Contents: Removal the flange ⇊ Disassembly ⇊ Visual inspection of the block ⇊ Checking the alignment of the main…⇊ Checking the deformation of the…⇊
Removal the flange
A flange is formed on the cylinder wall as a result of wear and prevents the piston and connecting rod from being removed. The flange is removed using a special reamer. In this case, set the piston to BDC.
Disassembly
Remove all belts, sprockets (gears), shafts, oil level indicator pipe and other parts from the engine, remove the flange on the cylinder walls. Place the engine on the stand with the crankshaft facing up. Mark the connecting rods and crankshaft main bearing caps with a punch or stamp according to their cylinder assignment (cylinder N1 is located near the front of the engine). Install the engine so that the connecting rods and piston are accessible. Unscrew the nuts, remove the connecting rod cover and the bearing shell. Place the rubber hoses on the bolts and gently push the connecting rod with the piston through a wooden spacer by about 25 mm using light hammer blows. Remove the second connecting rod bearing, push the connecting rod with the piston and remove it from the cylinder. Install the liners and cover, hand tighten.
Repeat the procedure for the remaining cylinders. When disassembling a V-engine, first remove all pistons with connecting rods on one side, then on the other. Evenly loosen the nuts (bolts) of the main bearing caps, remove the caps and remove the crankshaft. Clean all removed parts.
Visual inspection of the block
Check the condition of the cylinder block for cracks. If the engine overheated, or there was an increased consumption of coolant or oil, it is recommended to check the cylinder block for microcracks in a car service using Magnaflux methods (magnetic flaw detection technique for cast iron blocks), or Zyglo (technique of spraying fluorescent composition for aluminum alloy blocks).
Checking the alignment of the main bearing beds
Check the condition of the main bearings. If the bearings are badly damaged or there are signs of bearing rotation, the alignment of the main bearing beds should be checked. Place the gauge on the surface of the beds. If there is a gap between the bearing seat and the gauge, the bearings should be centered. This is ensured by processing the beds by pulling with the main bearing caps installed.
Checking the deformation of the cylinder block split plane
The deformation of the cylinder block split plane is checked after thorough cleaning with a gauge and feeler gauge diagonally and along the block surface along the center line. If the deviation from the plane exceeds 0.076 mm over a 152 mm section, or 0.152 mm over the entire length of the head, the cylinder block plane should be reground.