CUP-BEARING 1B3937 - Caterpillar

Piston Rings
The pistons of the engine have a keystone design ring groove. The piston rings are a keystone ring. The 1U-6431 Piston Ring Groove Gauge is available to check the top ring groove in the piston. Use the 8T-3149 Plug Gauge that is part of this Gauge Group to check the top ring groove on the piston. Refer to the instruction card for correct use of the 1U-6431 Piston Ring Groove Gauge .Connecting Rod Bearings
The connecting rod bearings fit tightly in the bore in the rod. If the bearing joints are worn, check the bore size. This can be an indication of wear because of a loose fit. Connecting rod bearings are available with 0.508 mm (.0200 inch) and 0.762 mm (.0300 inch) smaller inside diameter than the original size bearings. These bearings are for crankshafts that have been ground.Main Bearings
Main bearings are available with 0.508 mm (.0200 inch) and a 0.762 mm (.0300 inch) smaller inside diameter than the original size bearings. These bearings are for crankshafts that have been ground.Main bearings are also available with a larger outside diameter than the original size bearings. These bearings are used for the cylinder blocks with the main bearing bore that is made larger than the bore's original size. The size that is available has a 0.508 mm (.0200 inch) outside diameter that is larger than the original size bearings.The Special Instruction, SMHS7606 gives the instructions for the use of 1P-4000 Line Boring Tool Group. The 1P-4000 Line Boring Tool Group is used in order to check the alignment of the main bearing bores. The 1P-3537 Dial Bore Gauge Group can be used to check the size of the bore. The Special Instruction, GMGO0981 gives the instructions for the use of 1P-3537 Dial Bore Gauge Group .Cylinder Block
Table 1
Tools Needed    
Part Number     Part Name     Quantity    
1P-3537     Dial Bore Gauge Group     1    
Illustration 1 g00285686
1P-3537 Dial Bore Gauge Group If the main bearing caps are installed without bearings, the bore in the block for the main bearings can be checked. Tighten the cap nuts to the torque that is shown in the Specifications, "Cylinder Block". Alignment error in the bores must not be more than 0.08 mm (.003 inch). The 1P-3537 Dial Bore Gauge Group can be used to check the size of the bores. The Special Instruction, GMGO0981 is with the group.Cylinder Liner Projection
Table 2
Tools Needed    
Part Number     Part Name     Quantity    
8T-0455     Liner Projection Tool Group     1    
Clean the cylinder liner flange and the cylinder block surface. Remove any nicks on the top of the cylinder block.
Table 3
Needed Components    
Item     Part Number     Description     Quantity for One Cylinder     Quantity for Six Cylinders    
1     8T-4193     Bolt