Checking the condition and repairing the cylinder block (Hyundai Accent MC)

1. Using a scraper, remove any remaining gasket from the cylinder block surface.

2. Clean the cylinder block with a soft brush and solvent.

3. Using a metal ruler and a set of flat feeler gauges, measure the deviation from the plane of the cylinder block surface. Nominal value: less than 0.05 mm.



4. Check the cylinder bore for vertical scratches. If there are deep scratches, replace the cylinder block.

5. Using a bore gauge, measure the cylinder diameter at three levels in the longitudinal and transverse directions.

Nominal value:

• 76.50-76.53 mm (1.6 l);
• 75.50-75.53 mm (1.4 l).

6. Check that the cylinder size marking matches the measured value.

Marking of the cylinder diameter size group

Size group marking	Cylinder diameter, mm	Insert thickness, mm
	1.4L	1.6L
A	75,50-75,51	76,50-76,51
IN	75,51-75,52	76,51-76,52
WITH	75,52-75,53	76,52-76,53

7. Check the piston diameter marking (A) on the piston crown.

Marking of the piston diameter size group

Size group marking	Piston outer diameter, mm	Insert thickness, mm
	1.4L	1.6L
A	75,47-75,48	76,47-76,48
IN	75,48-75,49	76,48-76,49
WITH	75,49-75,50	76,49-76,50

8. Select pistons so that the clearance between the piston and the cylinder corresponds to the nominal value. Nominal value: 0.02-0.04 mm.

Cylinder block boring

9. Check the cylinder block for cracks, corrosion and other defects. Otherwise, replace the cylinder block.



10. In case of ovality, unacceptable taper or wear, the cylinders must be bored with subsequent honing of the mirror. The block boring must be performed according to the diameter of the repair pistons and for all cylinders.

Note: pistons are supplied in two repair sizes: 0.25 mm and 0.5 mm.

11. Before boring the block, ensure the required clearance between the piston and the cylinder and make sure that all pistons are of the same repair size. Nominal clearance value: 0.02-0.04 mm.