Cylinder block and parts screwed to it
1 Bearing shell in block (with oil groove)
2 Gasket
3 Front sealing flange
4 Bolt
5 Oil seal
6 Bolt, 25 Nm
7 Stuffing box flange
8 O-ring
9 Key
10 Intermediate shaft
11 Bolt, 10 Nm
12 Crankshaft oil seal
13 Adjusting washer in the block
14 Engine intermediate plate
15 Rear oil seal flange
16 Rear oil seal
17 Bolt, 10 Nm
18 Gasket
19 Support for bearing #3
Cylinder bores must be carefully checked. By running the tip of your finger along the top and bottom sides of the hole, wear can be determined, which appears as "steps", if the piston does not move along the entire bore, and therefore wear occurs. This is an indication of that. that needs to be drilled. There are pistons of repair sizes.
In order to measure the piston clearances, you need to measure the piston diameters and record the diameters of all pistons along with the cylinder numbers. Here you have to use a micrometer. If you cannot fully rely on your skill, ask a workshop to have the measurement taken.
To determine the gaps, it is now necessary to measure the diameters of the cylinder bores as follows:
Using a dial gauge, measure the hole diameters at a distance of 10 mm from the top edge of the hole and then at a distance of 10 mm from the bottom edge of the hole. To work with a pointer meter, you need to have some experience. The dial gauge is inserted into the hole. If you shake the meter from left to right and back, the meter needle will also move from left to right and back again. The important thing is the average value of the movement of the needle, which gives the exact diameter. It is necessary to measure in the longitudinal and transverse direction.
Numbers 1, 2 and 3 indicate the measurement locations inside the hole. Letters (A) And (IN) indicate in which direction measurements should be taken. The graph shows the normal wear curve, denoted by the letter "A" and the premature wear curve, indicated (1).
Take another measurement in the middle.
Carry out the above measurements in the longitudinal direction of the cylinder block and then again at the same depths in the transverse direction of the block. All six values obtained should be recorded. The difference between the measured values above and below gives the amount of narrowing. The difference between the measured values in the longitudinal and transverse directions gives the difference from the circumference. In no place should the diameter differ from the nominal value by more than 0.08 mm.
There are several piston oversizes for each type of engine, and the cylinder block can be bored to the next size.
The surface of the cylinder block should be checked for warping. The block should be measured in the longitudinal, transverse and diagonal directions. In this case, it should not be possible to push in a probe with a thickness of more than 0.10 mm. Before taking measurements, make sure that the surfaces of the cylinder block are thoroughly cleaned and that foreign bodies do not get between the ruler and the surface of the cylinder block.
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