Note: Do not use caustic soda to clean the aluminum alloy cylinder block.
Caution: When washing the unit in a heat bath, do not exceed a temperature of 230°C.
Remove all dirt from the block surfaces using solvent or a heat bath. Pay special attention to cleanliness:
- surfaces for installing gaskets;
- channels for the passage of liquid;
- oil channels;
- main bearing caps;
- threaded holes.
To clean threaded holes, you can use taps of the appropriate size.
1. Check:
- condition of cylinder walls, look for excessive scratches, scuff marks or annular wear ridge in the stop zone of the upper compression ring;
- condition of the cooling jacket, look for cracks;
- condition of the block jumpers for installing the main bearing caps, look for cracks;
- condition of surfaces for installation of gaskets, seals, O-rings, look for scratches, traces of burns and other defects;
- condition of the threads of the threaded holes.
2. Measure the cylinder diameter to decide whether to go to the next oversize, see specification.
Take measurements in two mutually perpendicular planes and in three places along the height of the cylinder (BDC, TDC, middle of piston stroke). Based on the measurement results, determine the degree of wear, taper and ovality of the cylinders. If the diameter, taper and ovality are outside the tolerance limits in at least one cylinder, bore and hone all cylinders.
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