undertaking 1200 hrly routine of 03 in nos obms at karwar , items description , service charges 1200 hrly routines of obm ( make : mercury , model : 250 efi ) of ics is to be carried out . 1200 hrly routine includes the following jobs:- ( i ) check and lubricate trim cylinders and rc cables . ( ii ) replace corrosion control anodes . ( iii ) replace fuel primer bulb . ( iv ) replace fuel pump ( v ) replace fuel lines ( vi ) replace upper & lower mounts ( vii ) replace reed block ( viii ) replace shift shaft bushing ( ix ) replace spark plug ( x ) replace spark plug boot ( ix ) replace throttle cam bushing ( x ) replace trim sender ( xi ) replace trim switch ( xii ) replace water pump assembly ( xiii ) service gear housing assembly ( xiv ) service water pressure regulator ( xv ) spray anti corrosion guard ( xvi ) clean & clear water intake & replace water pump assly ( xvii ) replace exhaust plate parts ( xviii ) overhaul power head ( xix ) service oil injection parts ( xx ) replace roller guide bushing ( xxi ) test bench load trials post servicing ( xxii ) service c / r gear housing ( xxiii ) service std gear housing ( xxiv ) service emergency parts / maintenance required parts ( spare cg supply )