COVER ASSEM. 4K4272 - Caterpillar

Start By:a. remove valve coversb. remove fuel injection lines 1. Use tool (A) to loosen the fuel injection line nut at the nozzle end. 2. Use tool (B) to loosen the nut at the fuel injection line adapter end. Remove inner fuel injection lines (1). Install plugs in the fuel injection nozzles. 3. Remove the nut that holds the adapters to the cylinder head assembly. Remove fuel injection line adapters (2). The following steps are for installation of the fuel injection line adapters.4. Check the condition of the O-ring seal on fuel injection line adapter (2) for damage. Make a replacement if necessary.5. Lubricate the O-ring seal with clean engine oil. Install fuel injection line adapter (2). Tighten the retaining nut to a torque of 13.6 2.7 N m (10 2 lb.ft.).6. Check the condition of the O-ring seal on inner fuel line (1) for damage, and make a replacement if necessary. Install inner fuel line (1).7. Use tooling (A) and (B) to tighten the inner fuel line nuts to a torque of 40 7 N m (30 5 lb.ft.).End By:a. install fuel injection linesb. install valve covers