SEAL-O-RING 1407515 - Caterpillar

Remove & Install Fuel Injection Lines
FLUID SPILLAGE CONTAINMENTCare must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to "Tools And Shop Product Guide", NENG2500, for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose fluids according to local regulations and mandates.
When disassembling the engine for inspection or repair, the fuel lines should be removed as a unit and reinstalled as a unit. If any fuel lines are replaced, the fuel line clamps must be reinstalled in the exact locations as previously installed from the factory. The fuel line clamps are strategically placed to support the lines and prevent them from vibrating. Continual vibration could cause the fuel lines to crack.
Before removing any clamps, mark their location with tape, paint, marker or some other non-damaging method. This will help insure that the clamps are reinstalled in the correct location. Use a 4C-9738 Torque Screwdriver or similar tool to tighten the clamp screws to a torque of 2.25 N m (20 lb in). The proper torque is important so the fuel lines are held securely and in the proper alignment. Over torquing applies unnecessary pressure and can spread the lines apart.
1. Disconnect front fuel injection lines (1) and rear fuel injection lines (2) from the fuel injection pump and the cylinder head assembly.2. Remove fuel injection lines (1) and (2). Put caps and plugs on all fuel line connections to keep foreign material out of the fuel system. The following steps are for installation of the fuel injection lines.3. Remove the caps and plugs from the fuel injection line connections.4. Install front fuel injection lines (1) on the fuel injection pump and cylinder head assembly.5. Install rear fuel injection lines (2) on the fuel injection pump and the cylinder head assembly.6. Tighten the fuel injection line nuts to a torque of 42 7 N m (31 5 lb ft) with Tool (A).