Refacing valve seats with valve seat cutter 01.8 352/352 A Refacing Disassemble cylinder head, referring to 5.1/1. 2 Check valve guides and exchange if necessary, referring to 6.1/1. 3 Clamp cylinder head in jig. 4 Check valve seat. Note: If valve seats show only slight traces of wear, they can be refaced without necessitating replace· ment of valve seat rings, provided they are not ma- chined below their bottom limit. See 1.2/4 for repair size. 5 Introduce pilot into valve guide so that stop of slotted rod rests on valve guide. If necessary, press slotted rod ~ownwards using screwdriver, and tighten pilot. 6 Fasten cutting tool to slide rest. Note:
Make sure that cutting tool is positioned cor· rectly on slide rest. Release coupling nut to stop free slide rest. Attach crank handle to arm marked 45 0 7 Release coupling nut (2), slip cutter over pilot and turn screw (1) until cutting tool is positioned in center of valve seat. 8 Press pilot support (1) downward onlo pilot, and clamp with screw (2), making sure that knurled ring (3) is screwed down and locking screw (4) is tight UKD 30 402 21 42-01 6.2/1