Removal and installation of valve seat rings 01.8 352/352 A Removal Disassemble cylinder head, referring to 5.111. 2 Check valve guides and renew if necessary, re- ferring to 6.1/1. 4 Introduce pilot into valve guide until stop on slotted rod rests on valve guide. If necessary, force slotted rod downwards using screwdriver. Tighten with drift, inserting into pilot from above and below. 3 Clamp cylinder head in jig. 5 Clamp groove cutter in slide rest. 6 Release lock·nut (2). Moisten pilot with oil, slip cutter over pilot, turn screw (1, quick·action ad· justment) until tool contacts pilot and then slide cut· ter downwards until tool is located in center of valve seat ring.
7 Hold cutter at this position. Release locking screw (1) of pilot support, and press pilot support (2) downwards until it contacts pilot. Retighten lock· ing screw (1). 8 Turning hand crank,move steady bar to suitable position relative to work. Lock floating guide hori· zontally in roughly center of guide with aid of steadv clamp. Cutter must now turn just as smoothly as be· fore. UKD 30 40221 42-02 6.4/1