11-32. DISASSEMBLY, INSPECTION, AND ASSEM BLY. Figure 11-4 shows the relative position of the internal parts of the filter adapter and may be used a guide during installation of parts. The by- pass valve is to be installed as a complete unit, with the valve being staked three places. A new helio- type thread insert in the adapter may be installed although special tools are required. Follow instructions of the tool manufacturer for their use. Inspect threads on adapter and in engine for damage. Clean adapter in solvent and dry with compressed air Ascertain that all passages in the adapter are open and free of foreign material. Also, check that pass valve is seated properly 11-33. ADAPTER INSTALLATION Assemble adapter nut and new ring on adapter in sequence illustrated in figure 11 Lubricate o-ring on adapter with clean engine oil. Tighten adapter nut until O-ring is centered in