CYL GP- 4915804 - Caterpillar

(A) Undercut Hex. (B) Collar.New fuel line support brackets are used on engines that do not include aftercoolers. On 3408 engines these are the 4P8261 and 4P8385 Brackets. On 3412 engines this is the 6I0348 Bracket.
Before removing any clamps, mark their location with tape or some other non-damaging method. This will help insure that the clamps are reinstalled in the correct locations. Use a 6V6069 Torque Screwdriver or similar tool to tighten the clamp screws to a torque of 2.25 N m (20 lb in). Do not force fuel injection line ends into position and then begin to tighten the nuts on the ends of the lines. The result will be added strain on the lines. If needed, gently bend the lines by hand until the lines are the correct shape for the nuts to be easily started. Before tighten the nuts on the ends of the fuel injection lines, use the fuel priming pump to purge air from the fuel system. Tighten the fuel injection line nuts to a torque of 40 7 N m (30 5 lb ft). After starting the engine and checking for leaks, tighten the fuel injection line nuts again to a torque of 40 7 N m (30 5 lb ft).