Table 1.5
D7F engine
1. Remove retainer Mot. 1054
2. Install the extension sleeve of tool Mot. 1386 and tighten the crankshaft sprocket bolt.
Pic. 1.8a
3. Install gauge Mot 1273 and use tool Mot. 1135-01 turn the idler * roller counterclockwise until you get the value 20 US (turn the handwheel of the sensor until it triggers (three clicks).
Pic. 1.8b
4. Tighten the tension roller mounting nut.
5. Turn at least two revolutions of the engine crankshaft (without allowing reverse rotation).
6. Block the crankshaft of the retainer in the position corresponding to the presence of the piston of the first cylinder at TDC, then remove it! retainer.
7. Check the correct installation of the gas distribution mechanism by aligning the marks on the gear pulleys of the camshafts with the alignment marks, respectively, on the cylinder head cover and the front cover of the cylinder block.
8. Loosen the tensioner pulley nut and turn the idler pulley slightly using tool Mot. 1135-01 clockwise until both holes on the idler pulley are almost horizontal.
9. Tighten the tension roller axle nut.
10. Turn the crankshaft at least two turns (without allowing rotation in the opposite direction).
11. Block the crankshaft with a clamp in the position corresponding to the presence of the piston of the first cylinder at TDC, then remove the clamp.
12. Using tool Mot. 1386 Preload 10 Nm of the belt on the branch between the crankshaft sprocket and the coolant pump pulley.
Pic. 1.8v
13. Install gauge Mot. 1273 and measure the tension, which should be within 20±3 US (installation tension); if the value is different, correct by repositioning the tensioning roller with tool Mot. 1135-01, and repeat the tensioning procedure of steps 10-12.
14. Tighten the nut of the tension roller axle with a torque of 50 Nm.
Note. After each change in the position of the tension roller, rotate the crankshaft at least two revolutions in order to be able to measure the tension.
15. Preload the belt with 1 Nm to eliminate belt deflection.
E7J engine
1 Let the engine cool down to ambient temperature.
2. Fit the measuring unit Mot. 1273.
Pic. 1.9
3. Turn the control knob of the pressure device to the third click, thereby preparing the device for operation.
4. Tighten the belt until Mot. 1273 setpoint.
5. Block the tensioner, carry out a control check, bring the tension to the required value.
6. Rotate the crankshaft three turns.
7. Make sure the tension is within tolerances (±10%), otherwise readjust.
8. Tighten the nut of the tension roller axle with a torque of 50 Nm.
F8Q engine
Pic. 1.10
On the F8Q engine, before fitting the gauge block Mot. 1273, remove the TDC locking pin Mot 1054 and press firmly on the belt in the area between the countershaft pulley and the idler pulley, then measure.