BONNET 4734847 - Caterpillar

Removal Procedure
Start By:
Remove the engine oil pump. Refer to Disassembly and Assembly, "Engine Oil Pump - Remove".
Remove the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Remove".
Remove the flywheel housing. Refer to Disassembly and Assembly, "Flywheel Housing - Remove and Install".
Remove the housing for the crankshaft rear seal. Refer to Disassembly and Assembly, "Crankshaft Rear Seal - Remove".
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00975296
Remove socket head bolts (1) from the bridge.
Remove bridge (2) from the cylinder block. Note: Make sure that the main bearing caps and the connecting rod caps are marked for the location and direction for installation.
Remove main bearing cap bolts (3).
Remove main bearing caps (4) from the cylinder block. Remove the bearings from the main bearing caps. Keep the main bearings with the respective main bearing cap.
Remove bolts (5) from the connecting rods. Note: Do Not reuse bolts (5). Use new bolts in order to secure the connecting rod cap for reassembly.
Remove connecting rod bearing caps (6) from the connecting rods. Remove the bearings from the connecting rod bearing caps. Keep the connecting rod bearings with the respective connecting rod bearing cap.
Do not allow the connecting rods to strike the piston cooling jets. Damage or misalignment may occur.
Push the piston assemblies into the cylinder bores.
Attach lifting straps and a suitable lifting device to the crankshaft. Lift the crankshaft out of the cylinder block. The weight of the crankshaft is approximately 32 kg (70 lb). Do not scratch any of the finished surfaces on the crankshaft.
Illustration 2 g00975313
Remove the upper main bearings (7). Remove the upper thrust washers from the center main bearing block. Keep the upper main bearings with the respective main bearing caps.
Illustration 3 g00975478
Remove lower main bearings (8) from main bearing caps (4). Remove the lower thrust washers from the center main bearing cap. Keep the lower main bearings with the respective main bearing cap.