Cleaning
1. Remove all attachments from the cylinder block, unscrew the sensors. Take out the plugs, for which drill holes in the plugs, into which you screw in a self-tapping screw and remove with pliers by the screw heads.
2. Carefully clear the block of cylinders of the remains of material of linings.
3. Remove all oil channel plugs (if provided). These plugs are wrapped very tightly, so they may need to be drilled out and then driven through with a tap. When assembling the engine, replace all plugs.
4. If the cylinder block is heavily soiled, steam cleaning will be required.
5. After steaming the block, repeat the cleaning of the oil holes and channels. Flush all internal passages of the cylinder block with warm water until clean water begins to drain. Dry the block thoroughly and lubricate all split and ground surfaces to prevent corrosion.
6. If the surface of the cylinder block is moderately contaminated, then you can limit yourself to washing the cylinder block with hot soapy water.
7. Clean the threaded holes and drive the threads with a tap.
8. Lubricate new plugs with sealant and screw into the cylinder block.
9. If the engine assembly is delayed, lubricate the planes of the cylinder block and cover the entire block with plastic wrap.
Examination
10. Visually check up existence on the block of cylinders of cracks and traces of corrosion. Check the condition of the threads in the holes, mark the places with stripped threads. If there was a suspicion of a coolant leak inside the cylinder block, then the block must be tested for leaks, for which you should contact the workshop. If defects are found, repair the unit (if possible), or replace.
11. Check up presence of chips and scuffs on internal surfaces of cylinders.
Check for a shoulder on the top of the cylinder, which indicates excessive wear on the cylinder.
12. Measure the bore of the cylinder just below the wear shoulder, parallel and perpendicular to the engine axis. Repeat measurements in the middle of the cylinder and on the bottom edge. Based on these six measurements, determine the taper and ovality of the cylinder. Compare results with normative (the designation of the size group of cylinders is stamped on the cylinder block). If the measured values exceed the limit, then the block should be bored and repair pistons installed (or replace and install new pistons). In case of severe damage to the cylinders, replace the block.
13. If the condition of the cylinders is satisfactory, then only the piston rings will need to be replaced. In this case, the cylinders are only honed, which ensures better running-in of the piston rings and their tight fit to the cylinder walls (carried out at a service station).
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