Contents: Setting the valve timing 🠛 Installing the belt 🠛 Belt tension 🠛 Checking the timing belt tension 🠛 Checking the valve timing 🠛
Note: There are two ways to set the valve timing.
The first procedure is used to replace components located at the front of the timing mechanism, without the need to remove the sprinkling parts of one or both camshaft toothed pulleys.
Setting the valve timing
Caution! Be sure to degrease the nose and bore of the crankshaft toothed pulley and the bearing surfaces of the crankshaft pulley to avoid slipping of the toothed belt on the crankshaft toothed pulley, which may result in engine failure.
Position the camshaft grooves using tool Mot. 799-01 as shown in the figure.
Fix the Mot. 1496 tool to the ends of the camshafts.
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Make sure the crankshaft is securely locked at top dead centre with the pin Mot. 1489 (groove 5 of the crankshaft must be directed upwards).
Installing the belt
When replacing the timing belt, be sure to replace the timing belt tensioner and idler rollers.
When installing the tension roller, make sure that the roller protrusion fits properly into groove A.
Install:
- gas distribution mechanism drive belt;
- idler pulley, tightening the sprinkling bolt using tool Mot. 1368 to a torque of 45 Nm.
Belt tension
Move the movable pointer (A1) of the tension roller by 7-8 mm in relation to the fixed pointer 7 using a 6 mm Allen key (hole B).
Note: Position A corresponds to the initial position of the movable pointer.
Pre-tighten the tension roller axle nut to 7 Nm.
Install the crankshaft pulley so that the bolt is on the pulley and does not contact it (the gap between the bolt and the pulley should be 2-3 mm).
Note: The crankshaft pulley splinter bolt is reusable if the bolt length to the head is greater than 49.1 mm (otherwise replace the bolt).
Do not lubricate a new bolt with engine oil. On the contrary, a reused bolt must be lubricated with engine oil.
Tighten the crankshaft pulley splinter bolt to 20 Nm, then turn it further by 135°±16° (in this case the crankshaft must be locked with the top dead center lock).
Remove tool Mot. 1496 for locking camshafts and top dead centre lock Mot. 1489.
Turn the crankshaft two revolutions clockwise (if you look from the timing drive side) before completing the rotation, screw in the Mot. 1489 locking tool into the cylinder block and slowly, without jerking, move the crankshaft until it rests on the locking tool.
Remove the top dead center lock.
Loosen the tension roller axle nut no more than one turn while holding the roller with a 6 mm Allen key.
Align the movable pointer with the fixed pointer and finally tighten the nut to a torque of 27 Nm.
Checking the timing belt tension
Turn the crankshaft two revolutions clockwise (if you look from the timing drive side) before completing the rotation, screw the Mot. 1489 locking tool into the cylinder block and slowly, without jerking, move the crankshaft until it rests on the locking tool.
Remove the top dead center lock.
Make sure the tension roller indicators are aligned, otherwise repeat the tensioning procedure.
Checking the valve timing
Before checking the valve timing, make sure that the tension roller indicators are in the correct position.
Screw the Mot. 1469 locking tool into the cylinder block, then slowly and smoothly move the crankshaft until it rests on the locking tool.
Install (without any effort) mot 1496 camshaft locking tool (the camshaft grooves must be in a horizontal position). If the device cannot be installed, it is necessary to re-set the valve timing and adjust the timing belt tension.