Attention: To install and remove the toothed belt, it is necessary to additionally remove the adjacent units: generator, servo pump, air conditioning compressor.
Withdrawal
After turning the steering wheel counterclockwise, hang out the engine, first place a wooden block under the oil sump.
Remove the top brackets (1), (2) engine.
Remove the alternator drive belt.
Loosen the water pump pulley by pressing lightly on the V-belt by hand to prevent the pulley from turning.
Unscrewing the bolt (1), remove the pulley (2) crankshaft.
Remove the flange (arrow).
Remove the top cover (1) toothed belt.
Turn the engine crankshaft clockwise until the camshaft reaches the TDC position of the 1st cylinder.
Align the mark on the camshaft gear with the TDC mark on the cylinder head. The engine is set to the TDC position of the first cylinder.
Remove the bottom cover (1) toothed belt.
Loosen the bolt (1) tension roller (A).
Note the direction of movement of the toothed belt, which moves clockwise.
Remove the toothed belt.
After releasing the set bolt, remove the bypass roller.
Remove the camshaft gear (if necessary).
Remove the crankshaft gear (if necessary).
Examination
Visually check the condition of the toothed belt. If any of the following defects are found, replace the belt.
Teeth are broken or cracked at the base
Possible causes of defects:
- jamming of the camshaft or distributor;
- crankshaft and/or camshaft oil seals are damaged.
The reverse side of the belt is badly worn or cracked
Possible causes of defects:
- jamming of the tension roller;
- engine overheating;
- belt hits the cover.
The side of the belt is worn out. The edges of the belt are rounded, the cord threads are disheveled and come out
Possible causes of defects:
- incorrect installation of the belt;
- the side surfaces of the idler roller are notched or heavily worn.
Tooth wear. The outer coating on the thrust surface of the teeth is worn off, the rubber layer under it is worn and has a whitish color
Possible causes of defects:
- poor sealing of the belt cover;
- leak in the water pump;
- incorrect operation of the camshaft;
- incorrect operation of the distributor;
- excessive belt tension.
Oil, coolant or water on the belt
Possible causes of defects:
- poor sealing in the glands;
- leak in the water pump;
- poor belt cover seal.
Check the tension roller for wear and damage.
Installation
Mounting marks (1) And (2) camshaft
Check the coincidence of the alignment marks of the camshaft and crankshaft in the position of the piston of the 1st cylinder at TDC.
Crankshaft alignment marks (3)
Install, if removed, the toothed belt tensioner.
Place the lower end of the spring against the front cover.
Fit the toothed belt in the sequence shown in the figure.
1 - crankshaft;
2 - bypass roller;
3 - camshaft gear;
4 - tension roller.
Turn the camshaft gear slightly clockwise. Unscrew the tensioner pulley pinch bolt and tension the toothed belt.
Check the TDC position of the crankshaft and camshafts of the engine. All marks and markings of the TDC with a tensioned toothed belt must match.
Establish the lower casing of a gear belt.
Attach the crankshaft pulley with the center bolt (1) with a tightening force of 150 Nm.
Attention: Do not forget to install a special washer (2).
Engage 1st gear.
Press the brake pedal.
Fasten the water pump pulley with 10 Nm.
Install the V-belt.
Attach the upper engine mount.
Caution: Some 16 valve engines have a hydraulic belt tensioner that maintains a constant amount of belt tension. Adjusting the tension of the toothed belt is carried out after removing and installing the toothed belt.