Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 373Get this manual
Oil Pump Volume (Flow) Test NOTE: The following specifications are determined with the outboard running off remote fuel upply with pre-mix
Engine Mounted Oil Reservoir
REMOVAL NOTE: If oil reservoir contains oil, the clear oil hose going to the oil pu mp should be plugged upon removal to prevent oil spillage1234Disconnect input oil hose to oil reservoirDisconnect LIGHT BLUE leads from their respective connectionsDisconnect clear input hose to oil pump and plug off hoseRemove three bolts securing oil reservoir to powerhead and remove reservoir
fuelThe oil pump output hose (clear) must be disconnected from the input fuel line TEE fittin and directed into graduated containerThe input fuel line TEE fitting from which the oil line was removed MUST BE CAPPED OFFto prevent fuel leakage while the engine is running