Posted on October 3, 2023 C3.3B Tier 4 Interim and EU Stage 3A Engines for Caterpillar Built Machines – Valve Mechanism Cover Illustration 1g02996856 (1) Valve Mechanism Cover Table 1 Tightening torque Valve cover bolts 9.81 to 11.2 N·m (7.24 to 8.31 lb ft)