Withdrawal
Remove the toothed belt, cylinder heads, drive plate, transmission mounting plate, oil sump and oil pump housing.
Examination
Cylinder block
1. Visually inspect the cylinder block for scoring and rust.
Also check for cracks and other defects. In the presence of defects repair or replace the block of cylinders.
2. Using the indicator, measure the cylinder diameter at three levels in directions A and B.
- Level 1. The location of the No. 1 piston ring when the piston is at top dead center.
- Level 2. Center of the cylinder.
- Level 3. Lower part of the cylinder.
Cylinder boring
1. The oversized pistons used should be determined based on the largest diameter cylinder
Size | Identification label |
0.25mmOS | 0,25 |
0.50 mmOS | 0,50 |
0.75mmOS | 0,75 |
1.00mmOS | 1,00 |
OS - Increased Size
Note. The dimension mark is on the piston head.
2. Measure the outside diameter of the used ones.
3. Based on the results of measuring the outer diameter of the piston, calculate the diameter of the cylinder after machining.
Cylinder diameter after boring = Piston outside diameter + (0,02-0,04) mm (gap between piston and cylinder) - 0.2 mm (allowable honing limit)
4. Rebore each cylinder to the calculated size.
Warning. To prevent deformation of the cylinder block due to an increase in temperature during honing, bore the cylinders in the sequence corresponding to the order of their operation.
5. After honing the cylinders, bring them to the required size (piston outer diameter + clearance between piston and cylinder).
6. Check up size of a backlash between the piston and the cylinder.
- Nominal value - 0.02-0.04 mm
Note. When boring cylinders, bring all cylinders to the same size. Do not bore only one cylinder to a larger size.
Installation
Install the following parts using the instructions in the relevant sections.
- 1) Crankshaft.
- 2) Drive plate.
- 3) Pistons.
- 4) Cylinder heads.
- 5) Toothed belt.
- 6) Oil pump housing.