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3.2.2.8.1. Removal and check of a condition of the crankshaft

Removal

PERFORMANCE ORDER
1. Remove the oil pallet, a chain (or chains) and a flywheel.
2. Remove rods with pistons.
Prevention

If with pistons and rods no repair work is performed, then to remove a head of cylinders and conrod and piston group there is no need. Pistons should be pushed only towards combustion chambers to remove on sufficient distance from crankshaft support.
3. Check an axial side play of the crankshaft then execute the following operations.
Engine of 2,0 l
4. Turn off bolts and remove the left side (from a flywheel) the block of cylinders the holder of a back epiploon. When weakening of the directing pins remove them and you store together with the holder.
5. Turn off bolts of fastening of covers of radical bearings, doing 1 turn for reception. After an otvorachivaniye of bolts get them from the block of cylinders.
6. Remove a cast framework from covers of radical bearings, having paid attention to its orientation.
7. Covers of radical bearings have to be numbered from 1 to 5, since a gas distribution mechanism chain cover (the arrangement of a numaration is specified by shooters). If numbers are absent, then put with white paint of a tag which correspond to serial number of a cover and define its orientation to exclude the wrong installation of a cover at assembly.
8. Uncover and get the lower inserts of radical bearings. Paste a tape each insert to the corresponding cover to exclude loss or the wrong installation of inserts.
9. Carefully get the crankshaft, at the same time the shift of the top inserts of radical bearings is not allowed.
10. Get the top radical inserts from the block of cylinders. Paste a tape each insert to the corresponding cover to exclude loss or the wrong installation of inserts. Get persistent half rings from an average support of the crankshaft (N3) and you store together a cover of the average radical bearing.

Check of a state

PERFORMANCE ORDER
Check of an axial side play
1. The axial side play is checked before removal of the crankshaft from the engine and can freely move in radical bearings (see subsection 3.2.2.11).
2. The axial side play is checked by means of the arrow indicator which rests against a crankshaft end face. Displace the crankshaft to the full aside and establish an indicator scale on zero. Displace the crankshaft to the opposite side and consider the indication of the indicator. Compare result to standard. If the side play exceeds norm, then replacement of persistent half rings is required.
3. In the absence of the indicator the axial side play can be checked the probe. Displace the crankshaft to the full towards a flywheel, then measure a side play, inserting probes into a gap between a crankshaft cheek about the 4th conrod neck and a persistent half ring near the 3rd radical bearing.
Check of a state
4. Wash out the crankshaft kerosene or solvent and dry a stream of compressed air (if is available). Carefully clean the brush lubricant channels in the crankshaft.
5. Check existence on conrod necks of traces of uneven wear, cracks, zadir and pitting (poles).
6. Uneven wear of a conrod neck is followed by distinct metal knock on the working engine (which is especially well wiretapped when pressing a pedal of a butterfly valve during the movement with a small speed) and noticeable pressure drop of oil.
7. Wear of radical bearings is followed by strong vibration of the engine and the deaf roaring sound which accrues with increase in turns of the engine, and also noticeable pressure drop of oil.
8. Check a roughness of necks of the crankshaft, having run over them a finger, strongly without pressing. Any roughness (which is shown along with strong indications of wear of radical and conrod bearings) indicates the need regrindings of necks of the crankshaft (if it is possible) or its replacement.
9. Check a crankshaft beating in the central part by means of the arrow indicator, having installed the crankshaft in prismatic support. If the beating exceeds norm, then the crankshaft needs to be replaced.
10. If necks of the crankshaft pereshlifovyvatsya, then remove agnails around lubricant openings (these openings usually razzenkovyvatsya slightly therefore agnails meet only in case of negligent performance of grinding works). Agnails are removed a small file or a shaber, upon termination of carefully clear openings.
11. Measure by a micrometer diameter radical (a photo at the left) and conrod (a photo on the right) necks and compare results with standard of the section (see subsection 3.2.1.1). Define ovality of necks for what measure diameter in several points on a neck circle. Check conicity, having measured diameter about opposite cheeks of necks. Compare the received results to standard.
12. Check a condition of the necks of the crankshaft condensed by epiploons. If on these necks there is a deep flute formed in the place of working edges of an epiploon, then consult at the expert as either repair or replacement of the crankshaft will be required.
13. The manufacturer delivers repair radical and conrod bearings in the spare part. For inserts of radical bearings only one repair size (0,25 mm) and three repair sizes for conrod bearings (0,08, 0,12 and 0,25 mm) is provided. Concerning acquisition of repair radical and connecting rods address to service of car service of the dealer of Nissan.

14. If on sale there are repair inserts, and wear of necks of the crankshaft exceeds standard so that further repair is impossible, then it is expedient to buy the restored crankshaft and to install repair bearings. About volume what actions to undertake further consult in service of car service or of the expert.