1 - the lower loose leaf of the crankshaft main bearing; 2 – the top loose leaf of the main bearing of a cranked shaft; 3 – the top bearing of a cranked shaft; 4 - crankshaft rotation angle sensor; 5 - crankshaft; 6 - lower bearing of the crankshaft; 7 – a cover of the main bearing of a cranked shaft; 8 - bolt, 55–60 Nm.
Withdrawal
1. Remove the timing belt, front cover, flywheel and oil pan.
2. Remove the rear cover from the cylinder block and the rear crankshaft O-ring.
3. Loosen the nuts and remove the connecting rod caps.
4. Turn out bolts and remove covers of radical bearings of a cranked shaft.
5. Remove the crank angle sensor rotor.
Warning! Mark the crankshaft main bearing caps in order to install them in their places and in the same position.
Examination
1. Check the crankshaft main and connecting rod bearing journals for wear and wear. Check crankshaft oil holes for blockage.
2. Using a micrometer, measure the diameters of the crankshaft journals in two diametrically opposite directions. In the presence of development or ovality, regrind the crankshaft. Regrinding the crankshaft journals only to the next repair size. If the crankshaft has been ground to +0.50 mm oversize, heat treat the crankshaft to increase its durability.
- Diameter of crankshaft journals: 50 mm
- Connecting rod diameter 45 mm
- Ovality and taper of the crankshaft journals: no more than 0.01 mm
Connecting rod and main bearing shells
Check the connecting rod and main bearings for localized corrosion, wear, or other damage. If necessary, replace the liners.
Measuring the clearance of main and connecting rod bearings
To measure the clearance of the main and connecting rod bearings, measure the diameters of the crankshaft journals and the corresponding inner diameters of the bearings. The clearance value is the difference between the inner diameter of the bearing and the corresponding diameter of the crankshaft journal.
- Crankshaft main bearing clearance: 0.028–0.045 mm
- Crankshaft connecting rod bearing clearance: 0.024–0.042 mm
Measuring main and connecting rod bearing clearance using Plastigage plastic caliper
1. Clean the main and connecting rod journals of the crankshaft from grease, and blow the lubrication holes with compressed air.
2. Install the main bearing shells to the engine block. Install the crankshaft onto the main bearing shells in the cylinder block. Install the remaining main bearing shells into the crankshaft main bearing caps. Position the lengths of the Plastigage plastic dipstick on the crankshaft main bearing journals.
3. Install the main bearing caps as marked. In a certain sequence, tighten the crankshaft main bearing cap bolts. Do not rotate the engine crankshaft when measuring the crankshaft main bearing clearance. Turn out bolts and remove covers of radical bearings of a cranked shaft. Using a measuring gauge, measure the width of the deformed Plastigage plastic rod and determine the gap.
If the clearance exceeds the maximum allowable value, regrind the crankshaft journals and use oversized repair liners.
Oil seal rings
Check the front and rear oil seals for damage or wear on the sealing lips. If there are any defects, replace the O-ring.
Crank angle sensor rotor
1. Remove the crank angle sensor rotor.
2. Check the crank angle sensor rotor for damage, cracks and wear and replace if necessary.
3. Check the clearance between the crank angle sensor rotor and the crank angle sensor.
- Gap between crank angle sensor rotor and crank angle sensor: 0.5 - 1.0 mm
Order of execution
Warning! Measure the installation depth of the sensor, i.e. the distance from the top of the crank angle sensor rotor teeth to the outside of the cover.
Calculate the difference between the length of the crank angle sensor and its installation depth.
Installation
1. Install the upper main bearing shells to the engine block. When reinstalling the earbuds, install them in the same places they were before removal.
2. Before installing the crankshaft, apply a thin film of clean engine oil to all sliding surfaces. Install the crankshaft onto the main bearing shells in the cylinder block.
3. Install the remaining main bearing shells into the crankshaft main bearing caps. Install the crankshaft main bearing caps as marked, with the arrow on each cap pointing towards the crankshaft pulley. In a certain sequence, in 2 or 3 stages, tighten the crankshaft main bearing cap bolts in the following order: center, No. 2, No. 4, front and rear.
Torque:
- Main bearing caps: 55–60 Nm
- Connecting rod bearing caps: 32–35 Nm
4. Rotate the crankshaft and check that it rotates easily and smoothly. Install the dial gauge tip on the front end of the crankshaft. Move the crankshaft along the axis until it stops and set the dial gauge to zero. Move the crankshaft along the axis to the other side until it stops and read the values of the axial play on the indicator scale.
Axial play of the crankshaft: 0.050–0.175 mm
5. Lubricate the outside of the new rear O-ring with engine oil. Using the special tool 09231-22000, install the o-ring until it stops in the rear cover slot.
6. Install the O-ring cover, gasket and tighten the 5 bolts. At installation grease working edges and an external surface of a sealing ring with pure engine oil.
7. Install the rear cover and secure it with screws.
8. Install the connecting rod caps.
9. Install the flywheel, front cover, oil pan and toothed belt.