Section 14 - Engine Testing - Group 14 Engine Storage - Long Term (14-08) M11 Page 14-57 Use clean diesel fuel to flush the preservative oil from the fuel system. After operating the engine to flush out the preservative oil, install a new fuel filter(s). Adjust the injector and valve clearance. Refer to Engine Assembly (0-02). Adjust the belt tension. Refer to Engine Assembly (0-02). Tighten the intake manifold cover capscrews. Tighten the exhaust manifold capscrews. Refer to Engine Assembly (0-02).