1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 494Get this manual

1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 494

CYLINDER BLOCK OIL FILTER BY-PASS VALVE INS PECTION end REPLAC EMENT With oi filter rem oved, check spring and fibre valve
bores several time with li"ht gine oil and cl an cloth, th en wipe with clea dry clothC YLIND ER BORING 1Before us in" any
ty pe bor in barfi le off op of cy inder bloc to remove dirt or burrsTh is is 'ery importan to pre enl boring bar tilt and
result that bored cylinder wall is not at ri ht ngles to crankshaft2:Ieasure piston lo be fitted wi microme er measuring
ce nter pis on skir and at right angles to piston pi.n ore !lnd to sa me di me te as pi stan nd 011 gi ve spec'ifi clearan
ce ,V OTE: Hone cylinders as outlined under "C ylinder Honing an.d Piston Fitting" 3Carefull: ob erve instructions furnished
by manufacturer of equipment being used Figure 15 Oil Filter By-Pass Valve CL EANI NG and INSPECT ION 1Remove all engin components
as prc ' iously outlined2'a jnder bl ck thoroughly in cleaning solvent and an ll gaskeL su rf ces 3Rem ove oil ga lle ry