Department of automobile engineering


Figure 11 CHECKING OF CRANKSHAFT



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Figure 11 CHECKING OF CRANKSHAFT
CHECKING THE CRANCKSHAFT END:

If any beyond-tolerance areas are found in terms of journal diameter, taper, width or out of round, this can be corrected by re-grinding on a dedicated crankshaft grinding machine. In order to correct journals, you’ll end up moving to an undersized (smaller diameter than original), in which case you can easily purchase a set of undersized-I.D. main and/or rod bearings



Just remember that bearing size needs to be uniform — if one main journal must be re-ground to then accept an under sized main bearing, then all of the main journals should be ground to that same size. The same holds true for rod bearings. If even only one rod journal needs to be undersized, then all rod journals need to be ground to the same diameter. Always check with your bearing supplier to first find out what undersize bearings are available (-0.0005- inch, –0.005-inch, –0.010-inch, –0.020-inch, etc.). This will determine the diameter of the re-grind.

CLEANING THE CRANKSHAFT:

  1. Clean the crankshaft with solvent.

  2. Thoroughly clean all oil passages and inspect for restrictions

  3. Dry the crankshaft with compressed air

  4. Perform a visual inspection of the crankshaft for damage.

  5. Inspect the crankshaft position reflector ring lobes for damage.

CLEANING PROCEDURE:





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