181651 Volvo.Penta Bearing

Introduction
This Special Instruction provides the procedure in order to repower a 651B Wheel Tractor-Scraper. The replacement engine will be a Tier I 3408 Engine. The 651B was originally equipped with a D346 Engine. This Special Instruction will provide the information in order to install the Tier I level replacement engine. This Special Instruction does not include procedures that can be found in your existing manuals. Refer to the original Service Manual, Parts Manual, and Operation and Maintenance Manual for more information.When you have completed this procedure, prepare the machine for service. Refer to the Operation and Maintenance Manual.Note: Do not perform any procedure in this Special Instruction until the information has been read and understood.Reference: Service Manual, Parts Manual, Operation and Maintenance Manual.Safety
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Do not attempt to assemble this machine until you read and you understand the assembly instructions.Improper assembly procedures could result in injury or death.
Personal injury or death can result from improper lifting or blocking.When a hoist or jack is used to lift any part or component, stand clear of the area. Be sure the hoist or jack has the correct capacity to lift a component. Install blocks or stands before performance of any work under a heavy component.Approximate weights of the components are shown. Clean all surfaces where parts are to be installed.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Welding on Electronically Controlled Engines
Proper welding procedures are necessary in order to avoid damage to electronic controls. Perform welding on the engine according to the following procedure.
Set the engine control to the "STOP" mode.
Turn OFF the fuel supply to the engine.
Disconnect the negative terminal from the battery.
Disconnect the engine's electronic components from the wiring harnesses: ECM, throttle actuator, actuator for the turbocharger compressor's bypass, fuel metering valve and sensors.
Protect the wiring harnesses from welding debris and/or from welding spatter.
Do NOT use electrical components (ECM or ECM sensors) or electronic component grounding points for grounding the welder.
Connect the welder's ground cable directly to the engine component that will be welded. Place the clamp as close as possible to the weld in order to reduce the possibility of welding current damage to the engine bearings, to the electrical components, and to other engine components.
Use standard welding procedures to weld the materials together.3408 Engine Repower Arrangement
Table 1
234-2881 Engine Arrangement    
Part Number     Description    
1W-5010     Crankshaft Group    
4N-6866     Cover Group    
108-1547     Camshaft Group    
109-9009     Engine Cylinder Block Group    
125-9323     Block Plug Group    
192-8808     Piston and Rod Group    
107-7319     Engine Cylinder Head Group    
108-1551     Valve Mechanism Group    
125-9246     Valve Cover Group    
126-1336     Head Plug Group    
126-2267     Lifting Group    
4N-5893     Damper Group    
6N-3788     Pulley Group (Auxiliary)    
108-2796     Engine Support Group    
126-7280     Front Housing Group    
126-7281     Gear Group    
241-1061     Drive Group (Fan)    
242-7122     Cover Group    
4N-1092     Balancer Group    
4N-3825     Rear Housing Group    
7W-4380     Flywheel Housing Group    
8N-0953     Flywheel Group    
8N-2034     Rear Cover Group    
4N-8159     Cover Group    
6I-3744     Oil Pan Group