4.2.12. Cleaning and survey of the block of cylinders / case of the crankshaft


During the work with compressed air use goggles.


1. Remove external components and electric switches / sensors from the block. For full cleaning, ideally, also hollow caps have to be removed. Caps are removed as follows. Drill a small opening in a cap, then insert into it the self-tapping screw. Take traffic jams, having grasped self-tapping screws with flat-nose pliers or pincers. Also to an otboltita from the crankshaft of 4 oil nozzles (on B204/B234 engines).
2. Scratch out all traces of old sealant from the block of cylinders / case - be careful, do not damage pro-masonry / sealing surfaces.
3. Remove caps of oil galleries (where are established). Caps usually sit very densely - as a last resort caps can be drilled, and carvings in openings are restored by a tap. At assembly of the engine establish new caps.
4. In case of strong pollution of the block of cylinders / case it is necessary to subject it to steam cleaning.
5. Clean all oil openings and oil galleries and wash out internal cavities warm water - continue washing until clear water goes. Carefully dry and, in order to avoid a rzhavleniye, grease with a thin film of oil all interfaced surfaces. Grease also mirrors of cylinders. In case of existence of access to compressed air use it for drying process acceleration, blow also compressed air all oil openings and galleries.
6. In case the block of cylinders is polluted not really strongly, normal cleaning can be carried out by means of hot (so on how many you can bear), soap water and a rigid brush. Do not feel sorry for time and work for carrying out this work. Irrespective of the chosen method of carrying out cleaning, make sure of care of cleaning of all oil openings and galleries, and also of care of drying of all components. In conclusion make protection of mirrors of cylinders against corrosion as it is described above.
7. For ensuring correctness of effort of tightening of threaded connections all carving openings have to be smoothed out by means of taps. For cleaning of carvings insert a tap of the required size into an opening and remove traces of a rust, corrosion, sealant for fixing of carvings or pollution; also it will help to correct a situation at violation of a carving. If there is an opportunity, use compressed air for cleaning of carving openings of the shaving formed during a procedure of cleaning. Injection aerosols of water disperse lubricant in each opening through the long tubule which is usually enclosed complete with аэрозолью will be a good alternative.

8. Apply suitable sealant on new caps of oil galleries and insert caps into an opening in the block of cylinders. Strong tighten caps. Establish and tighten oil nozzles in the lower part of a case on B204/B234 engines.
9. If the engine is not subject to immediate dismantling, for maintenance it in purity cover the engine with a big plastic casing; in order to avoid formation of a rust make protection of all interfaced surfaces and mirrors of cylinders in the way described above.

At a clearing of openings use goggles.



1. Visually examine the block of cylinders regarding detection of cracks and corrosion. Check whether a thread in carving openings is stripped. If there were cases of internal leak of water, it makes sense to carry out a professional inspection of the block of cylinders / case in the workshop having the special equipment. In case of detection of defects try to eliminate them; in case of impossibility acquisition of the new block of cylinders will be required.
2. Check a mirror of each cylinder for wear or existence of scratches. Check whether is available in the top part of cylinders of the worked edges (steps) indicating excessive wear of a mirror of cylinders.

3. Pistons and cylinders are adjusted to each other and classified by five codes - AB, B, C, 1 (with excess in 0.5 mm) and 2 (with excess of 1 mm).
4. The code is stamped on the piston bottom.

5. And also the code is stamped on a forward part of the block of cylinders. Pay attention that all classifications can appear in the same block of cylinders.

6. Wear of mirrors of cylinders and pistons can be measured by installation of the corresponding piston (without piston rings) in the cylinder and introduction of an edge of the shchupovy measuring instrument there. You make check at the piston, established as it is possible closer to cylinder top. If the gap exceeds nominal (for the new piston of the engine) the value given in Specifications it is necessary to make boring of cylinders, at the same time it is better to take a professional advice on restoration of the engine.