Nissan:: Sunny:: Check of the crankshaft

3.1.2.9.2. Check of the crankshaft

Check of an axial side play

PERFORMANCE ORDER

1. The axial side play is checked before removal of the crankshaft from the engine and can freely rotate in radical bearings.
	2. The axial side play is checked by means of the arrow indicator. 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

PERFORMANCE ORDER

1. Wash out the crankshaft solvent and dry. Carefully clean lubricant channels in the crankshaft.

2. Check existence on conrod necks of traces of uneven wear, cracks, zadir and pitting (poles).

3. Wear of a conrod neck is followed by distinct metal knock on the working engine (it is especially well listened when pressing a pedal of a butterfly valve at the movement with a small speed) and noticeable pressure drop of oil.

4. 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.

5. Check a roughness of necks of the crankshaft, having run over them a finger. Any roughness (which is shown along with strong indications of wear of radical and conrod bearings) indicates regrindings of necks of the crankshaft or its replacement the need.

6. Check a crankshaft beating in the central part, having installed the crankshaft in prismatic support. If the beating exceeds norm, then the crankshaft needs to be replaced.

7. If necks of the crankshaft pereshlifovyvatsya, then remove agnails around lubricant openings.

8. Measure diameter of radical and conrod necks and compare results to standard. 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.

9. Check a condition of the condensed crankshaft necks. 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.

10. Two repair sizes for radical bearings (with reduction of diameter by 0,25 and on 0,5 mm) and three repair sizes for conrod bearings (0,08, 0,12 and 0,25 mm) are provided. 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 repaired crankshaft and to install repair bearings. About volume what actions to undertake further consult in service of car service or of the expert.