BOLT-HEAD 4613881 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Evacuate as much fuel and oil as possible from the cylinder head before installing the electronic unit injector. Several evacuations may be necessary. Use Tooling (F) to remove the fuel and oil from the cylinder head.Note: Tooling (K) is available to clean loose material from the sleeve bore and the cylinder.
Inspect the electronic unit injector sleeve for damage and carbon deposits.
Clean the carbon from the sleeve, the sleeve bore, and the end of the electronic unit injector, if the electronic unit injector is being reused. Clean the carbon from the seat area that is inside of the cylinder head. A fine grade of Scotch Brite material is preferred. Use Tooling (G)