Johnson to Mariner swap

[Dave Turner]

I have a Jack plate mounted 1989 150 hp Johnson that is bad. I found a late 80's 75 hp Mariner that is for sale. What all is envolved in changing over to the Mariner as far as mounting, electrical and steering? Thanks very much.

 

[Charlie in TX]

Re: Johnson to Mariner swap

150hp down to 75hp, get a smaller boat. I can't imagine a boat that was properly powered by a 150 that could perform satisfactorily with a 75.

Mounting should be the same, steering depends, gauges and controls will need to be replaced.

 

[Dave Turner]

Re: Johnson to Mariner swap

The 75 will do just fine for where i will be fishing. I am not going to be in Texas to fish Toledo Bend or Sam Rayburn. I just needed to know what to change to get the motors switched.

 

[Chris1956]

Re: Johnson to Mariner swap

Mounting bolts might fit. Steering will fit. Fuel line is easily adaptable. Electric and shift and throttle cables and control are completely different. Gauges should work.

 

[TD_Maker]

Re: Johnson to Mariner swap

Hi Dave,

I just went the opposite way....Mercury to Johnson. Here is what I found.

* Control Box and cables are different, they will have to be changed.

* If you are using Teleflex or Morse standard steering, the cable will be the same; however, the Mercury/Mariner motor has a different sized nut on the tilt tube opposite of the steering cable nut. Easy find and easy fix.

* Since your 150 Johnson is not a "Systems Check" Motor, the old gauges should work fine with the Mercury/Mariner 75. You may have to change the settings on the back of your tach. Everything else can be retro-fitted.

* Mounting bolts (and hole pattern) will be the same.

* Fuel Line fitting (on the motor) is different.

Actually, the 75 Mariner will surprise you. It is a pretty gutsy litle motor.