right mud guard of the engine compartment (see "Removing the mudguards of the engine compartment").
Dismantle the generator drive belt (see "Checking the condition and replacing the generator drive belt").
Remove the crankshaft position sensor (see. "Removing the crankshaft position sensor").
Before dismantling the belt, it is necessary to check the valve timing of the engine - set the piston of the 1st cylinder to the TDC (top dead center) compression stroke. For this…
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… turn the crankshaft clockwise by the “17” head over the bolt of the alternator drive pulley mounting bolt …
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… until the mark 1 is combined on the camshaft gear pulley with tide 2 on the timing case back cover.
To make sure the crankshaft is in the correct position …
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… take out the rubber plug of the inspection window at the top of the clutch housing.
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Risk 2 on the flywheel should be located opposite the slot 1 of the scale on the top cover of the clutch housing.
Before unscrewing a bolt of fastening of a pulley of a drive of the generator …
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… we ask the assistant to fix the crankshaft from turning by inserting a screwdriver between the teeth of the flywheel through the window in the clutch housing.
With the “17” head, we unscrew the bolt of the generator drive pulley …
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… remove the pulley …
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… and the puck.
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With the hexagon “5”, unscrew the three screws that secure the front lower cover of the timing belt …
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… and remove the cover.
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With a 15 ° ring wrench, weaken the tightening of the tension roller bolt.
In this case, the tension roller will rotate and the belt tension will loosen. Remove the timing belt from the pulleys of the crankshaft and camshafts …
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… and take out the belt from the engine compartment.
After removing the timing belt, the crankshaft and camshafts must not be rotated to prevent the pistons from sticking into the valves.
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Timing belt timing marking (width 17 mm, number of teeth 113).
To remove the belt tension roller we unscrew the bolt of its fastening …
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… and remove the tension roller.
To assess the condition of the idler roller bearing …
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… we rotate the plastic clip of the roller, holding it by the cam.
The roller should rotate silently, evenly and without jamming. Otherwise, the roller must be replaced. We establish a tension roller in place, without finally tightening the bolt of its fastening. For various engine modifications, two threaded holes for the tension bolt securing bolt are made in the cylinder head.
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Screw the roller mounting bolt into the upper hole of the cylinder head.
Install the timing belt in the reverse order. Before installing the belt, make sure that the alignment marks of the crankshaft and camshaft are combined. We put the belt on the toothed pulley of the crankshaft, then …
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… pulling both branches of the belt, we put the rear branch on the pulley of the coolant pump and put it on the tension roller, and put the front on the camshaft pulley.
If necessary, we turn the camshaft pulley in the direction of the smallest stroke until the teeth of the belt coincide with the pulley cavities. To tension the belt, turn the tension roller counterclockwise. To do this, insert into the grooves of the outer disk of the roller …
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… rods (∅4 mm, the distance between the rods - 18 mm) of a special key (for clarity, shown on the removed roller) …
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… or tongs for retaining rings.
We tighten the belt by turning the belt tension roller counterclockwise …
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… until the cutout of the outer disk of the roller coincides with the rectangular protrusion of its inner sleeve and tighten the bolt securing the roller to the required moment (see "Appendices").
Excessive belt tension reduces its service life, as well as bearings of the coolant pump and tension roller. Insufficient belt tension also leads to its premature failure and can cause a disruption of the valve timing.
We rotate the crankshaft two turns clockwise. Check the belt tension and the alignment of the alignment marks of the crankshaft and camshaft.
With the alternator drive pulley removed, the correct position of the crankshaft is convenient to control …
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… by aligning the mark 1 on the gear pulley of the crankshaft with rib 2 of the oil pump cover.