RETAINER-BEARING 1T1281 - Caterpillar

3600 Family Of EnginesThe 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 and cause the crankshaft to deflect. This deflection can cause crankshaft and/or bearing failure.
The crankshaft deflection must be checked after the final installation of the engines. The check must be made with the engine cold. The procedure that follows can be used to check crankshaft deflection.
Checking Crankshaft Deflection (Bend)
1. Remove the inspection cover from the cylinder block for: connecting rod journal 3 for six cylinder engines. connecting rod journal 4 for eight cylinder engines. connecting rod journal 3 or 4 for twelve cylinder engines. connecting rod journal 4 or 5 for sixteen cylinder engines.2. Turn the crankshaft in the direction of normal rotation until the center of the counterweights just goes beyond the connecting rod.3. For 3606 and 3608 Engines, where the counterweight is not available on both sides, install a 2B7218 Bolt (1) with a 1B4333 or 2J3507 Nut (2) in the crankshaft. Tighten the nut against the crankshaft. The purpose of the bolt and nut is to provide a locating surface.
Location of bolt and nut.4. Install a Starrett Crankshaft Distortion Dial Gauge No. 696 with Starrett No. 696B Balancer Attachment between bolt (1) and the counterweight. Put the dial gauge within 10 mm (.39") of the end of the counterweight. Turn the dial of the indicator to align the zero with the pointer. Turn the indicator on its end points until the pointer of the indicator will not move from zero.5. Turn the crankshaft in the direction of normal rotation until the indicator almost makes contact with the connecting rod on the other side of the crankshaft. Do NOT let the indicator make contact with the connecting rod.6. The dial indicator reading must not change more than 0.040 mm (.0016") for the approximate 300° of crankshaft rotation. Now turn the crankshaft in the opposite direction to the starting position. The dial indicator must now read zero. If the dial indicator does not read zero, do the procedure again.If the dial indicator reads more than 0.040 mm (.0016"), the cylinder block is bent. Loosen the bolts that hold the engine mounting rails to the foundation mounting rails. Adjust the shims to make the engine straight again. Also check to see if the engine mounting bolts have enough clearance to let the engine expand as it gets hot.