Electronic Oil Injection
1989-1999 Mercury and Mariner V-6 EFI Models
Installation Instructions

Test the Oil Warning System per the applicable Mercury Service Manual and assure normal engine compression before beginning installation. Replace all defective and suspect parts, with original Mercury parts.  Installation requires resistor spark plugs such as NGK BUZ8H.

  Remove oil pump  
1.

Disconnect the 12V starting battery.

  
2.

Remove the oil lines and drain the engine reservoir tank.

  
3.

Remove the oil pump link rod.

 
4. Remove the oil pump, bearing assembly and driven gear from the crankcase.  
5. Clean and check that the oil pump rotates freely in a counter-clockwise direction.  
6. Clean and check that the magnet plug is recessed, that the bearing is not damaged, and that the outside diameter of the bearing is under.626 inch to avoid excess friction.  
 
 

Rotating magnet

Driven gear

  

 
7. Apply Loc-tite to the mounting screws and install the crankcase plug supplied.  
  Remove rotation sensor and oil warning module  
1.

Remove the rotation sensor assembly from the crankcase.

 

2.

Remove the oil warning module if mounted on the side of the block.

  
  Install link lever on the throttle cam  

1.

Remove the throttle cam from the engine.

2.

Clamp the link lever to the cam. Locate then drill (0.159" dia) and tap for the #10-32 mounting screw.

3.

Apply Loctite to the link lever screw and install securely with the lock washer supplied

4.

Reassemble the throttle cam to the engine and assure free rotation of the cam.

 


Crankcase plug installation


Link lever on throttle cam
   
  Install bearing assembly, oil pump and rotation sensor  

1.

Replace the o-ring on the bottom of the oil pump with the o-ring supplied.

2.

Install rotating magnet, oil pump, and rotation sensor to the coupler with original hardware

 


Oil pump and rotation sensor mounted on coupler

 
  Assemble the EOI mounting plate to the engine  

1.

Apply Loctite and install (3) studs into the crankcase with the short stud in the bottom boss. Tighten the 3/8 long hex spacers securely against the engine block.

2.

Assemble and hold the EOI mounting plate on the studs. Advance the throttle and check for spark advance lever clearance behind the mounting plate. Correct as necessary.

 

(3) bosses on side of crankcase

Check for trigger arm clearance
   

3.

Secure the mounting plate with (2) 3/8 inch hex spacers on the top studs and one hex nut on the bottom stud.

4.

Secure the oil warning module on the studs with (2) hex nuts and washers and the 1-1/4 inch screw, nylon spacer, washer and hex nut at the top of the mounting plate.

5.

Remove the rod end from the original link rod and assemble it to the new link rod.

6.

Connect and adjust the link rod to assure that the 1st mark on the pump arm is in aligned with the mark on the oil pump with the throttle at the idle position.

7.

Assure free movement of the oil pump link rod as the throttle is advanced. Note that the oil pump lever needs only to reach just over half the way between the 2nd and 3rd mark to assure full oil delivery at wide open throttle.

 


EOI mounted plate and oil warning module on crankcase

  Connect wiring  

1.

Route the rotation sensor wires behind the EOI electric motor.

2.

Reconnect the white rotation sensor wire to the oil warning module.

3.

Connect the blue/white rotation sensor and the boil warning module wires to the blue controller wire.

4.

Connect the black rotation sensor wire and black controller wire to the ground on the top of the crankcase.

5.

Connect the gray controller wire to the unused gray terminal and the 2nd voltage regulator. Or, use the gray jumper wire to tap into the tachometer wire on a single regulator system.

6.

Secure all wiring with the cable ties supplied.

  Install oil lines  

1.

Check that the 2 psi check valve opens between 1.5 and 2 psi. Replace if necessary.

2

Trim and install the new oil lines and clamps. Reposition the oil pump fittings as needed to assure clearance with the oil pump link rod and throttle linkage.

3.

Refill the oil reservoir and check for leaks.

  System test and start-up  

1.

Connect the red wire to the starter solenoid and reconnect the battery.

 

2.

Turn the ignition key to on and check for audible oil warning module signal. Do not deliver the engine to customer without an audible oil warning module signal.

  

3.

Start engine on 50:1 pre-mix fuel and oil and cooling water. Assure that the oil warning horn is not sounding. See the troubleshooting section if the horn is still sounding.

  

4.

 Disconnect the 3/16” oil pump output hose to bleed air from the pump and assure oil flow.  

5.

With the engine running, disconnect the blue-white rotation sensor wire and assure that the oil warning horn sounds. Reconnect the wire to stop the warning horn from sounding. Replace the oil warning module if the horn does not sound.

  

6.

Spray electric motor and pump with Quicksilver Corrosion Guard in salt water areas.

 

7.

Cut away the inner air duct on early model bucket cowls to clear the motor and pump.

 

8.

Deliver to customer and explain Operation and Maintenance Instructions.

 
 

Troubleshooting

  
The controller is not getting a good tachometer signal if the warning horn does not shut off after the outboard is started.

1.

Check for correct and secure wire connections.

2.

Check that the voltage regulator is providing a good tachometer signal by connecting it to the boats tachometer. Replace the voltage regulator if it does not properly drive the tachometer.

3.

Assure that all 6 spark plugs are NGK BUZ8H.

The controller is not getting a good rotation sensor signal if the warning horn comes on and stays on 10-15 seconds after the outboard is started.

1.

Check for correct and secure blue / blue-white rotation sensor wire connections.

2.

Check that the rotating magnet has been installed to drive the oil pump.

3.

Replace the rotation sensor.

The warning system may be malfunctioning if the warning horn does not shut off after the outboard is started
1. Remove the two oil pump mounting screws and lift the pump off of the coupler.  
2. Run the engine at idle on premix fuel and cooling water and watch the motion of the plastic bearing. If the bearing is turning slowly, the EOI system is OK.  
3. Hold the float switch on the engine oil reservoir cap against the cap. If the warning horn stops fill the tank with oil or repair or replace the float switch.  
4. Remove the green wire from the #4 ignition coil and connect it to the #2 or #6 coil. If the warning horn stops, replace the #4 coil.  
Note: Do not connect the black and red motor wires on the controller to 12V battery voltage. Don not make unauthorized changes. Call Marine Solutions for Advice.