TUBE AS 8W9005 - Caterpillar

The crankshaft can be deflected (bent) if the installation of the engine is not correct. If the engine mounting rails are not fastened correctly to the foundation mounting rails, the cylinder block can twist or bend. The crankshaft to can deflect. This deflection can cause crankshaft and/or bearing failure.The crankshaft deflection must be checked after the final installation of the engine.For engines that drive equipment from the rear, the deflection must be checked at the connecting rod journals that are listed in Table 1:
Table 1
Number of Engine Cylinders     Cylinder Journal to Check    
6 Cylinder     3 and 6    
8 Cylinder     4 and 8    
12 Cylinder     5 and 6, 11 and 12    
16 Cylinder     7 and 8, 15 and 16    For engines that drive equipment from the front, the deflection must be checked at the connecting rod journals that are listed in Table 2:
Table 2
Number of Engine Cylinders     Cylinder Journal to Check    
6 Cylinder     4 and 1    
8Cylinder     5 and 1    
12 Cylinder     5 and 6, 1 and 2    
16 Cylinder     7 and 8, 1 and 2    
Illustration 1 g00605226
(1) Bolt (2) Nut (3) Dial gauge
Remove the appropriate inspection cover from the cylinder block.
Turn the crankshaft in the direction of normal rotation until the center of the counterweights barely go beyond the connecting rod.
For engines with six and eight cylinders, install a 2B-7218 Bolt with a 1B-4333 Nut or 2J-3507 Full Nut in the crankshaft. Tighten the nut against the crankshaft. The bolt and the nut are used to provide a locating face.
Install a Starrett Crankshaft Distortion Dial Gauge No. 696 and a Starrett No. 696B between the bolt and the counterweight. Put the dial indicator within 10 mm (0.39 inch) of the end of the counterweight. Turn the dial of the dial indicator