1.4 VALVES, SPRINGS, GUIDES, INSERTS, SEALS AND ROTATORS Valves are positioned and aligned by replaceable valve guides pressed into the cylinder head. See Figure 1-65. 1. Valve Guide 5. Valve Stem Oil Seal 2. Valve Spring Seat 6. Valve Spring 3. Valve Insert 7. Valve Rotator 4. Valve 8. Valve Keepers Figure 1-65 Valve Guide and Related Parts Replacement guides are reamed to close tolerances, and do not require reaming after installation. All valves are retained by valve rotator spring caps and two-piece tapered valve locks. (Rev. 2005) All information subject to change without notice. 1-80 6SE483 0507 Copyright © 2005 DETROIT DIESEL CORPORATION