Removal and installation the timing belt of B3, B5, B6, BP engines (SOHC) (Mazda Familia BG)

Caution! For removal of the toothed belt of a diesel engine, see Chapter Diesel engine.

Removal

1. Disconnect the ground cable from the battery.

Warning! This will erase the engine fault memory or the radio security code. Before disconnecting the battery, read the instructions in Section Removal and installation the battery.

2. Raise the vehicle and remove the right front wheel.

3. Remove the lower engine shield in the right wheel well.

4. If equipped, remove the V-belt of the servo pump and air conditioning compressor, see Section Removal and installation/tensioning the V-belt.

5. Loosen the water pump belt pulley mounting bolts.



6. Remove the alternator V-belt, see Section Removal and installation/tensioning the V-belt.

7. Loosen the water pump belt pulley mounting bolts and remove the pulley.

Up to 2/91 issue.

1. Block the crankshaft and unscrew the crankshaft belt pulley mounting bolts.

2. To lock the crankshaft, engage 5th gear and ask an assistant to press the brake pedal.

3. Remove the washer, crankshaft belt pulley, outer and inner toothed belt guide discs.

Since 3/91 issue.

1. Unscrew the crankshaft belt pulley mounting bolts. Hold the belt pulley neck with a special device MAZDA SST 490011102.

2. Unscrew the upper and lower timing belt covers.



3. Disconnect the spark plug caps and remove the spark plugs, see Chapter Maintenance.

4. Set the piston of the 1st cylinder to the ignition position. To do this, turn the crankshaft so that the marks on the camshaft pulley coincide with the marks on the timing cover and cylinder head. At the same time, the marks on the cylinder block and on the crankshaft gear must coincide.

5. To turn the crankshaft, engage 5th gear and move the car on a level surface. Another way to turn the crankshaft: Raise the front wheel, engage 5th gear and turn the wheel by hand.

Attention! After the piston of the 1st cylinder is in the ignition position, set the gearbox to neutral and check again whether the marks on the crankshaft belt pulley and the timing gear cover match. If the marks match, do not turn the crankshaft any further.

6. If the old timing belt is to be reinstalled, it should be marked. An arrow indicating the direction of rotation should be applied to the belt. The crankshaft rotates clockwise.



7. Loosen the tension roller bolt and press the tension roller in the direction of the arrow until the toothed belt is loosened. Tighten the tension roller bolt again.

8. Remove the toothed belt, after this do not change the position of the toothed wheels.

Installation

Caution! Do not bend or twist the toothed belt. Replace a dirty, damaged or worn toothed belt in any case. Check the evenness and ease of movement of the tension roller.

Caution! If the camshaft is turned with the timing belt removed, none of the pistons should be in the BMT position. Otherwise, serious damage to the pistons and valves may occur. If the crankshaft needs to be turned, all pistons should first be set to half height. To do this, draw a chalk line on the top of the crankshaft gear (condition: the crankshaft is in the BMT position of the piston of the 1st cylinder), then turn the crankshaft wheel 1/2 turn to the left or right. The chalk mark is in a horizontal position.

1. Make sure that the camshaft is in the position corresponding to TDC of the 1st cylinder. In this case, the marks on the camshaft wheel and on the timing gear cover and cylinder head must match.



2. At the same time, the mark on the crankshaft gear should coincide with the mark on the cylinder block. Then the piston of the 1st cylinder is in the TDC position.



3. Apply the toothed belt so that the pulling side is taut. If you are installing an old belt, pay attention to its direction of rotation.

Attention! When installing the timing belt, the position of the camshaft and crankshaft must not change. Otherwise, serious malfunctions may occur in the engine, or the engine will not develop its maximum power.

4. Loosen the tension roller bolt so that the roller fits against the belt.

5. Turn the crankshaft twice in the direction of rotation and check the alignment of the marks again; repeat the adjustment if necessary.

6. Tighten the tension roller mounting bolt with force 20 Nm.

7. Turn the crankshaft twice in the direction of rotation and check the adjustment again.



8. Check the tension of the toothed belt. The toothed belt at its longest section should deflect by 11-13 mm when pressed with a force of 10 kg, which corresponds to pressing with the thumb. If the value does not correspond to the required value, loosen the tension roller and tighten it again.

9. Screw the upper and lower toothed belt covers on with force 10 Nm.

10. Install the outer and inner toothed belt guide discs according to the recesses on the crankshaft wheel. Take into account the installation position.

Up to 2/91 issue.

1. Install the crankshaft belt pulley and washer "5" and tighten the mounting bolts with force 15 Nm.

Since 3/91 issue.

1. Install the crankshaft belt pulley mounting bolt. Hold the pulley neck with the special tool MAZDA SST 49 D 011102 and tighten the bolt with force 165 Nm.

2. Install the water pump belt pulley and tighten the mounting bolts with hand force.

3. Install the V-belt, see Section Removal and installation/tensioning the V-belt.

4. Tighten the water pump belt pulley with force 10 Nm.

5. Install the spark plugs and connect the cables, see Chapter Maintenance.

6. Screw the shield into the right wheel well.

7. Install the front wheel and lower the vehicle.

8. Connect the ground cable to the battery.

Data provided by the website Mazbook.ru

9. If available, set the time on the clock and set the security code for the radio receiver.

10. Check the ignition timing, adjust if necessary, see Chapter Ignition system, Chapter Checking/adjusting ignition timing.