Tensioning procedure
Install the timing belt on a cold engine (after the engine has cooled to ambient temperature).
Make sure the tension roller is correctly positioned on pin 1.
Make sure the crankshaft is locked with locking tool Mot. 1054.
Groove 4 of the crankshaft should be located 2 in the middle between the two ribs of the cylinder block cover, while groove 3 on the toothed pulley of the crankshaft should be shifted by one tooth to the left of the vertical axis of the engine.
Place a new timing belt on the pulleys, aligning the marks on the belt with the marks on the camshaft and crankshaft toothed pulleys.
Press the tension roller against the wheel by screwing in bolt 2 on the tension roller bracket.
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Remove the retainer Mot. 1054.
Fit the crankshaft pulley mounting bolt with washer 4 supplied with tool Mot. 1543.
Note: Be sure to remove the washer when installing the crankshaft pulley.
Fit tool Mot. 1543 and cap 1 onto the crankshaft pulley mounting bolt.
Create a pre-tension between the crankshaft timing pulley and the tension roller using tool Mot. 1543 and cap 1, using a torque wrench set to 11 Nm.
Install the Mot. 1505 instrument sensor.
Using bolt 2, tighten the belt until the required tension value of 88±3 Hz is achieved.
Tighten the tension roller axle mounting nut to 10 Nm,
Turn the crankshaft two revolutions.
Refit the Mot. 1054 locking tool and set the timing mechanism to the position corresponding to the valve timing setting, (start pressing the lock half a tooth before the mark on the toothed pulley of the camshaft is aligned with the mark previously applied on the inner casing of the timing drive, so as not to accidentally hit the balancing hole of the crankshaft).
Remove tool Mot. 1054 Create pre-tension between the crankshaft sprocket and the tension roller using tool Mot. 1543 and cap 1, using a torque wrench set to 11 Nm.
Install the Mot. 1505 instrument sensor.
Make sure the tension value is 85±3 Hz, if not, repeat the adjustment.
Tighten the tension roller axle mounting nut to a torque of 50 Nm.
Note: Strictly adhere to the specified tightening torque of the tension roller axle splint nut to prevent loosening, which may cause engine damage.
Caution! Remove washer 4, included in the Mot tool kit, 1643, before installing the crankshaft pulley.