Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 194Get this manual
Oil Injection Operation Oil in this engine is not mixed with the fuel before entering the combustion chamberOil is stored inside the remote oil tankCrankcase pressure will force oil from the remote oil tank into the engine oil tank (g) on the side of the powerheadOil will flow from the engine oil tank through the oil supply hose (h) to the oil pump (i)The oil pump is solenoid design and is activated by the ECM, it includes seven oil discharge portsSix of the oil pump discharge ports discharge oil into the intake manifold (k) in front of the reed blocksThe oil passageways (j) are machined into the intake manifoldThe last oil pump discharge port discharges oil through hose (a) to the air compressor (f) for lubricationThe port and starboard side bleed systems (c and d) also supply oil to the air compressor for lubricationExcess oil from the compressor returns through hose (b) into the plenum and is ingested through the crankcaseThe ECM will change the discharge rate of the oil pump, depending upon engine demandThe ECM will also pulse the pump on initial start up to fill the oil passages eliminating the need to bleed the oil systemThe ECM will signal the oil pump to provide additional oil (50:1) for break in, as determined by the ECM's internal clock (90 minutes)After break-in, the oil ratio ranges from 300400:1 at idle to 60:1 at WOT