BOOM & BEARING AS 4838148 - Caterpillar

Illustration 2 g03778558
Front view
Table 2
Item Qty Part Specification Description
J - - The distance from the centerline of the crankshaft bearing bore to the top of the cylinder block is 946.0 mm (37.24 inch).
K - - Bore in cylinder block for main bearing is 265.00 0.02 mm (10.433 0.001 inch).
L - - The distance from the centerline of the crankshaft bearing bore to the bottom of the cylinder block is 405.0 mm (15.94 inch).
7 9 124-1836 Bearing Cap As The Bearing cap assembly must be installed with the part number toward the front of the block. The number of the main bearing cap must also match the cast number on the left side of each main bearing saddle.
Width in the cylinder block for the bearing cap assembly is 500.00 0.05 mm (19.685 0.002 inch).
Width (M) of bearing cap assembly is 499.95 0.03 mm (19.683 0.001 inch).
Protrusion of 6V-3538 Dowel from the bearing cap assembly is 10.0 0.5 mm (0.39 0.02 inch).
Illustration 3 g03778561
Front view
Table 3
Item Qty Part Specification Description
8 18 3S-7079 Bolt Use the following procedure in order to tighten the main bearing assembly:
1. Again, tighten taperlock stud (11) in the cylinder block to 100 20 N m (74 15 lb ft).
2. Assemble bearing cap assembly (7), washer (9), and hand tighten the nut (10).
3. Assemble all side bolt (8) on the tab slot side of the cap and hand tighten bolt (8). Before assembly, lubricate washer face and the threads of the bolts with clean engine oil.
4. Starting at front face of the block, tighten the side bolt (8) on the tab slot side of the cap to 215 40 N m (159 30 lb ft).
5. Starting at front face of the block, simultaneously tension each pair of taperlock stud (11) with either tensioner 207-5034 Stud Tensioner Tool Gp or tensioner 191-5320 Stud Tensioner Tool Gp. Apply 1415000 50000 N (318106 11240 lb) force for each stud. Hand tighten nut (10) and slowly release the pressure.
6. Repeat Step 5.
7. Repeat sequentially Step 5 through Step 6 for cap (2) through cap (9).
8. Assemble all side bolt (8) on the side opposite to the tab slot side of the cap and hand tighten bolt (8). Before assembly, lubricate washer face and threads of the bolts with clean engine oil.
9. Starting at front face of the block, tighten the side bolt (8) on the side opposite to the tab slot side of the cap to 215 40 N m (159 30 lb ft).
10. Starting at front face of the block, tighten the side bolt (8) on tab slot side of the cap to 1825 175 N m (1346 129 lb ft).
11. Starting at front face of the block, tighten the side bolt (8) on the side opposite to the tab slot side of the cap to 1825 175 N m (1346 129 lb ft).
9 18 1W-0122