Withdrawal
1. Remove the timing belt drive gears, front cover, flywheel cylinder head and oil pan (instructions are given in the relevant sections).
2. Remove the rear plate and rear oil seal.
3. Remove the connecting rod caps.
Note. Mark the crankshaft main bearing caps to reinstall them in the correct position.
4. Remove the main bearing caps and crankshaft. Arrange the liners according to the bearing cap numbers.
Examination
Crankshaft
1. Check the crankshaft main and connecting rod journals for damage, wear and cracks. Also check if the holes are clogged. Correct or replace any defective parts.
2. Check the crankshaft journals for roundness and taper. Visually inspect each bearing for delamination, melted areas, nicks, etc. Replace defective bearings.
Oil clearance measurement
Check the oil clearances by measuring the outer diameter of the crankshaft main and connecting rod journals and the inner diameter of the bearings. The gap is obtained by determining the difference between the measured inner and outer diameters.
Rated value | |
Oil clearance | |
Main bearing shells | 0.02-0.05 mm |
Connecting rod bearing shells | 0.02-0.05 mm |
limit value | 0.1 mm |
Plastic Template Use Method
You can use a plastic template to measure the gaps.
1. Remove oil, dirt and grease from bearings and crankshaft journals.
2. Cut a piece of plastic equal to the width of the liner and place it along the axis of the neck away from the oil holes.
3. Install the crankshaft, liners and bearing caps and tighten them to the required torque. Do not rotate the crankshaft during this operation. Remove bearing caps. Using the scale printed on the template package, measure the thickness of the template. If the gap exceeds the allowable value, the liner must be replaced. When installing a new crankshaft, use liners of nominal size.
Stuffing box
Check the front and rear oil seals for damage and rib wear. Replace defective oil seal.
Main bearing caps
After installing the main bearing caps, make sure that the crankshaft rotates easily and its end play is within acceptable limits. If the play limit is exceeded, replace the crankshaft bearing.
- Nominal value - 0.05-0.18 mm
- Limit value - 0.25 mm
Flywheel
1. Check the surface of the flywheel that interacts with the clutch disc for damage and wear.
Replace excessively worn or damaged flywheel.
2. Check up beating of a surface of a flywheel interacting with a disk of coupling.
- Limit value: Flywheel runout - 0.13 mm
3. Check the flywheel ring gear for damage, cracks and wear and replace if necessary.
Installation
1. Install the grooved main bearing (top liner) in the bed of the cylinder block.
2. Install main bearing without groove (bottom liner) in bed bearing caps.
3. The upper and lower center main bearing shells are not grooved.
4. Install the crankshaft. Apply engine oil to his necks.
5. Bearing caps should be installed with the arrow pointing towards the front of the engine. Cap numbers must be correct.
6. Tighten the cover bolts to the required torque in the following sequence: central; No. 2; No. 4; front and back.
- Tightening torque: Main bearing cap bolts - 130-140 Nm
7. Before tightening the required tightening torque, the cap bolts should be tightened evenly in 4-5 steps.
8. Make sure the crankshaft rotates easily and has adequate end play.
9. Using the special tool, install the oil seal into its housing.
10. Install the oil separator into the stuffing box with the oil hole in the oil separator pointing down (arrow in the picture).
11. Install a new packing box gasket and packing box.
12. Attach the rear plate to the cylinder block.
13. Establish a flywheel and tighten bolts of its fastening the demanded moment.