1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 35Get this manual

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POLAR GAP TYPE 0 exrnal in ula torIf insu la tor is crackedreplace plu lT 2 Check depth of cen ter electrod as ho wn in Figurc 3 If electrode burned back more than 1 3:" (.8mm)replace plug3 Cra cks, w

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