Cylinder block — cleaning and checking

When completely disassembling the cylinder block, carefully clean and remove foreign particles from the cavities and oil channels. Completely remove any remaining cleaning fluids. Pay special attention to this. If possible, blow out the cylinder block with dry air.

To determine the clearance between the piston and the cylinder, measure the diameter of the pistons. For engines of all types, this is done at the bottom of the piston skirt. Write down the obtained values. The cylinder diameters are then measured as described below. To do this, use a caliper:

1. Measure the cylinder diameter at a height of 10 mm from the top edge and 10 mm from the bottom edge.

2. Additionally, measure the diameter at half the height of the cylinder.

3. The above measurements are taken in the direction of the longitudinal and transverse axes of the cylinder block. Thus, six measurements are made for each cylinder. The difference between the upper and lower measurements is the taper, the difference between the diameters in the longitudinal and transverse directions is the ovality of the piston. Any of the obtained diameters must not be less than that given in Specifications. There are several repair sizes of pistons. The cylinder block can be bored accordingly. The mating surface of the cylinder block must be checked for flatness in the same way as it is done for the cylinder head. The surface is checked in longitudinal, transverse and diagonal directions. Maximum flatness - no more than 0.10 mm.